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d="M12 1C5.9225 1 1 5.9225 1 12C1 16.8675 4.14875 20.9787 8.52125 22.4362C9.07125 22.5325 9.2775 22.2025 9.2775 21.9137C9.2775 21.6525 9.26375 20.7862 9.26375 19.865C6.5 20.3737 5.785 19.1912 5.565 18.5725C5.44125 18.2562 4.905 17.28 4.4375 17.0187C4.0525 16.8125 3.5025 16.3037 4.42375 16.29C5.29 16.2762 5.90875 17.0875 6.115 17.4175C7.105 19.0812 8.68625 18.6137 9.31875 18.325C9.415 17.61 9.70375 17.1287 10.02 16.8537C7.5725 16.5787 5.015 15.63 5.015 11.4225C5.015 10.2262 5.44125 9.23625 6.1425 8.46625C6.0325 8.19125 5.6475 7.06375 6.2525 5.55125C6.2525 5.55125 7.17375 5.2625 9.2775 6.67875C10.1575 6.43125 11.0925 6.3075 12.0275 6.3075C12.9625 6.3075 13.8975 6.43125 14.7775 6.67875C16.8813 5.24875 17.8025 5.55125 17.8025 5.55125C18.4075 7.06375 18.0225 8.19125 17.9125 8.46625C18.6138 9.23625 19.04 10.2125 19.04 11.4225C19.04 15.6437 16.4688 16.5787 14.0213 16.8537C14.42 17.1975 14.7638 17.8575 14.7638 18.8887C14.7638 20.36 14.75 21.5425 14.75 21.9137C14.75 22.2025 14.9563 22.5462 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class="HeaderMenu-wrapper d-flex flex-column flex-self-start flex-lg-row flex-auto rounded rounded-lg-0"> <nav class="HeaderMenu-nav" aria-label="Global"> <ul class="d-lg-flex list-style-none"> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Product <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"github_copilot","context":"product","tag":"link","label":"github_copilot_link_product_navbar"}" href="https://github.com/features/copilot"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-copilot color-fg-subtle mr-3"> <path d="M23.922 16.992c-.861 1.495-5.859 5.023-11.922 5.023-6.063 0-11.061-3.528-11.922-5.023A.641.641 0 0 1 0 16.736v-2.869a.841.841 0 0 1 .053-.22c.372-.935 1.347-2.292 2.605-2.656.167-.429.414-1.055.644-1.517a10.195 10.195 0 0 1-.052-1.086c0-1.331.282-2.499 1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 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version="1.1" width="24" data-view-component="true" class="octicon octicon-shield-check color-fg-subtle mr-3"> <path d="M16.53 9.78a.75.75 0 0 0-1.06-1.06L11 13.19l-1.97-1.97a.75.75 0 0 0-1.06 1.06l2.5 2.5a.75.75 0 0 0 1.06 0l5-5Z"></path><path d="m12.54.637 8.25 2.675A1.75 1.75 0 0 1 22 4.976V10c0 6.19-3.771 10.704-9.401 12.83a1.704 1.704 0 0 1-1.198 0C5.77 20.705 2 16.19 2 10V4.976c0-.758.489-1.43 1.21-1.664L11.46.637a1.748 1.748 0 0 1 1.08 0Zm-.617 1.426-8.25 2.676a.249.249 0 0 0-.173.237V10c0 5.46 3.28 9.483 8.43 11.426a.199.199 0 0 0 .14 0C17.22 19.483 20.5 15.461 20.5 10V4.976a.25.25 0 0 0-.173-.237l-8.25-2.676a.253.253 0 0 0-.154 0Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Advanced Security</div> Find and fix vulnerabilities </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" 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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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\u003ca href=\"https://travis-ci.org/elkrem/koyn\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/9d729e0989626b75b9767efc3528ed2b8cc9fd1664e4bc553317bd2d5c2cd7da/68747470733a2f2f7472617669732d63692e6f72672f656c6b72656d2f6b6f796e2e7376673f6272616e63683d6d6173746572\" alt=\"Build Status\" data-canonical-src=\"https://travis-ci.org/elkrem/koyn.svg?branch=master\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/h1\u003e\u003ca id=\"user-content-koyn-bitcoin-library-for-arduino-\" class=\"anchor\" aria-label=\"Permalink: Koyn: Bitcoin Library For Arduino \" href=\"#koyn-bitcoin-library-for-arduino-\"\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\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\"\u003eA fully decentralized and trustless Bitcoin light (aka SPV) client implementation for the Arduino platform based on Electrum protocol.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWith its simple and easy-to-use API, it allows you to interface Arduino boards to the Bitcoin network. The sky is the limit, you can either do a physical action when a transaction is made or send transactions based on hardware events.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eReadiness\u003c/h2\u003e\u003ca id=\"user-content-readiness\" class=\"anchor\" aria-label=\"Permalink: Readiness\" href=\"#readiness\"\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 should be working but it is still rough around the edges. It is considered to be a \u003cstrong\u003ework-in-progress\u003c/strong\u003e. It is by all means far from being production ready. It hasn't been thoroughly tested or gone through security reviews.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCurrently, it can only works with Bitcoin testnet \u003cstrong\u003e(no mainnet support yet)\u003c/strong\u003e. Be advised not to use real Bitcoins. We are not responsible for any loss of funds so use it at your own risk.