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0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary Link--external" target="_blank" data-analytics-event="{"location":"navbar","action":"github_skills","context":"product","tag":"link","label":"github_skills_link_product_navbar"}" href="https://skills.github.com"> GitHub Skills <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 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</div> </modal-dialog></div> </div> <div data-action="click:qbsearch-input#retract" class="dark-backdrop position-fixed" hidden data-target="qbsearch-input.darkBackdrop"></div> <div class="color-fg-default"> <dialog-helper> <dialog data-target="qbsearch-input.feedbackDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="feedback-dialog" aria-modal="true" aria-labelledby="feedback-dialog-title" aria-describedby="feedback-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="feedback-dialog-title"> Provide feedback </h1> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="feedback-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button 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seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button form="code-search-feedback-form" data-action="click:qbsearch-input#submitFeedback" type="submit" data-view-component="true" class="btn-primary btn"> Submit feedback </button> </div> </dialog></dialog-helper> <custom-scopes data-target="qbsearch-input.customScopesManager"> <dialog-helper> <dialog data-target="custom-scopes.customScopesModalDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="custom-scopes-dialog" aria-modal="true" aria-labelledby="custom-scopes-dialog-title" aria-describedby="custom-scopes-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header Overlay-header--divided"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="custom-scopes-dialog-title"> Saved searches </h1> <h2 id="custom-scopes-dialog-description" class="Overlay-description">Use saved searches to filter your results more quickly</h2> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="custom-scopes-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" 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0l-5.25 1.68a.25.25 0 0 0-.174.238V7c0 1.358.275 2.666 1.057 3.86.784 1.194 2.121 2.34 4.366 3.297a.196.196 0 0 0 .154 0c2.245-.956 3.582-2.104 4.366-3.298C13.225 9.666 13.5 8.36 13.5 7V3.48a.251.251 0 0 0-.174-.237l-5.25-1.68ZM8.75 4.75v3a.75.75 0 0 1-1.5 0v-3a.75.75 0 0 1 1.5 0ZM9 10.5a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> </span> <span data-view-component="true" class="ActionListItem-label"> Security </span> </a> </li> <li hidden="hidden" data-menu-item="i6insights-tab" data-targets="action-list.items" role="none" data-view-component="true" class="ActionListItem"> <a tabindex="-1" id="item-aef15357-3c43-4a9e-ad5f-8e2a1baae6dc" href="/Outblock/flow-swift/pulse" role="menuitem" data-view-component="true" class="ActionListContent ActionListContent--visual16"> <span class="ActionListItem-visual ActionListItem-visual--leading"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-graph"> <path d="M1.5 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src=\"https://raw.githubusercontent.com/Outblock/flow-swift/main/Resources/logo.svg\" alt=\"Logo\" width=\"600\" height=\"auto\" style=\"max-width: 100%;\"\u003e\n \u003c/a\u003e\n \u003cp align=\"center\" dir=\"auto\"\u003e \u003cbr\u003e\n \u003ca href=\"https://github.com/Outblock/flow-swift\"\u003e\u003cstrong\u003eView on GitHub Β»\u003c/strong\u003e\u003c/a\u003e \u003cbr\u003e\u003cbr\u003e\n \u003ca href=\"https://Outblock.github.io/flow-swift\" rel=\"nofollow\"\u003eSDK Specifications\u003c/a\u003e Β·\n \u003ca href=\"/Outblock/flow-swift/blob/main\"\u003eContribute\u003c/a\u003e Β·\n \u003ca href=\"/Outblock/flow-swift/blob/main\"\u003eReport a Bug\u003c/a\u003e\n \u003c/p\u003e\n\u003c/div\u003e\n\u003cbr\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOverview\u003c/h2\u003e\u003ca id=\"user-content-overview\" class=\"anchor\" aria-label=\"Permalink: Overview\" href=\"#overview\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis reference documents all the methods available in the SDK, and explains in detail how these methods work.\nSDKs are open source, and you can use them according to the licence.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe library client specifications can be found here:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://outblock.github.io/flow-swift/\" rel=\"nofollow\"\u003ehttps://outblock.github.io/flow-swift/\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGetting Started\u003c/h2\u003e\u003ca id=\"user-content-getting-started\" class=\"anchor\" aria-label=\"Permalink: Getting Started\" href=\"#getting-started\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eInstalling\u003c/h3\u003e\u003ca id=\"user-content-installing\" class=\"anchor\" aria-label=\"Permalink: Installing\" href=\"#installing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis is a Swift Package, and can be installed via Xcode with the URL of this repository:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\".package(name: \u0026quot;Flow\u0026quot;, url: \u0026quot;https://github.com/outblock/flow-swift.git\u0026quot;, from: \u0026quot;0.4.0\u0026quot;)\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-k\"\u003epackage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003ename\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e url\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003ehttps://github.com/outblock/flow-swift.git\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e from\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0.4.0\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eConfig\u003c/h2\u003e\u003ca id=\"user-content-config\" class=\"anchor\" aria-label=\"Permalink: Config\" href=\"#config\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe library uses gRPC to communicate with the access nodes and it must be configured with correct access node API URL.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eAccess API URLs\u003c/strong\u003e can be found \u003ca href=\"https://docs.onflow.org/access-api/#flow-access-node-endpoints\" rel=\"nofollow\"\u003ehere\u003c/a\u003e. An error will be returned if the host is unreachable.\nThe Access Nodes APIs hosted by DapperLabs are accessible at:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eTestnet \u003ccode\u003eaccess.devnet.nodes.onflow.org:9000\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003eMainnet \u003ccode\u003eaccess.mainnet.nodes.onflow.org:9000\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003eLocal Emulator \u003ccode\u003e127.0.0.1:3569\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eTo config the SDK, you just need to provider the chainID for it. The default chainID is \u003cstrong\u003eMainnet\u003c/strong\u003e.\nFor example, if you want to use testnet, you can config the chainID like this:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"flow.configure(chainID: .testnet)\"\u003e\u003cpre\u003eflow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003econfigure\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003echainID\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003etestnet\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMoreover, if you want to use a custom gRPC endpoint for the access API, here is the way to do it:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let endpoint = Flow.ChainID.Endpoint(node: \u0026quot;flow-testnet.g.alchemy.com\u0026quot;, port: 443)\nlet chainID = Flow.ChainID.custom(name: \u0026quot;Alchemy-Testnet\u0026quot;, endpoint:endpoint)\nflow.configure(chainID: chainID)\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eendpoint\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003eChainID\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eEndpoint\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003enode\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eflow-testnet.g.alchemy.com\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e port\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e443\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003echainID\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003eChainID\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecustom\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003ename\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eAlchemy-Testnet\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e endpoint\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003eendpoint\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\nflow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003econfigure\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003echainID\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e chainID\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e(Optional) GRPC Acces Node\u003c/h3\u003e\u003ca id=\"user-content-optional-grpc-acces-node\" class=\"anchor\" aria-label=\"Permalink: (Optional) GRPC Acces Node\" href=\"#optional-grpc-acces-node\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf you want to use g-RPC access client better than HTTP client, please import this repo instead:\n\u003ca href=\"https://github.com/Outblock/flow-swift-gRPC\"\u003eflow-swift-gRPC\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHere is the example how you initialize it:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let accessAPI = Flow.GRPCAccessAPI(chainID: .mainnet)!\nlet chainID = Flow.ChainID.mainnet\nflow.configure(chainID: chainID, accessAPI: accessAPI)\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaccessAPI\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eGRPCAccessAPI\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003echainID\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003emainnet\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e!\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003echainID\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003eChainID\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003emainnet\nflow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003econfigure\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003echainID\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e chainID\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e accessAPI\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e accessAPI\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eQuerying the Flow Network\u003c/h2\u003e\u003ca id=\"user-content-querying-the-flow-network\" class=\"anchor\" aria-label=\"Permalink: Querying the Flow Network\" href=\"#querying-the-flow-network\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAfter you have established a connection with an access node, you can query the Flow network to retrieve data about blocks, accounts, events and transactions. We will explore how to retrieve each of these entities in the sections below.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGet Blocks\u003c/h3\u003e\u003ca id=\"user-content-get-blocks\" class=\"anchor\" aria-label=\"Permalink: Get Blocks\" href=\"#get-blocks\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eQuery the network for block by id, height or get the latest block.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eBlock ID\u003c/strong\u003e is SHA3-256 hash of the entire block payload. This hash is stored as an ID field on any block response object (ie. response from \u003ccode\u003eGetLatestBlock\u003c/code\u003e).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eBlock height\u003c/strong\u003e expresses the height of the block on the chain. The latest block height increases by one for every valid block produced.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExamples\u003c/h4\u003e\u003ca id=\"user-content-examples\" class=\"anchor\" aria-label=\"Permalink: Examples\" href=\"#examples\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis example depicts ways to get the latest block as well as any other block by height or ID:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let result = try await flow.getLatestBlock(sealed: true)\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003egetLatestBlock\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003esealed\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGet Account\u003c/h3\u003e\u003ca id=\"user-content-get-account\" class=\"anchor\" aria-label=\"Permalink: Get Account\" href=\"#get-account\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eRetrieve any account from Flow network's latest block or from a specified block height.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eAccount address\u003c/strong\u003e is a unique account identifier. Be mindful about the \u003ccode\u003e0x\u003c/code\u003e prefix, you should use the prefix as a default representation but be careful and safely handle user inputs without the prefix.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAn account includes the following data:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAddress: the account address.\u003c/li\u003e\n\u003cli\u003eBalance: balance of the account.\u003c/li\u003e\n\u003cli\u003eContracts: list of contracts deployed to the account.\u003c/li\u003e\n\u003cli\u003eKeys: list of keys associated with the account.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExamples\u003c/h4\u003e\u003ca id=\"user-content-examples-1\" class=\"anchor\" aria-label=\"Permalink: Examples\" href=\"#examples-1\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eExample depicts ways to get an account at the latest block and at a specific block height:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let address = Flow.Address(hex: \u0026quot;0x1\u0026quot;)\n\n// Handle Success Result\nlet result = try await flow.getAccountAtLatestBlock(address: address)\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaddress\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eAddress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003ehex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\n// Handle Success Result\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003egetAccountAtLatestBlock\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e address\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGet Transactions\u003c/h3\u003e\u003ca id=\"user-content-get-transactions\" class=\"anchor\" aria-label=\"Permalink: Get Transactions\" href=\"#get-transactions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eRetrieve transactions from the network by providing a transaction ID. After a transaction has been submitted, you can also get the transaction result to check the status.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eTransaction ID\u003c/strong\u003e is a hash of the encoded transaction payload and can be calculated before submitting the transaction to the network.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cg-emoji class=\"g-emoji\" alias=\"warning\"\u003eβ οΈ\u003c/g-emoji\u003e The transaction ID provided must be from the current spork.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eTransaction status\u003c/strong\u003e represents the state of transaction in the blockchain. Status can change until is finali\n.\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eStatus\u003c/th\u003e\n\u003cth\u003eFinal\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eUNKNOWN\u003c/td\u003e\n\u003ctd\u003eβ\u003c/td\u003e\n\u003ctd\u003eThe transaction has not yet been seen by the network\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePENDING\u003c/td\u003e\n\u003ctd\u003eβ\u003c/td\u003e\n\u003ctd\u003eThe transaction has not yet been included in a block\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFINALIZED\u003c/td\u003e\n\u003ctd\u003eβ\u003c/td\u003e\n\u003ctd\u003eThe transaction has been included in a block\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEXECUTED\u003c/td\u003e\n\u003ctd\u003eβ\u003c/td\u003e\n\u003ctd\u003eThe transaction has been executed but the result has not yet been sealed\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSEALED\u003c/td\u003e\n\u003ctd\u003eβ \u003c/td\u003e\n\u003ctd\u003eThe transaction has been executed and the result is sealed in a block\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEXPIRED\u003c/td\u003e\n\u003ctd\u003eβ \u003c/td\u003e\n\u003ctd\u003eThe transaction reference block is outdated before being executed\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let id = Flow.ID(hex: \u0026quot;0x1\u0026quot;)\nlet result = try await flow.getTransactionById(id: id)\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eid\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eID\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003ehex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003egetTransactionById\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eid\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e id\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGet Events\u003c/h3\u003e\u003ca id=\"user-content-get-events\" class=\"anchor\" aria-label=\"Permalink: Get Events\" href=\"#get-events\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eRetrieve events by a given type in a specified block height range or through a list of block IDs.