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eArduino boards support is initially limited as well, please check below for more info.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAlso, the public interface hasn't been finalized yet, it can be changed a bit during the initial releases.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLight Clients\u003c/h2\u003e\u003ca id=\"user-content-light-clients\" class=\"anchor\" aria-label=\"Permalink: Light Clients\" href=\"#light-clients\"\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\"\u003eLight Bitcoin clients (nodes) doesn't store the full transaction history (blockchain) of the network (unlike full clients). They only download the headers (80 bytes every ~10 minutes) of the created blocks to be able to verify that a particular transaction was indeed included and accepted by the network. The concept is often referred to by the term \u003cem\u003eSPV\u003c/em\u003e (Simplified Payment Verification).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThere are two popular protocols for SPV clients. Bitcoin Core and Electrum, they pretty much have the same concept. The core protocol works with raw bytes and Electrum is JSON based. This library supports only Electrum protocol for now, thus it only works with Electrum servers.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHardware Requirements\u003c/h2\u003e\u003ca id=\"user-content-hardware-requirements\" class=\"anchor\" aria-label=\"Permalink: Hardware Requirements\" href=\"#hardware-requirements\"\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 requires an ESP8266 or ESP32 based board connected with an SPI microSD card module to work.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe microSD card needs to be a single partition, FAT formatted, fast (class 10) and has at least 1GB of space. It doesn't need to be empty as we create a new directory on its root named \u003ccode\u003ekoyn\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBoards Support\u003c/h2\u003e\u003ca id=\"user-content-boards-support\" class=\"anchor\" aria-label=\"Permalink: Boards Support\" href=\"#boards-support\"\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\"\u003eThese boards have been tested and are known to work:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eESP8266\u003c/strong\u003e\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAdafruit Huzzah ESP8266\u003c/li\u003e\n\u003cli\u003eWemos D1\u003c/li\u003e\n\u003cli\u003eSparkFun ESP8266 Thing\u003c/li\u003e\n\u003cli\u003eNodeMCU\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eESP32\u003c/strong\u003e\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eDOIT ESP32 DEVKIT V1\u003c/li\u003e\n\u003cli\u003eESPDUINO-32\u003c/li\u003e\n\u003cli\u003eSparkFun ESP32 Thing\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThese microSD card boards has been tested and known to work:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eWemos Micro SD Card Shield\u003c/li\u003e\n\u003cli\u003eSparkFun microSD Shield\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eInstallation\u003c/h2\u003e\u003ca id=\"user-content-installation\" class=\"anchor\" aria-label=\"Permalink: Installation\" href=\"#installation\"\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\"\u003eMake sure you have the latest version of \u003ca href=\"https://www.arduino.cc/en/Main/Software\" rel=\"nofollow\"\u003eArduino IDE\u003c/a\u003e with either \u003ca href=\"https://github.com/esp8266/Arduino#installing-with-boards-manager\"\u003eESP8266\u003c/a\u003e or \u003ca href=\"https://github.com/espressif/arduino-esp32#installation-instructions\"\u003eESP32\u003c/a\u003e cores installed.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eUsing Library Manager (Recommended)\u003c/strong\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOpen the Arduino IDE, go to Sketch \u0026gt; Include Library \u0026gt; Manage Libraries.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAnd then, search for our library in the list, pick the latest version and click install.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eManual Method\u003c/strong\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eDownload the latest version of the library from the \u003ca href=\"https://github.com/Elkrem/Koyn/releases\"\u003ereleases page\u003c/a\u003e. Unzip it in a new directory named \u003cem\u003eKoyn\u003c/em\u003e inside your Arduino's libraries directory.