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eEvent type\u003c/strong\u003e is a string that follow a standard format:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"A.{contract address}.{contract name}.{event name}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eA.{contract address}.{contract name}.{event name}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePlease read more about \u003ca href=\"https://docs.onflow.org/core-contracts/flow-token/\" rel=\"nofollow\"\u003eevents in the documentation\u003c/a\u003e. The exception to this standard are\ncore events, and you should read more about them in \u003ca href=\"https://docs.onflow.org/cadence/language/core-events/\" rel=\"nofollow\"\u003ethis document\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eBlock height range\u003c/strong\u003e expresses the height of the start and end block in the chain.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExamples\u003c/h4\u003e\u003ca id=\"user-content-examples-2\" class=\"anchor\" aria-label=\"Permalink: Examples\" href=\"#examples-2\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eExample depicts ways to get events within block range or by block IDs:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let eventName = \u0026quot;A.{contract address}.{contract name}.{event name}\u0026quot;\nlet blockIds: [Flow.ID] = [.init(hex: \u0026quot;0x1\u0026quot;), .init(hex: \u0026quot;0x2\u0026quot;) ]\nlet result = try await flow.getEventsForHeightRange(type: eventName, range: 10...20)\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eeventName\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eA.{contract address}.{contract name}.{event name}\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eblockIds\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003eID\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003einit\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003ehex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003einit\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003ehex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x2\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003egetEventsForHeightRange\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003etype\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e eventName\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e range\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e...\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e20\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGet Collections\u003c/h3\u003e\u003ca id=\"user-content-get-collections\" class=\"anchor\" aria-label=\"Permalink: Get Collections\" href=\"#get-collections\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eRetrieve a batch of transactions that have been included in the same block, known as \u003cem\u003e\u003cstrong\u003ecollections\u003c/strong\u003e\u003c/em\u003e.\nCollections are used to improve consensus throughput by increasing the number of transactions per block and they act as a link between a block and a transaction.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eCollection ID\u003c/strong\u003e is SHA3-256 hash of the collection payload.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eExample retrieving a collection:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let id = Flow.ID(hex: \u0026quot;0x1\u0026quot;)\nlet result = try await flow.getCollectionById(id: id)\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eid\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eID\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003ehex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003egetCollectionById\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eid\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e id\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExecute Scripts\u003c/h3\u003e\u003ca id=\"user-content-execute-scripts\" class=\"anchor\" aria-label=\"Permalink: Execute Scripts\" href=\"#execute-scripts\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eScripts allow you to write arbitrary non-mutating Cadence code on the Flow blockchain and return data. You can learn more about \u003ca href=\"https://docs.onflow.org/cadence/language/\" rel=\"nofollow\"\u003eCadence and scripts here\u003c/a\u003e, but we are now only interested in executing the script code and getting back the data.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWe can execute a script using the latest state of the Flow blockchain or we can choose to execute the script at a specific time in history defined by a block height or block ID.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eBlock ID\u003c/strong\u003e is SHA3-256 hash of the entire block payload, but you can get that value from the block response properties.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eBlock height\u003c/strong\u003e expresses the height of the block in the chain.\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"// simple script\npub fun main(a: Int): Int {\n return a + 10\n}\n// complex script\npub struct User {\n pub var balance: UFix64\n pub var address: Address\n pub var name: String\n\n init(name: String, address: Address, balance: UFix64) {\n self.name = name\n self.address = address\n self.balance = balance\n }\n}\n\npub fun main(name: String): User {\n return User(\n name: name,\n address: 0x1,\n balance: 10.0\n )\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e// simple script\npub fun main(a: Int): Int {\n return a + 10\n}\n// complex script\npub struct User {\n pub var balance: UFix64\n pub var address: Address\n pub var name: String\n\n init(name: String, address: Address, balance: UFix64) {\n self.name = name\n self.address = address\n self.balance = balance\n }\n}\n\npub fun main(name: String): User {\n return User(\n name: name,\n address: 0x1,\n balance: 10.0\n )\n}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"struct User: Codable {\n let balance: Double\n let address: String\n let name: String\n}\n\nlet result = try await flow.executeScriptAtLatestBlock(script: script, arguments: [.init(value: .string(\u0026quot;test\u0026quot;))])\nlet model: User = try result.decode()\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003estruct\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eUser\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eCodable\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003ebalance\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eDouble\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003eaddress\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-c1\"\u003ename\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eexecuteScriptAtLatestBlock\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003escript\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e script\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e arguments\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003einit\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003evalue\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003estring\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003etest\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emodel\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eUser\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e result\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003edecode\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMutate Flow Network\u003c/h2\u003e\u003ca id=\"user-content-mutate-flow-network\" class=\"anchor\" aria-label=\"Permalink: Mutate Flow Network\" href=\"#mutate-flow-network\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFlow, like most blockchains, allows anybody to submit a transaction that mutates the shared global chain state. A transaction is an object that holds a payload, which describes the state mutation, and one or more authorizations that permit the transaction to mutate the state owned by specific accounts.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTransaction data is composed and signed with help of the SDK. The signed payload of transaction then gets submitted to the access node API. If a transaction is invalid or the correct number of authorizing signatures are not provided, it gets rejected.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eExecuting a transaction requires couple of steps:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#build-transactions\"\u003eBuilding a transaction\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#sign-transactions\"\u003eSigning a transaction\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#send-transactions\"\u003eSending a transaction\u003c/a\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTransactions\u003c/h2\u003e\u003ca id=\"user-content-transactions\" class=\"anchor\" aria-label=\"Permalink: Transactions\" href=\"#transactions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA transaction is nothing more than a signed set of data that includes script code which are instructions on how to mutate the network state and properties that define and limit it's execution. All these properties are explained bellow.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eScript\u003c/strong\u003e field is the portion of the transaction that describes the state mutation logic. On Flow, transaction logic is written in \u003ca href=\"https://docs.onflow.org/cadence/\" rel=\"nofollow\"\u003eCadence\u003c/a\u003e. Here is an example transaction script:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"transaction(greeting: String) {\n execute {\n log(greeting.concat(\u0026quot;, World!\u0026quot;))\n }\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003etransaction(greeting: String) {\n execute {\n log(greeting.concat(\", World!\"))\n }\n}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eArguments\u003c/strong\u003e. A transaction can accept zero or more arguments that are passed into the Cadence script. The arguments on the transaction must match the number and order declared in the Cadence script. Sample script from above accepts a single \u003ccode\u003eString\u003c/code\u003e argument.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003e\u003ca href=\"https://docs.onflow.org/concepts/transaction-signing/#proposal-key\" rel=\"nofollow\"\u003eProposal key\u003c/a\u003e\u003c/strong\u003e must be provided to act as a sequence number and prevent reply and other potential attacks.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eEach account key maintains a separate transaction sequence counter; the key that lends its sequence number to a transaction is called the proposal key.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA proposal key contains three fields:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAccount address\u003c/li\u003e\n\u003cli\u003eKey index\u003c/li\u003e\n\u003cli\u003eSequence number\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eA transaction is only valid if its declared sequence number matches the current on-chain sequence number for that key. The sequence number increments by one after the transaction is executed.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003e\u003ca href=\"https://docs.onflow.org/concepts/transaction-signing/#signer-roles\" rel=\"nofollow\"\u003ePayer\u003c/a\u003e\u003c/strong\u003e is the account that pays the fees for the transaction. A transaction must specify exactly one payer. The payer is only responsible for paying the network and gas fees; the transaction is not authorized to access resources or code stored in the payer account.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003e\u003ca href=\"https://docs.onflow.org/concepts/transaction-signing/#signer-roles\" rel=\"nofollow\"\u003eAuthorizers\u003c/a\u003e\u003c/strong\u003e are accounts that authorize a transaction to read and mutate their resources. A transaction can specify zero or more authorizers, depending on how many accounts the transaction needs to access.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe number of authorizers on the transaction must match the number of AuthAccount parameters declared in the prepare statement of the Cadence script.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eExample transaction with multiple authorizers:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"transaction {\n prepare(authorizer1: AuthAccount, authorizer2: AuthAccount) { }\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003etransaction {\n prepare(authorizer1: AuthAccount, authorizer2: AuthAccount) { }\n}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eGas limit\u003c/strong\u003e is the limit on the amount of computation a transaction requires, and it will abort if it exceeds its gas limit.\nCadence uses metering to measure the number of operations per transaction. You can read more about it in the \u003ca href=\"/Outblock/flow-swift/blob/main/cadence\"\u003eCadence documentation\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe gas limit depends on the complexity of the transaction script. Until dedicated gas estimation tooling exists, it's best to use the emulator to test complex transactions and determine a safe limit.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eπ \u003cstrong\u003eReference block\u003c/strong\u003e specifies an expiration window (measured in blocks) during which a transaction is considered valid by the network.\nA transaction will be rejected if it is submitted past its expiry block. Flow calculates transaction expiry using the \u003cem\u003ereference block\u003c/em\u003e field on a transaction.\nA transaction expires after \u003ccode\u003e600\u003c/code\u003e blocks are committed on top of the reference block, which takes about 10 minutes at average Mainnet block rates.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuild Transactions\u003c/h3\u003e\u003ca id=\"user-content-build-transactions\" class=\"anchor\" aria-label=\"Permalink: Build Transactions\" href=\"#build-transactions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBuilding a transaction involves setting the required properties explained above and producing a transaction object.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHere we define a simple transaction script that will be used to execute on the network and serve as a good learning example.\nQuick example of building a transaction:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let address = Flow.Address(hex: \u0026quot;0x1\u0026quot;)\nvar unsignedTx = try! flow.buildTransaction{\n cadence {\n \u0026quot;\u0026quot;\u0026quot;\n transaction(greeting: String) {\n\n let guest: Address\n\n prepare(authorizer: AuthAccount) {\n self.guest = authorizer.address\n }\n\n execute {\n log(greeting.concat(\u0026quot;,\u0026quot;).concat(guest.toString()))\n }\n }\n \u0026quot;\u0026quot;\u0026quot;\n }\n\n proposer { \n // SequenceNumber is optional. If it's nil, it will fetch the updated one from the chain.\n Flow.TransactionProposalKey(address: address, keyIndex: 1)\n \n // If you are using the key 0, you can just pass the address \n // address\n }\n\n authorizers {\n address\n }\n\n arguments {\n [.string(\u0026quot;Hello Flow!\u0026quot;)]\n }\n \n // If payer is the same as proposer, you can ignore this field\n payer {\n address\n }\n\n // optional\n gasLimit {\n 1000\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaddress\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eAddress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003ehex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003evar\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eunsignedTx\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e!