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003ePlatformIO\u003c/strong\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf you are using PlatformIO, the library can be installed from their library manager as well, just search for \u003ccode\u003eKoyn\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBlockchain Headers Syncing\u003c/h2\u003e\u003ca id=\"user-content-blockchain-headers-syncing\" class=\"anchor\" aria-label=\"Permalink: Blockchain Headers Syncing\" href=\"#blockchain-headers-syncing\"\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\"\u003eYou can choose to sync and validate the headers on the board directly starting from the genesis block, but it can take from tens of minutes to hours depending on your sketch and network conditions.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSo it is advised to preload the microSD card with the latest headers on a host machine before hand using one of the methods below, then rename it to \u003ccode\u003eblkhdrs\u003c/code\u003e and place it in \u003ccode\u003e/koyn\u003c/code\u003e directory on the microSD.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eUsing Our Tool (Recommended)\u003c/strong\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWe developed a command line tool based on \u003ca href=\"https://github.com/bitcoinj/bitcoinj\"\u003eBitcoinJ\u003c/a\u003e library that validates and downloads the Bitcoin blockchain headers to a file on your local machine.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFirst make sure you have a \u003ca href=\"https://java.com/en/download/\" rel=\"nofollow\"\u003eJava Runtime Environment\u003c/a\u003e installed on your host machine and accessible from your \u003ccode\u003ePATH\u003c/code\u003e. Then download the latest \u003ca href=\"https://github.com/elkrem/koyn-sync/releases\"\u003erelease\u003c/a\u003e of our tool. Then run the executable or call \u003ccode\u003ejava -jar koyn-sync-VERSION.jar\u003c/code\u003e from a command line terminal. (Make sure you are connected to the Internet, and the working directory is writable)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe tool will download the headers to your working directory and create either \u003ccode\u003e./koyn/mainnet/blkhdrs\u003c/code\u003e or \u003ccode\u003e./koyn/testnet/blkhdrs\u003c/code\u003e depending on the supplied \u003ca href=\"https://github.com/elkrem/koyn-sync#optional-flags\"\u003eflags\u003c/a\u003e. (Logging messages will show its progress)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eFrom Electrum Website\u003c/strong\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf you trust Electrum.org, you can download the headers directly from their website and the library will sync the rest of the headers when started.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eBitcoin \u003ca href=\"https://download.electrum.org/testnet_headers\" rel=\"nofollow\"\u003eTestnet Headers\u003c/a\u003e (till August, 2017)\u003c/li\u003e\n\u003cli\u003eBitcoin \u003ca href=\"https://download.electrum.org/blockchain_headers\" rel=\"nofollow\"\u003eMainnet Headers\u003c/a\u003e (till August, 2017)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eFrom Electrum App\u003c/strong\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eInstall Electrum client on your machine if you don't have it, run it, let it sync.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eYou may need to supply \u003ccode\u003e--testnet\u003c/code\u003e parameter before running the Electrum executable if you need to sync the \u003cstrong\u003etestnet\u003c/strong\u003e headers.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOn Windows, the headers file is located in \u003ccode\u003e%APPDATA%\\Electrum\\blockchain_headers\u003c/code\u003e or \u003ccode\u003e%APPDATA%\\Electrum\\testnet\\blockchain_headers\u003c/code\u003e if you are using the testnet. On Mac and Linux, the headers file is located in \u003ccode\u003e~/.electrum/blockchain_headers\u003c/code\u003e or \u003ccode\u003e~/.electrum/testnet/blockchain_headers\u003c/code\u003e if you are using the testnet.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote: Electrum versions \u0026gt;=3.1.0 \u003cstrong\u003edoes not\u003c/strong\u003e sync the headers from the genesis block and rely on the concept of checkpoints. So to sync using Electrum please use version below 3.1.0.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsage\u003c/h2\u003e\u003ca id=\"user-content-usage\" class=\"anchor\" aria-label=\"Permalink: Usage\" href=\"#usage\"\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\"\u003eWe tried to make our API as simple as possible, here are some samples.