\u003c/span\u003e\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ebuildTransaction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003ecadence\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"\"\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e transaction(greeting: String) {\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e let guest: Address\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e prepare(authorizer: AuthAccount) {\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e self.guest = authorizer.address\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e execute {\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e log(greeting.concat(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e,\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e).concat(guest.toString()))\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e \u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\"\"\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eproposer\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \n // SequenceNumber is optional. If it's nil, it will fetch the updated one from the chain.\n \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eTransactionProposalKey\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e address\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \n // If you are using the key 0, you can just pass the address \n // address\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eauthorizers\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n address\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003earguments\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003estring\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eHello Flow!\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \n // If payer is the same as proposer, you can ignore this field\n \u003cspan class=\"pl-en\"\u003epayer\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n address\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n // optional\n \u003cspan class=\"pl-en\"\u003egasLimit\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003e1000\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAfter you have successfully \u003ca href=\"#build-transactions\"\u003ebuilt a transaction\u003c/a\u003e the next step in the process is to sign it.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSign Transactions\u003c/h3\u003e\u003ca id=\"user-content-sign-transactions\" class=\"anchor\" aria-label=\"Permalink: Sign Transactions\" href=\"#sign-transactions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFlow introduces new concepts that allow for more flexibility when creating and signing transactions.\nBefore trying the examples below, we recommend that you read through the \u003ca href=\"https://docs.onflow.org/concepts/accounts-and-keys/\" rel=\"nofollow\"\u003etransaction signature documentation\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAfter you have successfully \u003ca href=\"#build-transactions\"\u003ebuilt a transaction\u003c/a\u003e the next step in the process is to sign it. Flow transactions have envelope and payload signatures, and you should learn about each in the \u003ca href=\"https://docs.onflow.org/concepts/accounts-and-keys/#anatomy-of-a-transaction\" rel=\"nofollow\"\u003esignature documentation\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSignatures can be generated more securely using keys stored in a hardware device such as an \u003ca href=\"https://en.wikipedia.org/wiki/Hardware_security_module\" rel=\"nofollow\"\u003eHSM\u003c/a\u003e. The \u003ccode\u003ecrypto.Signer\u003c/code\u003e interface is intended to be flexible enough to support a variety of signer implementations and is not limited to in-memory implementations.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo sign the transaction, you need create a list signer which confirm \u003cstrong\u003eFlowSigner\u003c/strong\u003e protocol.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"public protocol FlowSigner {\n var address: Flow.Address { get set }\n var keyIndex: Int { get set }\n func signature(transaction: Flow.Transaction, signableData: Data) async throws -\u0026gt; Data\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epublic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eprotocol\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlowSigner\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-k\"\u003evar\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eaddress\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003eAddress\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eget\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eset\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-k\"\u003evar\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ekeyIndex\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eInt\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eget\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eset\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003efunc\u003c/span\u003e signature\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003etransaction\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003eTransaction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e signableData\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eData\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-k\"\u003easync\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ethrows\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e-\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eData\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFlow supports great flexibility when it comes to transaction signing, we can define multiple authorizers (multi-sig transactions) and have different payer account than proposer. We will explore advanced signing scenarios bellow.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ca href=\"https://docs.onflow.org/concepts/transaction-signing/#single-party-single-signature\" rel=\"nofollow\"\u003eSingle party, single signature\u003c/a\u003e\u003c/h3\u003e\u003ca id=\"user-content-single-party-single-signature\" class=\"anchor\" aria-label=\"Permalink: Single party, single signature\" href=\"#single-party-single-signature\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eProposer, payer and authorizer are the same account (\u003ccode\u003e0x01\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eOnly the envelope must be signed.\u003c/li\u003e\n\u003cli\u003eProposal key must have full signing weight.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAccount\u003c/th\u003e\n\u003cth\u003eKey ID\u003c/th\u003e\n\u003cth\u003eWeight\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003e0x01\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e1\u003c/td\u003e\n\u003ctd\u003e1.0\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let address = Flow.Address(\u0026quot;0x1\u0026quot;)\nlet signers = [YourSigner(address: address, keyIndex: 1)]\ndo {\n var unsignedTx = try await flow.buildTransaction{\n cadence {\n \u0026quot;\u0026quot;\u0026quot;\n transaction { \n prepare(signer: AuthAccount) { log(signer.address) }\n }\n \u0026quot;\u0026quot;\u0026quot;\n }\n\n proposer {\n Flow.TransactionProposalKey(address: address, keyIndex: 1)\n }\n\n authorizers {\n address\n }\n }\n let signedTx = try await unsignedTx.sign(signers: signers)\n} catch {\n // Handle Error\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaddress\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eAddress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esigners\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eYourSigner\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e address\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003edo\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003evar\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eunsignedTx\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ebuildTransaction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003ecadence\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"\"\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e transaction { \u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e prepare(signer: AuthAccount) { log(signer.address) }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e \u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\"\"\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eproposer\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eTransactionProposalKey\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e address\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eauthorizers\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n address\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esignedTx\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e unsignedTx\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003esign\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003esigners\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e signers\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n // Handle Error\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ca href=\"https://docs.onflow.org/concepts/transaction-signing/#single-party-multiple-signatures\" rel=\"nofollow\"\u003eSingle party, multiple signatures\u003c/a\u003e\u003c/h3\u003e\u003ca id=\"user-content-single-party-multiple-signatures\" class=\"anchor\" aria-label=\"Permalink: Single party, multiple signatures\" href=\"#single-party-multiple-signatures\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eProposer, payer and authorizer are the same account (\u003ccode\u003e0x01\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eOnly the envelope must be signed.\u003c/li\u003e\n\u003cli\u003eEach key has weight 0.5, so two signatures are required.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAccount\u003c/th\u003e\n\u003cth\u003eKey ID\u003c/th\u003e\n\u003cth\u003eWeight\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003e0x01\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e1\u003c/td\u003e\n\u003ctd\u003e0.5\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003e0x01\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e2\u003c/td\u003e\n\u003ctd\u003e0.5\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let address = Flow.Address(\u0026quot;0x1\u0026quot;)\nlet signers = [YourSigner(address: address, keyIndex: 1), YourSigner(address: address, keyIndex: 2)]\ndo {\n var unsignedTx = try await flow.buildTransaction{\n cadence {\n \u0026quot;\u0026quot;\u0026quot;\n transaction { \n prepare(signer: AuthAccount) { log(signer.address) }\n }\n \u0026quot;\u0026quot;\u0026quot;\n }\n\n proposer {\n Flow.TransactionProposalKey(address: address, keyIndex: 1)\n }\n\n authorizers {\n address\n }\n }\n let signedTx = try await unsignedTx.sign(signers: signers)\n} catch {\n // Handle Error\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaddress\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eAddress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esigners\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eYourSigner\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e address\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eYourSigner\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e address\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003edo\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003evar\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eunsignedTx\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ebuildTransaction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003ecadence\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"\"\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e transaction { \u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e prepare(signer: AuthAccount) { log(signer.address) }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e \u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\"\"\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eproposer\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eTransactionProposalKey\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e address\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eauthorizers\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n address\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esignedTx\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e unsignedTx\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003esign\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003esigners\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e signers\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n // Handle Error\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ca href=\"https://docs.onflow.org/concepts/transaction-signing/#multiple-parties\" rel=\"nofollow\"\u003eMultiple parties\u003c/a\u003e\u003c/h3\u003e\u003ca id=\"user-content-multiple-parties\" class=\"anchor\" aria-label=\"Permalink: Multiple parties\" href=\"#multiple-parties\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eProposer and authorizer are the same account (\u003ccode\u003e0x01\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003ePayer is a separate account (\u003ccode\u003e0x02\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eAccount \u003ccode\u003e0x01\u003c/code\u003e signs the payload.\u003c/li\u003e\n\u003cli\u003eAccount \u003ccode\u003e0x02\u003c/code\u003e signs the envelope.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAccount \u003ccode\u003e0x02\u003c/code\u003e must sign last since it is the payer.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAccount\u003c/th\u003e\n\u003cth\u003eKey ID\u003c/th\u003e\n\u003cth\u003eWeight\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003e0x01\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e1\u003c/td\u003e\n\u003ctd\u003e1.0\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003e0x02\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e3\u003c/td\u003e\n\u003ctd\u003e1.0\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let addressA = Flow.Address(\u0026quot;0x1\u0026quot;)\nlet addressB = Flow.Address(\u0026quot;0x2\u0026quot;)\nlet signers = [YourSigner(address: addressA, keyIndex: 1), YourSigner(address: addressB, keyIndex: 3)]\ndo {\n var unsignedTx = try await flow.buildTransaction{\n cadence {\n \u0026quot;\u0026quot;\u0026quot;\n transaction { \n prepare(signer: AuthAccount) { log(signer.address) }\n }\n \u0026quot;\u0026quot;\u0026quot;\n }\n\n proposer {\n Flow.TransactionProposalKey(address: addressA, keyIndex: 1)\n }\n\n authorizers {\n addressA\n }\n }\n let signedTx = try await unsignedTx.sign(signers: signers)\n} catch {\n // Handle Error\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaddressA\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eAddress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaddressB\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eAddress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x2\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esigners\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eYourSigner\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e addressA\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eYourSigner\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e addressB\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e3\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003edo\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003evar\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eunsignedTx\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ebuildTransaction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003ecadence\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"\"\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e transaction { \u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e prepare(signer: AuthAccount) { log(signer.address) }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e \u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\"\"\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eproposer\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eTransactionProposalKey\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e addressA\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eauthorizers\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n addressA\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esignedTx\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e unsignedTx\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003esign\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003esigners\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e signers\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n // Handle Error\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ca href=\"https://docs.onflow.org/concepts/transaction-signing/#multiple-parties\" rel=\"nofollow\"\u003eMultiple parties, two authorizers\u003c/a\u003e\u003c/h3\u003e\u003ca id=\"user-content-multiple-parties-two-authorizers\" class=\"anchor\" aria-label=\"Permalink: Multiple parties, two authorizers\" href=\"#multiple-parties-two-authorizers\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eProposer and authorizer are the same account (\u003ccode\u003e0x01\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003ePayer is a separate account (\u003ccode\u003e0x02\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eAccount \u003ccode\u003e0x01\u003c/code\u003e signs the payload.