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eBare Minimum\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"#include \u0026quot;Koyn.h\u0026quot;\n\nvoid setup() {\n Koyn.begin();\n}\n\nvoid loop() {\n Koyn.run();\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e#include \"Koyn.h\"\n\nvoid setup() {\n Koyn.begin();\n}\n\nvoid loop() {\n Koyn.run();\n}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eTransaction Signing and Broadcasting\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"BitcoinAddress myAddress(\u0026quot;PRIVATE_KEY\u0026quot;, KEY_PRIVATE);\nKoyn.trackAddress(\u0026amp;myAddress);\nBitcoinAddress myFriendAddress(\u0026quot;BITCOIN_ADDRESS\u0026quot;, ADDRESS_ENCODED);\nKoyn.spend(\u0026amp;myAddress, \u0026amp;myFriendAddress, 100000000, 100000);\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eBitcoinAddress myAddress(\"PRIVATE_KEY\", KEY_PRIVATE);\nKoyn.trackAddress(\u0026amp;myAddress);\nBitcoinAddress myFriendAddress(\"BITCOIN_ADDRESS\", ADDRESS_ENCODED);\nKoyn.spend(\u0026amp;myAddress, \u0026amp;myFriendAddress, 100000000, 100000);\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eTransactions Tracking\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"void paymentCallback(BitcoinTransaction tx){\n\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003evoid paymentCallback(BitcoinTransaction tx){\n\n}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"Koyn.onNewTransaction(\u0026amp;paymentCallback);\nif(Koyn.isSynced()){\n Koyn.trackAddress(\u0026amp;myAddress);\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eKoyn.onNewTransaction(\u0026amp;paymentCallback);\nif(Koyn.isSynced()){\n Koyn.trackAddress(\u0026amp;myAddress);\n}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eComplete Example: Flash a light bulb with Bitcoin\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"#include \u0026lt;Koyn.h\u0026gt;\n\n#define LIGHT_BULB 13\n#define PAYMENT_VALUE 1000000\n\nBitcoinAddress myAddress(\u0026quot;PRIVATE_KEY\u0026quot;, KEY_PRIVATE);\nBitcoinAddress myFriendAddress(\u0026quot;BITCOIN_ADDRESS\u0026quot;, ADDRESS_ENCODED);\n\nvoid setup() {\n pinMode(LIGHT_BULB, OUTPUT);\n ..\n .. Connect to WiFi\n ..\n Koyn.begin(false);\n Koyn.onNewTransaction(\u0026amp;paymentCallback);\n}\n\nvoid loop() {\n if(Koyn.isSynced()){\n Koyn.trackAddress(\u0026amp;myAddress);\n }\n Koyn.run();\n}\n\nvoid paymentCallback(BitcoinTransaction tx){\n for(int i=0;i\u0026lt;tx.getInputsCount();i++)\n {\n BitcoinAddress from;\n tx.getInput(i, \u0026amp;from);\n if(from == myFriendAddress){\n for(int j=0;j\u0026lt;tx.getOutputsCount();j++)\n {\n BitcoinAddress to;\n tx.getOutput(j, \u0026amp;to);\n if(to == myAddress){\n if(tx.getOutputAmount(j) == PAYMENT_VALUE){\n digitalWrite(LIGHT_BULB, HIGH);\n Koyn.delay(1000);\n digitalWrite(LIGHT_BULB, LOW);\n }\n else{\n Koyn.spend(\u0026amp;myAddress, \u0026amp;myFriendAddress, tx.getOutputAmount(j), 100000);\n }\n break; \n }\n }\n break;\n }\n }\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e#include \u0026lt;Koyn.h\u0026gt;\n\n#define LIGHT_BULB 13\n#define PAYMENT_VALUE 1000000\n\nBitcoinAddress myAddress(\"PRIVATE_KEY\", KEY_PRIVATE);\nBitcoinAddress myFriendAddress(\"BITCOIN_ADDRESS\", ADDRESS_ENCODED);\n\nvoid setup() {\n pinMode(LIGHT_BULB, OUTPUT);\n ..\n .. Connect to WiFi\n ..\n Koyn.begin(false);\n Koyn.onNewTransaction(\u0026amp;paymentCallback);\n}\n\nvoid loop() {\n if(Koyn.isSynced()){\n Koyn.trackAddress(\u0026amp;myAddress);\n }\n Koyn.run();\n}\n\nvoid paymentCallback(BitcoinTransaction tx){\n for(int i=0;i\u0026lt;tx.getInputsCount();i++)\n {\n BitcoinAddress from;\n tx.getInput(i, \u0026amp;from);\n if(from == myFriendAddress){\n for(int j=0;j\u0026lt;tx.getOutputsCount();j++)\n {\n BitcoinAddress to;\n tx.getOutput(j, \u0026amp;to);\n if(to == myAddress){\n if(tx.getOutputAmount(j) == PAYMENT_VALUE){\n digitalWrite(LIGHT_BULB, HIGH);\n Koyn.delay(1000);\n digitalWrite(LIGHT_BULB, LOW);\n }\n else{\n Koyn.spend(\u0026amp;myAddress, \u0026amp;myFriendAddress, tx.getOutputAmount(j), 100000);\n }\n break; \n }\n }\n break;\n }\n }\n}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSupported Networks\u003c/h2\u003e\u003ca id=\"user-content-supported-networks\" class=\"anchor\" aria-label=\"Permalink: Supported Networks\" href=\"#supported-networks\"\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 class=\"contains-task-list\"\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\" checked=\"\"\u003e Bitcoin Testnet\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Bitcoin Mainnet\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Bitcoin Cash\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExamples\u003c/h2\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\"\u003eExamples that cover most of our APIs can be found \u003ca href=\"/elkrem/koyn/blob/master/examples\"\u003ehere\u003c/a\u003e.