\u003c/li\u003e\n\u003cli\u003eAccount \u003ccode\u003e0x02\u003c/code\u003e signs the envelope.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAccount \u003ccode\u003e0x02\u003c/code\u003e must sign last since it is the payer.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eAccount \u003ccode\u003e0x02\u003c/code\u003e is also an authorizer to show how to include two AuthAccounts into an transaction\u003c/li\u003e\n\u003c/ul\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAccount\u003c/th\u003e\n\u003cth\u003eKey ID\u003c/th\u003e\n\u003cth\u003eWeight\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003e0x01\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e1\u003c/td\u003e\n\u003ctd\u003e1.0\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003e0x02\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e3\u003c/td\u003e\n\u003ctd\u003e1.0\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let addressA = Flow.Address(\u0026quot;0x1\u0026quot;)\nlet addressB = Flow.Address(\u0026quot;0x2\u0026quot;)\nlet signers = [YourSigner(address: addressA, keyIndex: 1), YourSigner(address: addressB, keyIndex: 3)]\ndo {\n var unsignedTx = try await flow.buildTransaction{\n cadence {\n \u0026quot;\u0026quot;\u0026quot;\n transaction {\n prepare(signer1: AuthAccount, signer2: AuthAccount) {\n log(signer.address)\n log(signer2.address)\n }\n }\n \u0026quot;\u0026quot;\u0026quot;\n }\n\n proposer {\n Flow.TransactionProposalKey(address: addressA, keyIndex: 1)\n }\n\n authorizers {\n [addressA, addressB]\n }\n }\n let signedTx = try await unsignedTx.sign(signers: signers)\n} catch {\n // Handle Error\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaddressA\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eAddress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaddressB\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eAddress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x2\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esigners\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eYourSigner\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e addressA\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eYourSigner\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e addressB\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e3\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003edo\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003evar\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eunsignedTx\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ebuildTransaction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003ecadence\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"\"\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e transaction {\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e prepare(signer1: AuthAccount, signer2: AuthAccount) {\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e log(signer.address)\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e log(signer2.address)\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e \u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\"\"\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eproposer\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eTransactionProposalKey\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e addressA\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eauthorizers\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003eaddressA\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e addressB\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esignedTx\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e unsignedTx\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003esign\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003esigners\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e signers\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n // Handle Error\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ca href=\"https://docs.onflow.org/concepts/transaction-signing/#multiple-parties\" rel=\"nofollow\"\u003eMultiple parties, multiple signatures\u003c/a\u003e\u003c/h3\u003e\u003ca id=\"user-content-multiple-parties-multiple-signatures\" class=\"anchor\" aria-label=\"Permalink: Multiple parties, multiple signatures\" href=\"#multiple-parties-multiple-signatures\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eProposer and authorizer are the same account (\u003ccode\u003e0x01\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003ePayer is a separate account (\u003ccode\u003e0x02\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eAccount \u003ccode\u003e0x01\u003c/code\u003e signs the payload.\u003c/li\u003e\n\u003cli\u003eAccount \u003ccode\u003e0x02\u003c/code\u003e signs the envelope.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAccount \u003ccode\u003e0x02\u003c/code\u003e must sign last since it is the payer.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eBoth accounts must sign twice (once with each of their keys).\u003c/li\u003e\n\u003c/ul\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAccount\u003c/th\u003e\n\u003cth\u003eKey ID\u003c/th\u003e\n\u003cth\u003eWeight\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003e0x01\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e1\u003c/td\u003e\n\u003ctd\u003e0.5\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003e0x01\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e2\u003c/td\u003e\n\u003ctd\u003e0.5\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003e0x02\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e3\u003c/td\u003e\n\u003ctd\u003e0.5\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003e0x02\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e4\u003c/td\u003e\n\u003ctd\u003e0.5\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let addressA = Flow.Address(\u0026quot;0x1\u0026quot;)\nlet addressB = Flow.Address(\u0026quot;0x2\u0026quot;)\nlet signers = [YourSigner(address: addressA, keyIndex: 1),\n YourSigner(address: addressA, keyIndex: 2), \n YourSigner(address: addressB, keyIndex: 3),\n YourSigner(address: addressB, keyIndex: 4)]\ndo {\n var unsignedTx = try await flow.buildTransaction{\n cadence {\n \u0026quot;\u0026quot;\u0026quot;\n transaction {\n prepare(signer1: AuthAccount, signer2: AuthAccount) {\n log(signer.address)\n log(signer2.address)\n }\n }\n \u0026quot;\u0026quot;\u0026quot;\n }\n\n proposer {\n Flow.TransactionProposalKey(address: addressA, keyIndex: 1)\n }\n\n authorizers {\n [addressA, addressB]\n }\n \n payer {\n addressB\n }\n }\n let signedTx = try await unsignedTx.sign(signers: signers)\n} catch {\n // Handle Error\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaddressA\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eAddress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaddressB\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eAddress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x2\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esigners\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eYourSigner\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e addressA\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eYourSigner\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e addressA\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \n \u003cspan class=\"pl-en\"\u003eYourSigner\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e addressB\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e3\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eYourSigner\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e addressB\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e4\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003edo\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003evar\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eunsignedTx\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ebuildTransaction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003ecadence\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"\"\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e transaction {\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e prepare(signer1: AuthAccount, signer2: AuthAccount) {\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e log(signer.address)\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e log(signer2.address)\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e }\u003c/span\u003e\n\u003cspan class=\"pl-s\"\u003e \u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\"\"\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eproposer\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eTransactionProposalKey\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e addressA\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e keyIndex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eauthorizers\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003eaddressA\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e addressB\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \n \u003cspan class=\"pl-en\"\u003epayer\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n addressB\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esignedTx\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e unsignedTx\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003esign\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003esigners\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e signers\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n // Handle Error\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSend Transactions\u003c/h3\u003e\u003ca id=\"user-content-send-transactions\" class=\"anchor\" aria-label=\"Permalink: Send Transactions\" href=\"#send-transactions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAfter a transaction has been \u003ca href=\"#build-transactions\"\u003ebuilt\u003c/a\u003e and \u003ca href=\"#sign-transactions\"\u003esigned\u003c/a\u003e, it can be sent to the Flow blockchain where it will be executed. If sending was successful you can then \u003ca href=\"#get-transactions\"\u003eretrieve the transaction result\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let result = try await flow.sendTransaction(signedTrnaction: signedTx)\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003esendTransaction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003esignedTrnaction\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e signedTx\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCreate Accounts\u003c/h3\u003e\u003ca id=\"user-content-create-accounts\" class=\"anchor\" aria-label=\"Permalink: Create Accounts\" href=\"#create-accounts\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOn Flow, account creation happens inside a transaction. Because the network allows for a many-to-many relationship between public keys and accounts, it's not possible to derive a new account address from a public key offline.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe Flow VM uses a deterministic address generation algorithm to assigen account addresses on chain. You can find more details about address generation in the \u003ca href=\"https://docs.onflow.org/concepts/accounts-and-keys/\" rel=\"nofollow\"\u003eaccounts \u0026amp; keys documentation\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePublic Key\u003c/h4\u003e\u003ca id=\"user-content-public-key\" class=\"anchor\" aria-label=\"Permalink: Public Key\" href=\"#public-key\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFlow uses ECDSA key pairs to control access to user accounts. Each key pair can be used in combination with the SHA2-256 or SHA3-256 hashing algorithms.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cg-emoji class=\"g-emoji\" alias=\"warning\"\u003eβ οΈ\u003c/g-emoji\u003e You'll need to authorize at least one public key to control your new account.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFlow represents ECDSA public keys in raw form without additional metadata. Each key is a single byte slice containing a concatenation of its X and Y components in big-endian byte form.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA Flow account can contain zero (not possible to control) or more public keys, referred to as account keys. Read more about \u003ca href=\"https://docs.onflow.org/concepts/accounts-and-keys/#accounts\" rel=\"nofollow\"\u003eaccounts in the documentation\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAn account key contains the following data:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eRaw public key (described above)\u003c/li\u003e\n\u003cli\u003eSignature algorithm\u003c/li\u003e\n\u003cli\u003eHash algorithm\u003c/li\u003e\n\u003cli\u003eWeight (integer between 0-1000)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eAccount creation happens inside a transaction, which means that somebody must pay to submit that transaction to the network. We'll call this person the account creator. Make sure you have read \u003ca href=\"#send-transactions\"\u003esending a transaction section\u003c/a\u003e first.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let accountKey = Flow.AccountKey(publicKey: Flow.PublicKey(hex: \u0026quot;0x1\u0026quot;),\n signAlgo: .ECDSA_P256,\n hashAlgo: .SHA2_256,\n weight: 1000)\n\nlet result = try await flow.createAccount(address: address, publicKeys: [accountKey], contracts: [scriptName: script], signers: signers)\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaccountKey\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eAccountKey\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003epublicKey\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFlow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ePublicKey\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003ehex\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e0x1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n signAlgo\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003eECDSA_P256\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n hashAlgo\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003eSHA2_256\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n weight\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1000\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecreateAccount\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e address\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e publicKeys\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003eaccountKey\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e contracts\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003escriptName\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e script\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e signers\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e signers\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAfter the account creation transaction has been submitted you can retrieve the new account address by \u003ca href=\"#get-transactions\"\u003egetting the transaction result\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe new account address will be emitted in a system-level \u003ccode\u003eflow.AccountCreated\u003c/code\u003e event.