\u003c/p\u003e\n\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDocumentation\u003c/h2\u003e\u003ca id=\"user-content-documentation\" class=\"anchor\" aria-label=\"Permalink: Documentation\" href=\"#documentation\"\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\"\u003eDocumentation for all of the usable public methods, classes and configuration can be found in our \u003ca href=\"https://github.com/elkrem/koyn/wiki/Docs\"\u003eWiki\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eConfiguration And Defaults\u003c/h2\u003e\u003ca id=\"user-content-configuration-and-defaults\" class=\"anchor\" aria-label=\"Permalink: Configuration And Defaults\" href=\"#configuration-and-defaults\"\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\"\u003eMost of the hardcoded library defaults and configuration parameters can be edited \u003ca href=\"/elkrem/koyn/blob/master/src/Config.h\"\u003ehere\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eDebug messages can be enabled on the default Serial interface through the same file as well by uncommenting \u003ccode\u003e#define ENABLE_DEBUG_MESSAGES\u003c/code\u003e line.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eStatus and Roadmap\u003c/h2\u003e\u003ca id=\"user-content-status-and-roadmap\" class=\"anchor\" aria-label=\"Permalink: Status and Roadmap\" href=\"#status-and-roadmap\"\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 class=\"contains-task-list\"\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\" checked=\"\"\u003e Connects to multiple Electrum servers.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\" checked=\"\"\u003e Validates the headers one by one starting from the genesis block.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\" checked=\"\"\u003e Downloads (syncs) the latest blockchain headers and validates them.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\" checked=\"\"\u003e Track transactions to user's addresses.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\" checked=\"\"\u003e Validates incoming transactions and making sure they were accepted by the network.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\" checked=\"\"\u003e Sign and send transactions (from user's addresses) to the network.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Support headers checkpoints.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Support Bitcoin mainnet.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Support additional WiFi connected Arduino boards.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Support custom transactions.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Support P2SH transactions.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Support SegWit transactions and addresses.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Support hierarchical deterministic wallets (BIP32).\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Support mnemonic seed wallets (BIP39).\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Support logical hierarchy for deterministic wallets (BIP44).\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Add APIs to ease the workflow of payment channels.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\"\u003e Add APIs to ease the prototyping of hardware wallets.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eNotes and Caveats\u003c/h2\u003e\u003ca id=\"user-content-notes-and-caveats\" class=\"anchor\" aria-label=\"Permalink: Notes and Caveats\" href=\"#notes-and-caveats\"\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\u003eOnly P2PKH transactions and addresses are supported.\u003c/li\u003e\n\u003cli\u003eOnly non-SegWit transactions and addresses are supported.\u003c/li\u003e\n\u003cli\u003eOnly addresses generated from compressed public keys are supported.\u003c/li\u003e\n\u003cli\u003eThe library connects to non-TLS Electrum servers only.\u003c/li\u003e\n\u003cli\u003eThe library connects to a hardcoded list of bootnodes only for now, the \u003ccode\u003eserver.peers.subscribe\u003c/code\u003e call hasn't been implemented yet.\u003c/li\u003e\n\u003cli\u003eThe library works with Bitcoin testnet only for now.\u003c/li\u003e\n\u003cli\u003eThe library does cache private keys in memory.\u003c/li\u003e\n\u003cli\u003eThe library doesn't support true random generators yet (generated private keys and addresses rely on analog pin #0 noise).