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let txID = try await flow.createAccount(address: address, publicKeys: [accountKey], contracts: [scriptName: script], signers: signers).wait()\nlet result = try wait txID.onceSealed().wait()\nlet event = result.events.first{ $0.type == \u0026quot;flow.AccountCreated\u0026quot; }\nlet field = event?.payload.fields?.value.toEvent()?.fields.first{$0.name == \u0026quot;address\u0026quot;}\nlet address = field?.value.value.toAddress()?.hex\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003etxID\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e flow\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecreateAccount\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eaddress\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e address\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e publicKeys\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003eaccountKey\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e contracts\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003escriptName\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e script\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e signers\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e signers\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ewait\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003ewait\u003c/span\u003e txID\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eonceSealed\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ewait\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eevent\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e result\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003eevents\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003efirst\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e $0\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003etype \u003cspan class=\"pl-c1\"\u003e==\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eflow.AccountCreated\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efield\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e event\u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-c1\"\u003e?\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003epayload\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003efields\u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-c1\"\u003e?\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003evalue\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003etoEvent\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-c1\"\u003e?\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003efields\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003efirst\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e$0\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003ename \u003cspan class=\"pl-c1\"\u003e==\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eaddress\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eaddress\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e field\u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-c1\"\u003e?\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003evalue\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003evalue\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003etoAddress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-c1\"\u003e?\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003ehex\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGenerate Keys\u003c/h3\u003e\u003ca id=\"user-content-generate-keys\" class=\"anchor\" aria-label=\"Permalink: Generate Keys\" href=\"#generate-keys\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo generating the key, please check our another SDK - \u003ca href=\"https://github.com/Outblock/flow-wallet-kit\"\u003eFlow Wallet Kit\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eReference\u003c/h2\u003e\u003ca id=\"user-content-reference\" class=\"anchor\" aria-label=\"Permalink: Reference\" href=\"#reference\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eInspired by \u003ca href=\"https://github.com/the-nft-company/flow-jvm-sdk\"\u003eflow-jvm\u003c/a\u003e\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":2,"text":"Overview","anchor":"overview","htmlText":"Overview"},{"level":2,"text":"Getting Started","anchor":"getting-started","htmlText":"Getting Started"},{"level":3,"text":"Installing","anchor":"installing","htmlText":"Installing"},{"level":2,"text":"Config","anchor":"config","htmlText":"Config"},{"level":3,"text":"(Optional) GRPC Acces Node","anchor":"optional-grpc-acces-node","htmlText":"(Optional) GRPC Acces Node"},{"level":2,"text":"Querying the Flow Network","anchor":"querying-the-flow-network","htmlText":"Querying the Flow Network"},{"level":3,"text":"Get Blocks","anchor":"get-blocks","htmlText":"Get Blocks"},{"level":4,"text":"Examples","anchor":"examples","htmlText":"Examples"},{"level":3,"text":"Get Account","anchor":"get-account","htmlText":"Get 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aria-label="Outline" aria-haspopup="true" aria-expanded="false" tabindex="0" class="Box-sc-g0xbh4-0 cwoBXV prc-Button-ButtonBase-c50BI" data-loading="false" data-size="medium" data-variant="invisible" aria-describedby=":Rr9ab:-loading-announcement" id=":Rr9ab:"><svg aria-hidden="true" focusable="false" class="octicon octicon-list-unordered" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M5.75 2.5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5ZM2 14a1 1 0 1 1 0-2 1 1 0 0 1 0 2Zm1-6a1 1 0 1 1-2 0 1 1 0 0 1 2 0ZM2 4a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg></button></div><div class="Box-sc-g0xbh4-0 QkQOb js-snippet-clipboard-copy-unpositioned undefined" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><br> <div align="center" dir="auto"> <a href="/Outblock/flow-swift/blob/main"> <img src="https://raw.githubusercontent.com/Outblock/flow-swift/main/Resources/logo.svg" alt="Logo" width="600" height="auto" style="max-width: 100%;"> </a> <p align="center" dir="auto"> <br> <a href="https://github.com/Outblock/flow-swift"><strong>View on GitHub Β»</strong></a> <br><br> <a href="https://Outblock.github.io/flow-swift" rel="nofollow">SDK Specifications</a> Β· <a href="/Outblock/flow-swift/blob/main">Contribute</a> Β· <a href="/Outblock/flow-swift/blob/main">Report a Bug</a> </p> </div> <br> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Overview</h2><a id="user-content-overview" class="anchor" aria-label="Permalink: Overview" href="#overview"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This reference documents all the methods available in the SDK, and explains in detail how these methods work. SDKs are open source, and you can use them according to the licence.</p> <p dir="auto">The library client specifications can be found here:</p> <p dir="auto"><a href="https://outblock.github.io/flow-swift/" rel="nofollow">https://outblock.github.io/flow-swift/</a></p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Getting Started</h2><a id="user-content-getting-started" class="anchor" aria-label="Permalink: Getting Started" href="#getting-started"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Installing</h3><a id="user-content-installing" class="anchor" aria-label="Permalink: Installing" href="#installing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This is a Swift Package, and can be installed via Xcode with the URL of this repository:</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content=".package(name: "Flow", url: "https://github.com/outblock/flow-swift.git", from: "0.4.0")"><pre><span class="pl-kos">.</span><span class="pl-k">package</span><span class="pl-kos">(</span>name<span class="pl-kos">:</span> <span class="pl-s">"</span><span class="pl-s">Flow</span><span class="pl-s">"</span><span class="pl-kos">,</span> url<span class="pl-kos">:</span> <span class="pl-s">"</span><span class="pl-s">https://github.com/outblock/flow-swift.git</span><span class="pl-s">"</span><span class="pl-kos">,</span> from<span class="pl-kos">:</span> <span class="pl-s">"</span><span class="pl-s">0.4.0</span><span class="pl-s">"</span><span class="pl-kos">)</span></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Config</h2><a id="user-content-config" class="anchor" aria-label="Permalink: Config" href="#config"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The library uses gRPC to communicate with the access nodes and it must be configured with correct access node API URL.</p> <p dir="auto">π <strong>Access API URLs</strong> can be found <a href="https://docs.onflow.org/access-api/#flow-access-node-endpoints" rel="nofollow">here</a>. An error will be returned if the host is unreachable. The Access Nodes APIs hosted by DapperLabs are accessible at:</p> <ul dir="auto"> <li>Testnet <code>access.devnet.nodes.onflow.org:9000</code></li> <li>Mainnet <code>access.mainnet.nodes.onflow.org:9000</code></li> <li>Local Emulator <code>127.0.0.1:3569</code></li> </ul> <p dir="auto">To config the SDK, you just need to provider the chainID for it. The default chainID is <strong>Mainnet</strong>. For example, if you want to use testnet, you can config the chainID like this:</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="flow.configure(chainID: .testnet)"><pre>flow<span class="pl-kos">.</span><span class="pl-en">configure</span><span class="pl-kos">(</span>chainID<span class="pl-kos">:</span> <span class="pl-kos">.</span>testnet<span class="pl-kos">)</span></pre></div> <p dir="auto">Moreover, if you want to use a custom gRPC endpoint for the access API, here is the way to do it:</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let endpoint = Flow.ChainID.Endpoint(node: "flow-testnet.g.alchemy.com", port: 443) let chainID = Flow.ChainID.custom(name: "Alchemy-Testnet", endpoint:endpoint) flow.configure(chainID: chainID)"><pre><span class="pl-k">let</span> <span class="pl-s1">endpoint</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span>ChainID<span class="pl-kos">.</span><span class="pl-en">Endpoint</span><span class="pl-kos">(</span>node<span class="pl-kos">:</span> <span class="pl-s">"</span><span class="pl-s">flow-testnet.g.alchemy.com</span><span class="pl-s">"</span><span class="pl-kos">,</span> port<span class="pl-kos">:</span> <span class="pl-c1">443</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">chainID</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span>ChainID<span class="pl-kos">.</span><span class="pl-en">custom</span><span class="pl-kos">(</span>name<span class="pl-kos">:</span> <span class="pl-s">"</span><span class="pl-s">Alchemy-Testnet</span><span class="pl-s">"</span><span class="pl-kos">,</span> endpoint<span class="pl-kos">:</span>endpoint<span class="pl-kos">)</span> flow<span class="pl-kos">.</span><span class="pl-en">configure</span><span class="pl-kos">(</span>chainID<span class="pl-kos">:</span> chainID<span class="pl-kos">)</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">(Optional) GRPC Acces Node</h3><a id="user-content-optional-grpc-acces-node" class="anchor" aria-label="Permalink: (Optional) GRPC Acces Node" href="#optional-grpc-acces-node"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If you want to use g-RPC access client better than HTTP client, please import this repo instead: <a href="https://github.com/Outblock/flow-swift-gRPC">flow-swift-gRPC</a></p> <p dir="auto">Here is the example how you initialize it:</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let accessAPI = Flow.GRPCAccessAPI(chainID: .mainnet)! let chainID = Flow.ChainID.mainnet flow.configure(chainID: chainID, accessAPI: accessAPI)"><pre><span class="pl-k">let</span> <span class="pl-s1">accessAPI</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">GRPCAccessAPI</span><span class="pl-kos">(</span>chainID<span class="pl-kos">:</span> <span class="pl-kos">.</span>mainnet<span class="pl-kos">)</span>! <span class="pl-k">let</span> <span class="pl-s1">chainID</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span>ChainID<span class="pl-kos">.</span>mainnet flow<span class="pl-kos">.</span><span class="pl-en">configure</span><span class="pl-kos">(</span>chainID<span class="pl-kos">:</span> chainID<span class="pl-kos">,</span> accessAPI<span class="pl-kos">:</span> accessAPI<span class="pl-kos">)</span></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Querying the Flow Network</h2><a id="user-content-querying-the-flow-network" class="anchor" aria-label="Permalink: Querying the Flow Network" href="#querying-the-flow-network"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">After you have established a connection with an access node, you can query the Flow network to retrieve data about blocks, accounts, events and transactions. We will explore how to retrieve each of these entities in the sections below.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Get Blocks</h3><a id="user-content-get-blocks" class="anchor" aria-label="Permalink: Get Blocks" href="#get-blocks"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Query the network for block by id, height or get the latest block.</p> <p dir="auto">π <strong>Block ID</strong> is SHA3-256 hash of the entire block payload. This hash is stored as an ID field on any block response object (ie. response from <code>GetLatestBlock</code>).</p> <p dir="auto">π <strong>Block height</strong> expresses the height of the block on the chain. The latest block height increases by one for every valid block produced.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Examples</h4><a id="user-content-examples" class="anchor" aria-label="Permalink: Examples" href="#examples"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This example depicts ways to get the latest block as well as any other block by height or ID:</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let result = try await flow.getLatestBlock(sealed: true)"><pre><span class="pl-k">let</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">getLatestBlock</span><span class="pl-kos">(</span>sealed<span class="pl-kos">:</span> <span class="pl-c1">true</span><span class="pl-kos">)</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Get Account</h3><a id="user-content-get-account" class="anchor" aria-label="Permalink: Get Account" href="#get-account"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Retrieve any account from Flow network's latest block or from a specified block height.</p> <p dir="auto">π <strong>Account address</strong> is a unique account identifier. Be mindful about the <code>0x</code> prefix, you should use the prefix as a default representation but be careful and safely handle user inputs without the prefix.</p> <p dir="auto">An account includes the following data:</p> <ul dir="auto"> <li>Address: the account address.</li> <li>Balance: balance of the account.</li> <li>Contracts: list of contracts deployed to the account.</li> <li>Keys: list of keys associated with the account.</li> </ul> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Examples</h4><a id="user-content-examples-1" class="anchor" aria-label="Permalink: Examples" href="#examples-1"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Example depicts ways to get an account at the latest block and at a specific block height:</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let address = Flow.Address(hex: "0x1") // Handle Success Result let result = try await flow.getAccountAtLatestBlock(address: address)"><pre><span class="pl-k">let</span> <span class="pl-s1">address</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">Address</span><span class="pl-kos">(</span>hex<span class="pl-kos">:</span> <span class="pl-s">"</span><span class="pl-s">0x1</span><span class="pl-s">"</span><span class="pl-kos">)</span> // Handle Success Result <span class="pl-k">let</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">getAccountAtLatestBlock</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> address<span class="pl-kos">)</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Get Transactions</h3><a id="user-content-get-transactions" class="anchor" aria-label="Permalink: Get Transactions" href="#get-transactions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Retrieve transactions from the network by providing a transaction ID. After a transaction has been submitted, you can also get the transaction result to check the status.</p> <p dir="auto">π <strong>Transaction ID</strong> is a hash of the encoded transaction payload and can be calculated before submitting the transaction to the network.</p> <p dir="auto"><g-emoji class="g-emoji" alias="warning">β οΈ</g-emoji> The transaction ID provided must be from the current spork.</p> <p dir="auto">π <strong>Transaction status</strong> represents the state of transaction in the blockchain. Status can change until is finali .</p> <markdown-accessiblity-table><table> <thead> <tr> <th>Status</th> <th>Final</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td>UNKNOWN</td> <td>β</td> <td>The transaction has not yet been seen by the network</td> </tr> <tr> <td>PENDING</td> <td>β</td> <td>The transaction has not yet been included in a block</td> </tr> <tr> <td>FINALIZED</td> <td>β</td> <td>The transaction has been included in a block</td> </tr> <tr> <td>EXECUTED</td> <td>β</td> <td>The transaction has been executed but the result has not yet been sealed</td> </tr> <tr> <td>SEALED</td> <td>β </td> <td>The transaction has been executed and the result is sealed in a block</td> </tr> <tr> <td>EXPIRED</td> <td>β </td> <td>The transaction reference block is outdated before being executed</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let id = Flow.ID(hex: "0x1") let result = try await flow.getTransactionById(id: id)"><pre><span class="pl-k">let</span> <span class="pl-s1">id</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">ID</span><span class="pl-kos">(</span>hex<span class="pl-kos">:</span> <span class="pl-s">"</span><span class="pl-s">0x1</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">getTransactionById</span><span class="pl-kos">(</span>id<span class="pl-kos">:</span> id<span class="pl-kos">)</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Get Events</h3><a id="user-content-get-events" class="anchor" aria-label="Permalink: Get Events" href="#get-events"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Retrieve events by a given type in a specified block height range or through a list of block IDs.</p> <p dir="auto">π <strong>Event type</strong> is a string that follow a standard format:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="A.{contract address}.{contract name}.{event name}"><pre class="notranslate"><code>A.{contract address}.{contract name}.{event name} </code></pre></div> <p dir="auto">Please read more about <a href="https://docs.onflow.org/core-contracts/flow-token/" rel="nofollow">events in the documentation</a>. The exception to this standard are core events, and you should read more about them in <a href="https://docs.onflow.org/cadence/language/core-events/" rel="nofollow">this document</a>.</p> <p dir="auto">π <strong>Block height range</strong> expresses the height of the start and end block in the chain.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Examples</h4><a id="user-content-examples-2" class="anchor" aria-label="Permalink: Examples" href="#examples-2"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Example depicts ways to get events within block range or by block IDs:</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let eventName = "A.{contract address}.{contract name}.{event name}" let blockIds: [Flow.ID] = [.init(hex: "0x1"), .init(hex: "0x2") ] let result = try await flow.getEventsForHeightRange(type: eventName, range: 10...20)"><pre><span class="pl-k">let</span> <span class="pl-s1">eventName</span> <span class="pl-c1">=</span> <span class="pl-s">"</span><span class="pl-s">A.{contract address}.{contract name}.{event name}</span><span class="pl-s">"</span> <span class="pl-k">let</span> <span class="pl-s1">blockIds</span><span class="pl-kos">:</span> <span class="pl-kos">[</span><span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-smi">ID</span><span class="pl-kos">]</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span><span class="pl-kos">.</span>init<span class="pl-kos">(</span>hex<span class="pl-kos">:</span> <span class="pl-s">"</span><span class="pl-s">0x1</span><span class="pl-s">"</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-kos">.</span>init<span class="pl-kos">(</span>hex<span class="pl-kos">:</span> <span class="pl-s">"</span><span class="pl-s">0x2</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-kos">]</span> <span class="pl-k">let</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">getEventsForHeightRange</span><span class="pl-kos">(</span>type<span class="pl-kos">:</span> eventName<span class="pl-kos">,</span> range<span class="pl-kos">:</span> <span class="pl-c1">10</span><span class="pl-c1">...</span><span class="pl-c1">20</span><span class="pl-kos">)</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Get Collections</h3><a id="user-content-get-collections" class="anchor" aria-label="Permalink: Get Collections" href="#get-collections"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Retrieve a batch of transactions that have been included in the same block, known as <em><strong>collections</strong></em>. Collections are used to improve consensus throughput by increasing the number of transactions per block and they act as a link between a block and a transaction.</p> <p dir="auto">π <strong>Collection ID</strong> is SHA3-256 hash of the collection payload.</p> <p dir="auto">Example retrieving a collection:</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let id = Flow.ID(hex: "0x1") let result = try await flow.getCollectionById(id: id)"><pre><span class="pl-k">let</span> <span class="pl-s1">id</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">ID</span><span class="pl-kos">(</span>hex<span class="pl-kos">:</span> <span class="pl-s">"</span><span class="pl-s">0x1</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">getCollectionById</span><span class="pl-kos">(</span>id<span class="pl-kos">:</span> id<span class="pl-kos">)</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Execute Scripts</h3><a id="user-content-execute-scripts" class="anchor" aria-label="Permalink: Execute Scripts" href="#execute-scripts"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Scripts allow you to write arbitrary non-mutating Cadence code on the Flow blockchain and return data. You can learn more about <a href="https://docs.onflow.org/cadence/language/" rel="nofollow">Cadence and scripts here</a>, but we are now only interested in executing the script code and getting back the data.</p> <p dir="auto">We can execute a script using the latest state of the Flow blockchain or we can choose to execute the script at a specific time in history defined by a block height or block ID.</p> <p dir="auto">π <strong>Block ID</strong> is SHA3-256 hash of the entire block payload, but you can get that value from the block response properties.</p> <p dir="auto">π <strong>Block height</strong> expresses the height of the block in the chain.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="// simple script pub fun main(a: Int): Int { return a + 10 } // complex script pub struct User { pub var balance: UFix64 pub var address: Address pub var name: String init(name: String, address: Address, balance: UFix64) { self.name = name self.address = address self.balance = balance } } pub fun main(name: String): User { return User( name: name, address: 0x1, balance: 10.0 ) }"><pre class="notranslate"><code>// simple script pub fun main(a: Int): Int { return a + 10 } // complex script pub struct User { pub var balance: UFix64 pub var address: Address pub var name: String init(name: String, address: Address, balance: UFix64) { self.name = name self.address = address self.balance = balance } } pub fun main(name: String): User { return User( name: name, address: 0x1, balance: 10.0 ) } </code></pre></div> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="struct User: Codable { let balance: Double let address: String let name: String } let result = try await flow.executeScriptAtLatestBlock(script: script, arguments: [.init(value: .string("test"))]) let model: User = try result.decode()"><pre><span class="pl-k">struct</span> <span class="pl-smi">User</span><span class="pl-kos">:</span> <span class="pl-smi">Codable</span> <span class="pl-kos">{</span> <span class="pl-k">let</span> <span class="pl-s1"><span class="pl-c1">balance</span></span><span class="pl-kos">:</span> <span class="pl-smi">Double</span> <span class="pl-k">let</span> <span class="pl-s1"><span class="pl-c1">address</span></span><span class="pl-kos">:</span> <span class="pl-smi">String</span> <span class="pl-k">let</span> <span class="pl-s1"><span class="pl-c1">name</span></span><span class="pl-kos">:</span> <span class="pl-smi">String</span> <span class="pl-kos">}</span> <span class="pl-k">let</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">executeScriptAtLatestBlock</span><span class="pl-kos">(</span>script<span class="pl-kos">:</span> script<span class="pl-kos">,</span> arguments<span class="pl-kos">:</span> <span class="pl-kos">[</span><span class="pl-kos">.</span>init<span class="pl-kos">(</span>value<span class="pl-kos">:</span> <span class="pl-kos">.</span>string<span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">test</span><span class="pl-s">"</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">]</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">model</span><span class="pl-kos">:</span> <span class="pl-smi">User</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> result<span class="pl-kos">.</span><span class="pl-en">decode</span><span class="pl-kos">(</span><span class="pl-kos">)</span></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Mutate Flow Network</h2><a id="user-content-mutate-flow-network" class="anchor" aria-label="Permalink: Mutate Flow Network" href="#mutate-flow-network"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Flow, like most blockchains, allows anybody to submit a transaction that mutates the shared global chain state. A transaction is an object that holds a payload, which describes the state mutation, and one or more authorizations that permit the transaction to mutate the state owned by specific accounts.</p> <p dir="auto">Transaction data is composed and signed with help of the SDK. The signed payload of transaction then gets submitted to the access node API. If a transaction is invalid or the correct number of authorizing signatures are not provided, it gets rejected.</p> <p dir="auto">Executing a transaction requires couple of steps:</p> <ul dir="auto"> <li><a href="#build-transactions">Building a transaction</a>.</li> <li><a href="#sign-transactions">Signing a transaction</a>.</li> <li><a href="#send-transactions">Sending a transaction</a>.</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Transactions</h2><a id="user-content-transactions" class="anchor" aria-label="Permalink: Transactions" href="#transactions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A transaction is nothing more than a signed set of data that includes script code which are instructions on how to mutate the network state and properties that define and limit it's execution. All these properties are explained bellow.</p> <p dir="auto">π <strong>Script</strong> field is the portion of the transaction that describes the state mutation logic. On Flow, transaction logic is written in <a href="https://docs.onflow.org/cadence/" rel="nofollow">Cadence</a>. Here is an example transaction script:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="transaction(greeting: String) { execute { log(greeting.concat(", World!")) } }"><pre class="notranslate"><code>transaction(greeting: String) { execute { log(greeting.concat(", World!")) } } </code></pre></div> <p dir="auto">π <strong>Arguments</strong>. A transaction can accept zero or more arguments that are passed into the Cadence script. The arguments on the transaction must match the number and order declared in the Cadence script. Sample script from above accepts a single <code>String</code> argument.</p> <p dir="auto">π <strong><a href="https://docs.onflow.org/concepts/transaction-signing/#proposal-key" rel="nofollow">Proposal key</a></strong> must be provided to act as a sequence number and prevent reply and other potential attacks.</p> <p dir="auto">Each account key maintains a separate transaction sequence counter; the key that lends its sequence number to a transaction is called the proposal key.</p> <p dir="auto">A proposal key contains three fields:</p> <ul dir="auto"> <li>Account address</li> <li>Key index</li> <li>Sequence number</li> </ul> <p dir="auto">A transaction is only valid if its declared sequence number matches the current on-chain sequence number for that key. The sequence number increments by one after the transaction is executed.</p> <p dir="auto">π <strong><a href="https://docs.onflow.org/concepts/transaction-signing/#signer-roles" rel="nofollow">Payer</a></strong> is the account that pays the fees for the transaction. A transaction must specify exactly one payer. The payer is only responsible for paying the network and gas fees; the transaction is not authorized to access resources or code stored in the payer account.</p> <p dir="auto">π <strong><a href="https://docs.onflow.org/concepts/transaction-signing/#signer-roles" rel="nofollow">Authorizers</a></strong> are accounts that authorize a transaction to read and mutate their resources. A transaction can specify zero or more authorizers, depending on how many accounts the transaction needs to access.</p> <p dir="auto">The number of authorizers on the transaction must match the number of AuthAccount parameters declared in the prepare statement of the Cadence script.</p> <p dir="auto">Example transaction with multiple authorizers:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="transaction { prepare(authorizer1: AuthAccount, authorizer2: AuthAccount) { } }"><pre class="notranslate"><code>transaction { prepare(authorizer1: AuthAccount, authorizer2: AuthAccount) { } } </code></pre></div> <p dir="auto">π <strong>Gas limit</strong> is the limit on the amount of computation a transaction requires, and it will abort if it exceeds its gas limit. Cadence uses metering to measure the number of operations per transaction. You can read more about it in the <a href="/Outblock/flow-swift/blob/main/cadence">Cadence documentation</a>.</p> <p dir="auto">The gas limit depends on the complexity of the transaction script. Until dedicated gas estimation tooling exists, it's best to use the emulator to test complex transactions and determine a safe limit.</p> <p dir="auto">π <strong>Reference block</strong> specifies an expiration window (measured in blocks) during which a transaction is considered valid by the network. A transaction will be rejected if it is submitted past its expiry block. Flow calculates transaction expiry using the <em>reference block</em> field on a transaction. A transaction expires after <code>600</code> blocks are committed on top of the reference block, which takes about 10 minutes at average Mainnet block rates.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Build Transactions</h3><a id="user-content-build-transactions" class="anchor" aria-label="Permalink: Build Transactions" href="#build-transactions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Building a transaction involves setting the required properties explained above and producing a transaction object.</p> <p dir="auto">Here we define a simple transaction script that will be used to execute on the network and serve as a good learning example. Quick example of building a transaction:</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let address = Flow.Address(hex: "0x1") var unsignedTx = try! flow.buildTransaction{ cadence { """ transaction(greeting: String) { let guest: Address prepare(authorizer: AuthAccount) { self.guest = authorizer.address } execute { log(greeting.concat(",").concat(guest.toString())) } } """ } proposer { // SequenceNumber is optional. If it's nil, it will fetch the updated one from the chain. Flow.TransactionProposalKey(address: address, keyIndex: 1) // If you are using the key 0, you can just pass the address // address } authorizers { address } arguments { [.string("Hello Flow!")] } // If payer is the same as proposer, you can ignore this field payer { address } // optional gasLimit { 1000 } }"><pre><span class="pl-k">let</span> <span class="pl-s1">address</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">Address</span><span class="pl-kos">(</span>hex<span class="pl-kos">:</span> <span class="pl-s">"</span><span class="pl-s">0x1</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-k">var</span> <span class="pl-s1">unsignedTx</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span><span class="pl-c1">!</span></span> flow<span class="pl-kos">.</span><span class="pl-en">buildTransaction</span><span class="pl-kos">{</span> <span class="pl-en">cadence</span> <span class="pl-kos">{</span> <span class="pl-s">"""</span><span class="pl-s"></span> <span class="pl-s"> transaction(greeting: String) {</span> <span class="pl-s"></span> <span class="pl-s"> let guest: Address</span> <span class="pl-s"></span> <span class="pl-s"> prepare(authorizer: AuthAccount) {</span> <span class="pl-s"> self.guest = authorizer.address</span> <span class="pl-s"> }</span> <span class="pl-s"></span> <span class="pl-s"> execute {</span> <span class="pl-s"> log(greeting.concat(</span><span class="pl-s">"</span><span class="pl-s">,</span><span class="pl-s">"</span><span class="pl-s">).concat(guest.toString()))</span> <span class="pl-s"> }</span> <span class="pl-s"> }</span> <span class="pl-s"> </span><span class="pl-s">"""</span> <span class="pl-kos">}</span> <span class="pl-en">proposer</span> <span class="pl-kos">{</span> // SequenceNumber is optional. If it's nil, it will fetch the updated one from the chain. <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">TransactionProposalKey</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> address<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">1</span><span class="pl-kos">)</span> // If you are using the key 0, you can just pass the address // address <span class="pl-kos">}</span> <span class="pl-en">authorizers</span> <span class="pl-kos">{</span> address <span class="pl-kos">}</span> <span class="pl-en">arguments</span> <span class="pl-kos">{</span> <span class="pl-kos">[</span><span class="pl-kos">.</span>string<span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">Hello Flow!</span><span class="pl-s">"</span><span class="pl-kos">)</span><span class="pl-kos">]</span> <span class="pl-kos">}</span> // If payer is the same as proposer, you can ignore this field <span class="pl-en">payer</span> <span class="pl-kos">{</span> address <span class="pl-kos">}</span> // optional <span class="pl-en">gasLimit</span> <span class="pl-kos">{</span> <span class="pl-c1">1000</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">After you have successfully <a href="#build-transactions">built a transaction</a> the next step in the process is to sign it.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Sign Transactions</h3><a id="user-content-sign-transactions" class="anchor" aria-label="Permalink: Sign Transactions" href="#sign-transactions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Flow introduces new concepts that allow for more flexibility when creating and signing transactions. Before trying the examples below, we recommend that you read through the <a href="https://docs.onflow.org/concepts/accounts-and-keys/" rel="nofollow">transaction signature documentation</a>.</p> <p dir="auto">After you have successfully <a href="#build-transactions">built a transaction</a> the next step in the process is to sign it. Flow transactions have envelope and payload signatures, and you should learn about each in the <a href="https://docs.onflow.org/concepts/accounts-and-keys/#anatomy-of-a-transaction" rel="nofollow">signature documentation</a>.</p> <p dir="auto">Signatures can be generated more securely using keys stored in a hardware device such as an <a href="https://en.wikipedia.org/wiki/Hardware_security_module" rel="nofollow">HSM</a>. The <code>crypto.Signer</code> interface is intended to be flexible enough to support a variety of signer implementations and is not limited to in-memory implementations.</p> <p dir="auto">To sign the transaction, you need create a list signer which confirm <strong>FlowSigner</strong> protocol.</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="public protocol FlowSigner { var address: Flow.Address { get set } var keyIndex: Int { get set } func signature(transaction: Flow.Transaction, signableData: Data) async throws -> Data }"><pre><span class="pl-k">public</span> <span class="pl-k">protocol</span> <span class="pl-smi">FlowSigner</span> <span class="pl-kos">{</span> <span class="pl-s1"><span class="pl-k">var</span> <span class="pl-c1">address</span></span><span class="pl-kos">:</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-smi">Address</span> <span class="pl-kos">{</span> <span class="pl-k">get</span> <span class="pl-k">set</span> <span class="pl-kos">}</span> <span class="pl-s1"><span class="pl-k">var</span> <span class="pl-c1">keyIndex</span></span><span class="pl-kos">:</span> <span class="pl-smi">Int</span> <span class="pl-kos">{</span> <span class="pl-k">get</span> <span class="pl-k">set</span> <span class="pl-kos">}</span> <span class="pl-en">func</span> signature<span class="pl-kos">(</span>transaction<span class="pl-kos">:</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-smi">Transaction</span><span class="pl-kos">,</span> signableData<span class="pl-kos">:</span> <span class="pl-smi">Data</span><span class="pl-kos">)</span> <span class="pl-k">async</span> <span class="pl-k">throws</span> <span class="pl-c1">-></span> <span class="pl-smi">Data</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">Flow supports great flexibility when it comes to transaction signing, we can define multiple authorizers (multi-sig transactions) and have different payer account than proposer. We will explore advanced signing scenarios bellow.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto"><a href="https://docs.onflow.org/concepts/transaction-signing/#single-party-single-signature" rel="nofollow">Single party, single signature</a></h3><a id="user-content-single-party-single-signature" class="anchor" aria-label="Permalink: Single party, single signature" href="#single-party-single-signature"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Proposer, payer and authorizer are the same account (<code>0x01</code>).</li> <li>Only the envelope must be signed.</li> <li>Proposal key must have full signing weight.</li> </ul> <markdown-accessiblity-table><table> <thead> <tr> <th>Account</th> <th>Key ID</th> <th>Weight</th> </tr> </thead> <tbody> <tr> <td><code>0x01</code></td> <td>1</td> <td>1.0</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let address = Flow.Address("0x1") let signers = [YourSigner(address: address, keyIndex: 1)] do { var unsignedTx = try await flow.buildTransaction{ cadence { """ transaction { prepare(signer: AuthAccount) { log(signer.address) } } """ } proposer { Flow.TransactionProposalKey(address: address, keyIndex: 1) } authorizers { address } } let signedTx = try await unsignedTx.sign(signers: signers) } catch { // Handle Error }"><pre><span class="pl-k">let</span> <span class="pl-s1">address</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">Address</span><span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">0x1</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">signers</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span><span class="pl-en">YourSigner</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> address<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">1</span><span class="pl-kos">)</span><span class="pl-kos">]</span> <span class="pl-k">do</span> <span class="pl-kos">{</span> <span class="pl-k">var</span> <span class="pl-s1">unsignedTx</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">buildTransaction</span><span class="pl-kos">{</span> <span class="pl-en">cadence</span> <span class="pl-kos">{</span> <span class="pl-s">"""</span><span class="pl-s"></span> <span class="pl-s"> transaction { </span> <span class="pl-s"> prepare(signer: AuthAccount) { log(signer.address) }</span> <span class="pl-s"> }</span> <span class="pl-s"> </span><span class="pl-s">"""</span> <span class="pl-kos">}</span> <span class="pl-en">proposer</span> <span class="pl-kos">{</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">TransactionProposalKey</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> address<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">1</span><span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-en">authorizers</span> <span class="pl-kos">{</span> address <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-k">let</span> <span class="pl-s1">signedTx</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> unsignedTx<span class="pl-kos">.</span><span class="pl-en">sign</span><span class="pl-kos">(</span>signers<span class="pl-kos">:</span> signers<span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">{</span> // Handle Error <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto"><a href="https://docs.onflow.org/concepts/transaction-signing/#single-party-multiple-signatures" rel="nofollow">Single party, multiple signatures</a></h3><a id="user-content-single-party-multiple-signatures" class="anchor" aria-label="Permalink: Single party, multiple signatures" href="#single-party-multiple-signatures"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Proposer, payer and authorizer are the same account (<code>0x01</code>).</li> <li>Only the envelope must be signed.</li> <li>Each key has weight 0.5, so two signatures are required.</li> </ul> <markdown-accessiblity-table><table> <thead> <tr> <th>Account</th> <th>Key ID</th> <th>Weight</th> </tr> </thead> <tbody> <tr> <td><code>0x01</code></td> <td>1</td> <td>0.5</td> </tr> <tr> <td><code>0x01</code></td> <td>2</td> <td>0.5</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let address = Flow.Address("0x1") let signers = [YourSigner(address: address, keyIndex: 1), YourSigner(address: address, keyIndex: 2)] do { var unsignedTx = try await flow.buildTransaction{ cadence { """ transaction { prepare(signer: AuthAccount) { log(signer.address) } } """ } proposer { Flow.TransactionProposalKey(address: address, keyIndex: 1) } authorizers { address } } let signedTx = try await unsignedTx.sign(signers: signers) } catch { // Handle Error }"><pre><span class="pl-k">let</span> <span class="pl-s1">address</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">Address</span><span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">0x1</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">signers</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span><span class="pl-en">YourSigner</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> address<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">1</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-en">YourSigner</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> address<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">2</span><span class="pl-kos">)</span><span class="pl-kos">]</span> <span class="pl-k">do</span> <span class="pl-kos">{</span> <span class="pl-k">var</span> <span class="pl-s1">unsignedTx</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">buildTransaction</span><span class="pl-kos">{</span> <span class="pl-en">cadence</span> <span class="pl-kos">{</span> <span class="pl-s">"""</span><span class="pl-s"></span> <span class="pl-s"> transaction { </span> <span class="pl-s"> prepare(signer: AuthAccount) { log(signer.address) }</span> <span class="pl-s"> }</span> <span class="pl-s"> </span><span class="pl-s">"""</span> <span class="pl-kos">}</span> <span class="pl-en">proposer</span> <span class="pl-kos">{</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">TransactionProposalKey</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> address<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">1</span><span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-en">authorizers</span> <span class="pl-kos">{</span> address <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-k">let</span> <span class="pl-s1">signedTx</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> unsignedTx<span class="pl-kos">.</span><span class="pl-en">sign</span><span class="pl-kos">(</span>signers<span class="pl-kos">:</span> signers<span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">{</span> // Handle Error <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto"><a href="https://docs.onflow.org/concepts/transaction-signing/#multiple-parties" rel="nofollow">Multiple parties</a></h3><a id="user-content-multiple-parties" class="anchor" aria-label="Permalink: Multiple parties" href="#multiple-parties"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Proposer and authorizer are the same account (<code>0x01</code>).</li> <li>Payer is a separate account (<code>0x02</code>).</li> <li>Account <code>0x01</code> signs the payload.</li> <li>Account <code>0x02</code> signs the envelope. <ul dir="auto"> <li>Account <code>0x02</code> must sign last since it is the payer.</li> </ul> </li> </ul> <markdown-accessiblity-table><table> <thead> <tr> <th>Account</th> <th>Key ID</th> <th>Weight</th> </tr> </thead> <tbody> <tr> <td><code>0x01</code></td> <td>1</td> <td>1.0</td> </tr> <tr> <td><code>0x02</code></td> <td>3</td> <td>1.0</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let addressA = Flow.Address("0x1") let addressB = Flow.Address("0x2") let signers = [YourSigner(address: addressA, keyIndex: 1), YourSigner(address: addressB, keyIndex: 3)] do { var unsignedTx = try await flow.buildTransaction{ cadence { """ transaction { prepare(signer: AuthAccount) { log(signer.address) } } """ } proposer { Flow.TransactionProposalKey(address: addressA, keyIndex: 1) } authorizers { addressA } } let signedTx = try await unsignedTx.sign(signers: signers) } catch { // Handle Error }"><pre><span class="pl-k">let</span> <span class="pl-s1">addressA</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">Address</span><span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">0x1</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">addressB</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">Address</span><span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">0x2</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">signers</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span><span class="pl-en">YourSigner</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> addressA<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">1</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-en">YourSigner</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> addressB<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">3</span><span class="pl-kos">)</span><span class="pl-kos">]</span> <span class="pl-k">do</span> <span class="pl-kos">{</span> <span class="pl-k">var</span> <span class="pl-s1">unsignedTx</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">buildTransaction</span><span class="pl-kos">{</span> <span class="pl-en">cadence</span> <span class="pl-kos">{</span> <span class="pl-s">"""</span><span class="pl-s"></span> <span class="pl-s"> transaction { </span> <span class="pl-s"> prepare(signer: AuthAccount) { log(signer.address) }</span> <span class="pl-s"> }</span> <span class="pl-s"> </span><span class="pl-s">"""</span> <span class="pl-kos">}</span> <span class="pl-en">proposer</span> <span class="pl-kos">{</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">TransactionProposalKey</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> addressA<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">1</span><span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-en">authorizers</span> <span class="pl-kos">{</span> addressA <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-k">let</span> <span class="pl-s1">signedTx</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> unsignedTx<span class="pl-kos">.</span><span class="pl-en">sign</span><span class="pl-kos">(</span>signers<span class="pl-kos">:</span> signers<span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">{</span> // Handle Error <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto"><a href="https://docs.onflow.org/concepts/transaction-signing/#multiple-parties" rel="nofollow">Multiple parties, two authorizers</a></h3><a id="user-content-multiple-parties-two-authorizers" class="anchor" aria-label="Permalink: Multiple parties, two authorizers" href="#multiple-parties-two-authorizers"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Proposer and authorizer are the same account (<code>0x01</code>).</li> <li>Payer is a separate account (<code>0x02</code>).</li> <li>Account <code>0x01</code> signs the payload.</li> <li>Account <code>0x02</code> signs the envelope. <ul dir="auto"> <li>Account <code>0x02</code> must sign last since it is the payer.</li> </ul> </li> <li>Account <code>0x02</code> is also an authorizer to show how to include two AuthAccounts into an transaction</li> </ul> <markdown-accessiblity-table><table> <thead> <tr> <th>Account</th> <th>Key ID</th> <th>Weight</th> </tr> </thead> <tbody> <tr> <td><code>0x01</code></td> <td>1</td> <td>1.0</td> </tr> <tr> <td><code>0x02</code></td> <td>3</td> <td>1.0</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let addressA = Flow.Address("0x1") let addressB = Flow.Address("0x2") let signers = [YourSigner(address: addressA, keyIndex: 1), YourSigner(address: addressB, keyIndex: 3)] do { var unsignedTx = try await flow.buildTransaction{ cadence { """ transaction { prepare(signer1: AuthAccount, signer2: AuthAccount) { log(signer.address) log(signer2.address) } } """ } proposer { Flow.TransactionProposalKey(address: addressA, keyIndex: 1) } authorizers { [addressA, addressB] } } let signedTx = try await unsignedTx.sign(signers: signers) } catch { // Handle Error }"><pre><span class="pl-k">let</span> <span class="pl-s1">addressA</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">Address</span><span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">0x1</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">addressB</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">Address</span><span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">0x2</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">signers</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span><span class="pl-en">YourSigner</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> addressA<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">1</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-en">YourSigner</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> addressB<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">3</span><span class="pl-kos">)</span><span class="pl-kos">]</span> <span class="pl-k">do</span> <span class="pl-kos">{</span> <span class="pl-k">var</span> <span class="pl-s1">unsignedTx</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">buildTransaction</span><span class="pl-kos">{</span> <span class="pl-en">cadence</span> <span class="pl-kos">{</span> <span class="pl-s">"""</span><span class="pl-s"></span> <span class="pl-s"> transaction {</span> <span class="pl-s"> prepare(signer1: AuthAccount, signer2: AuthAccount) {</span> <span class="pl-s"> log(signer.address)</span> <span class="pl-s"> log(signer2.address)</span> <span class="pl-s"> }</span> <span class="pl-s"> }</span> <span class="pl-s"> </span><span class="pl-s">"""</span> <span class="pl-kos">}</span> <span class="pl-en">proposer</span> <span class="pl-kos">{</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">TransactionProposalKey</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> addressA<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">1</span><span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-en">authorizers</span> <span class="pl-kos">{</span> <span class="pl-kos">[</span>addressA<span class="pl-kos">,</span> addressB<span class="pl-kos">]</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-k">let</span> <span class="pl-s1">signedTx</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> unsignedTx<span class="pl-kos">.</span><span class="pl-en">sign</span><span class="pl-kos">(</span>signers<span class="pl-kos">:</span> signers<span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">{</span> // Handle Error <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto"><a href="https://docs.onflow.org/concepts/transaction-signing/#multiple-parties" rel="nofollow">Multiple parties, multiple signatures</a></h3><a id="user-content-multiple-parties-multiple-signatures" class="anchor" aria-label="Permalink: Multiple parties, multiple signatures" href="#multiple-parties-multiple-signatures"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Proposer and authorizer are the same account (<code>0x01</code>).</li> <li>Payer is a separate account (<code>0x02</code>).</li> <li>Account <code>0x01</code> signs the payload.</li> <li>Account <code>0x02</code> signs the envelope. <ul dir="auto"> <li>Account <code>0x02</code> must sign last since it is the payer.</li> </ul> </li> <li>Both accounts must sign twice (once with each of their keys).</li> </ul> <markdown-accessiblity-table><table> <thead> <tr> <th>Account</th> <th>Key ID</th> <th>Weight</th> </tr> </thead> <tbody> <tr> <td><code>0x01</code></td> <td>1</td> <td>0.5</td> </tr> <tr> <td><code>0x01</code></td> <td>2</td> <td>0.5</td> </tr> <tr> <td><code>0x02</code></td> <td>3</td> <td>0.5</td> </tr> <tr> <td><code>0x02</code></td> <td>4</td> <td>0.5</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let addressA = Flow.Address("0x1") let addressB = Flow.Address("0x2") let signers = [YourSigner(address: addressA, keyIndex: 1), YourSigner(address: addressA, keyIndex: 2), YourSigner(address: addressB, keyIndex: 3), YourSigner(address: addressB, keyIndex: 4)] do { var unsignedTx = try await flow.buildTransaction{ cadence { """ transaction { prepare(signer1: AuthAccount, signer2: AuthAccount) { log(signer.address) log(signer2.address) } } """ } proposer { Flow.TransactionProposalKey(address: addressA, keyIndex: 1) } authorizers { [addressA, addressB] } payer { addressB } } let signedTx = try await unsignedTx.sign(signers: signers) } catch { // Handle Error }"><pre><span class="pl-k">let</span> <span class="pl-s1">addressA</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">Address</span><span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">0x1</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">addressB</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">Address</span><span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">0x2</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">signers</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span><span class="pl-en">YourSigner</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> addressA<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">1</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-en">YourSigner</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> addressA<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">2</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-en">YourSigner</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> addressB<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">3</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-en">YourSigner</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> addressB<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">4</span><span class="pl-kos">)</span><span class="pl-kos">]</span> <span class="pl-k">do</span> <span class="pl-kos">{</span> <span class="pl-k">var</span> <span class="pl-s1">unsignedTx</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">buildTransaction</span><span class="pl-kos">{</span> <span class="pl-en">cadence</span> <span class="pl-kos">{</span> <span class="pl-s">"""</span><span class="pl-s"></span> <span class="pl-s"> transaction {</span> <span class="pl-s"> prepare(signer1: AuthAccount, signer2: AuthAccount) {</span> <span class="pl-s"> log(signer.address)</span> <span class="pl-s"> log(signer2.address)</span> <span class="pl-s"> }</span> <span class="pl-s"> }</span> <span class="pl-s"> </span><span class="pl-s">"""</span> <span class="pl-kos">}</span> <span class="pl-en">proposer</span> <span class="pl-kos">{</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">TransactionProposalKey</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> addressA<span class="pl-kos">,</span> keyIndex<span class="pl-kos">:</span> <span class="pl-c1">1</span><span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-en">authorizers</span> <span class="pl-kos">{</span> <span class="pl-kos">[</span>addressA<span class="pl-kos">,</span> addressB<span class="pl-kos">]</span> <span class="pl-kos">}</span> <span class="pl-en">payer</span> <span class="pl-kos">{</span> addressB <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-k">let</span> <span class="pl-s1">signedTx</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> unsignedTx<span class="pl-kos">.</span><span class="pl-en">sign</span><span class="pl-kos">(</span>signers<span class="pl-kos">:</span> signers<span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">{</span> // Handle Error <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Send Transactions</h3><a id="user-content-send-transactions" class="anchor" aria-label="Permalink: Send Transactions" href="#send-transactions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">After a transaction has been <a href="#build-transactions">built</a> and <a href="#sign-transactions">signed</a>, it can be sent to the Flow blockchain where it will be executed. If sending was successful you can then <a href="#get-transactions">retrieve the transaction result</a>.</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let result = try await flow.sendTransaction(signedTrnaction: signedTx)"><pre><span class="pl-k">let</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">sendTransaction</span><span class="pl-kos">(</span>signedTrnaction<span class="pl-kos">:</span> signedTx<span class="pl-kos">)</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Create Accounts</h3><a id="user-content-create-accounts" class="anchor" aria-label="Permalink: Create Accounts" href="#create-accounts"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">On Flow, account creation happens inside a transaction. Because the network allows for a many-to-many relationship between public keys and accounts, it's not possible to derive a new account address from a public key offline.</p> <p dir="auto">The Flow VM uses a deterministic address generation algorithm to assigen account addresses on chain. You can find more details about address generation in the <a href="https://docs.onflow.org/concepts/accounts-and-keys/" rel="nofollow">accounts & keys documentation</a>.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Public Key</h4><a id="user-content-public-key" class="anchor" aria-label="Permalink: Public Key" href="#public-key"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Flow uses ECDSA key pairs to control access to user accounts. Each key pair can be used in combination with the SHA2-256 or SHA3-256 hashing algorithms.</p> <p dir="auto"><g-emoji class="g-emoji" alias="warning">β οΈ</g-emoji> You'll need to authorize at least one public key to control your new account.</p> <p dir="auto">Flow represents ECDSA public keys in raw form without additional metadata. Each key is a single byte slice containing a concatenation of its X and Y components in big-endian byte form.</p> <p dir="auto">A Flow account can contain zero (not possible to control) or more public keys, referred to as account keys. Read more about <a href="https://docs.onflow.org/concepts/accounts-and-keys/#accounts" rel="nofollow">accounts in the documentation</a>.</p> <p dir="auto">An account key contains the following data:</p> <ul dir="auto"> <li>Raw public key (described above)</li> <li>Signature algorithm</li> <li>Hash algorithm</li> <li>Weight (integer between 0-1000)</li> </ul> <p dir="auto">Account creation happens inside a transaction, which means that somebody must pay to submit that transaction to the network. We'll call this person the account creator. Make sure you have read <a href="#send-transactions">sending a transaction section</a> first.</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let accountKey = Flow.AccountKey(publicKey: Flow.PublicKey(hex: "0x1"), signAlgo: .ECDSA_P256, hashAlgo: .SHA2_256, weight: 1000) let result = try await flow.createAccount(address: address, publicKeys: [accountKey], contracts: [scriptName: script], signers: signers)"><pre><span class="pl-k">let</span> <span class="pl-s1">accountKey</span> <span class="pl-c1">=</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">AccountKey</span><span class="pl-kos">(</span>publicKey<span class="pl-kos">:</span> <span class="pl-smi">Flow</span><span class="pl-kos">.</span><span class="pl-en">PublicKey</span><span class="pl-kos">(</span>hex<span class="pl-kos">:</span> <span class="pl-s">"</span><span class="pl-s">0x1</span><span class="pl-s">"</span><span class="pl-kos">)</span><span class="pl-kos">,</span> signAlgo<span class="pl-kos">:</span> <span class="pl-kos">.</span>ECDSA_P256<span class="pl-kos">,</span> hashAlgo<span class="pl-kos">:</span> <span class="pl-kos">.</span>SHA2_256<span class="pl-kos">,</span> weight<span class="pl-kos">:</span> <span class="pl-c1">1000</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">createAccount</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> address<span class="pl-kos">,</span> publicKeys<span class="pl-kos">:</span> <span class="pl-kos">[</span>accountKey<span class="pl-kos">]</span><span class="pl-kos">,</span> contracts<span class="pl-kos">:</span> <span class="pl-kos">[</span>scriptName<span class="pl-kos">:</span> script<span class="pl-kos">]</span><span class="pl-kos">,</span> signers<span class="pl-kos">:</span> signers<span class="pl-kos">)</span></pre></div> <p dir="auto">After the account creation transaction has been submitted you can retrieve the new account address by <a href="#get-transactions">getting the transaction result</a>.</p> <p dir="auto">The new account address will be emitted in a system-level <code>flow.AccountCreated</code> event.</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let txID = try await flow.createAccount(address: address, publicKeys: [accountKey], contracts: [scriptName: script], signers: signers).wait() let result = try wait txID.onceSealed().wait() let event = result.events.first{ $0.type == "flow.AccountCreated" } let field = event?.payload.fields?.value.toEvent()?.fields.first{$0.name == "address"} let address = field?.value.value.toAddress()?.hex"><pre><span class="pl-k">let</span> <span class="pl-s1">txID</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span> flow<span class="pl-kos">.</span><span class="pl-en">createAccount</span><span class="pl-kos">(</span>address<span class="pl-kos">:</span> address<span class="pl-kos">,</span> publicKeys<span class="pl-kos">:</span> <span class="pl-kos">[</span>accountKey<span class="pl-kos">]</span><span class="pl-kos">,</span> contracts<span class="pl-kos">:</span> <span class="pl-kos">[</span>scriptName<span class="pl-kos">:</span> script<span class="pl-kos">]</span><span class="pl-kos">,</span> signers<span class="pl-kos">:</span> signers<span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">wait</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-smi">wait</span> txID<span class="pl-kos">.</span><span class="pl-en">onceSealed</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">wait</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">event</span> <span class="pl-c1">=</span> result<span class="pl-kos">.</span>events<span class="pl-kos">.</span><span class="pl-en">first</span><span class="pl-kos">{</span> $0<span class="pl-kos">.</span>type <span class="pl-c1">==</span> <span class="pl-s">"</span><span class="pl-s">flow.AccountCreated</span><span class="pl-s">"</span> <span class="pl-kos">}</span> <span class="pl-k">let</span> <span class="pl-s1">field</span> <span class="pl-c1">=</span> event<span class="pl-c1"><span class="pl-c1">?</span></span><span class="pl-kos">.</span>payload<span class="pl-kos">.</span>fields<span class="pl-c1"><span class="pl-c1">?</span></span><span class="pl-kos">.</span>value<span class="pl-kos">.</span><span class="pl-en">toEvent</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-c1"><span class="pl-c1">?</span></span><span class="pl-kos">.</span>fields<span class="pl-kos">.</span><span class="pl-en">first</span><span class="pl-kos">{</span>$0<span class="pl-kos">.</span>name <span class="pl-c1">==</span> <span class="pl-s">"</span><span class="pl-s">address</span><span class="pl-s">"</span><span class="pl-kos">}</span> <span class="pl-k">let</span> <span class="pl-s1">address</span> <span class="pl-c1">=</span> field<span class="pl-c1"><span class="pl-c1">?</span></span><span class="pl-kos">.</span>value<span class="pl-kos">.</span>value<span class="pl-kos">.</span><span class="pl-en">toAddress</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-c1"><span class="pl-c1">?</span></span><span class="pl-kos">.</span>hex</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Generate Keys</h3><a id="user-content-generate-keys" class="anchor" aria-label="Permalink: Generate Keys" href="#generate-keys"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">To generating the key, please check our another SDK - <a href="https://github.com/Outblock/flow-wallet-kit">Flow Wallet Kit</a></p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Reference</h2><a id="user-content-reference" class="anchor" aria-label="Permalink: Reference" href="#reference"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Inspired by <a href="https://github.com/the-nft-company/flow-jvm-sdk">flow-jvm</a></p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="qS/U7ItcluMo9IelLALsEm8MvXxot9XfWLRt/UOrUZClEhzkZoR0nHZ2vBoNLS4YytRpLAk359gwV+tTxAK0RQ==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> The tool to build application in Flow mobile realm π </p> <div class="my-3 d-flex flex-items-center"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link flex-shrink-0 mr-2"> <path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 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