\u003c/li\u003e\n\u003cli\u003eDue to the limitation of hardware, there are some constraints on transaction sizes, tracked addresses number, transactions number kept in memory and others (Their defaults can be overwritten in \u003ccode\u003eConfig.h\u003c/code\u003e file)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAcquiring Testnet Bitcoins\u003c/h2\u003e\u003ca id=\"user-content-acquiring-testnet-bitcoins\" class=\"anchor\" aria-label=\"Permalink: Acquiring Testnet Bitcoins\" href=\"#acquiring-testnet-bitcoins\"\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\"\u003eTestnet bitcoins can be easily acquired using online faucets like \u003ca href=\"https://testnet.manu.backend.hamburg/faucet\" rel=\"nofollow\"\u003ethis\u003c/a\u003e and \u003ca href=\"https://testnet.coinfaucet.eu/en/\" rel=\"nofollow\"\u003ethis\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eChangelog\u003c/h2\u003e\u003ca id=\"user-content-changelog\" class=\"anchor\" aria-label=\"Permalink: Changelog\" href=\"#changelog\"\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 see what has changed in recent versions of Koyn library, see the \u003ca href=\"/elkrem/koyn/blob/master/CHANGELOG.md\"\u003echange log\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eContributing\u003c/h2\u003e\u003ca id=\"user-content-contributing\" class=\"anchor\" aria-label=\"Permalink: Contributing\" href=\"#contributing\"\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\"\u003eWe welcome all contributions from our community. If you've find a bug or can improve the code or want to add a new feature, please follow our \u003ca href=\"/elkrem/koyn/blob/master/CONTRIBUTING.md\"\u003econtributions guidelines\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLearn More\u003c/h2\u003e\u003ca id=\"user-content-learn-more\" class=\"anchor\" aria-label=\"Permalink: Learn More\" href=\"#learn-more\"\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\"\u003eBe the first to know about our future blockchain connected hardware products by subscribing to our mailing list at \u003ca href=\"https://elkrem.io\" rel=\"nofollow\"\u003eElkrem.io\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAttributions and Credits\u003c/h2\u003e\u003ca id=\"user-content-attributions-and-credits\" class=\"anchor\" aria-label=\"Permalink: Attributions and Credits\" href=\"#attributions-and-credits\"\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\u003e\u003ca href=\"https://github.com/interactive-matter/aJson\"\u003eaJson\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/HsuBokai/base58\"\u003eBase58\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/squix78/json-streaming-parser\"\u003eJson Streaming Parser\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/ARMmbed/mbedtls\"\u003eRipemd160\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/greiman/SdFat\"\u003eSdFat\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/Cathedrow/Cryptosuite\"\u003eSha256\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/kmackay/micro-ecc\"\u003euECC\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/kyuupichan/electrumx\"\u003eElectrumX\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/spesmilo/electrum\"\u003eElectrum Client\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\"\u003eLicense and Copyright\u003c/h2\u003e\u003ca id=\"user-content-license-and-copyright\" class=\"anchor\" aria-label=\"Permalink: License and Copyright\" href=\"#license-and-copyright\"\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=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"This code is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General\nPublic License version 3 only, as published by the Free Software Foundation.\n\nThis code is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied\nwarranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License\nversion 3 for more details (a copy is included in the LICENSE.md file that accompanied this code).\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eThis code is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General\nPublic License version 3 only, as published by the Free Software Foundation.\n\nThis code is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied\nwarranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License\nversion 3 for more details (a copy is included in the LICENSE.md file that accompanied this code).\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"Koyn: Bitcoin Library For Arduino ","anchor":"koyn-bitcoin-library-for-arduino-","htmlText":"Koyn: Bitcoin Library For Arduino "},{"level":2,"text":"Overview","anchor":"overview","htmlText":"Overview"},{"level":2,"text":"Readiness","anchor":"readiness","htmlText":"Readiness"},{"level":2,"text":"Light Clients","anchor":"light-clients","htmlText":"Light Clients"},{"level":2,"text":"Hardware Requirements","anchor":"hardware-requirements","htmlText":"Hardware Requirements"},{"level":2,"text":"Boards Support","anchor":"boards-support","htmlText":"Boards Support"},{"level":2,"text":"Installation","anchor":"installation","htmlText":"Installation"},{"level":2,"text":"Blockchain Headers Syncing","anchor":"blockchain-headers-syncing","htmlText":"Blockchain Headers Syncing"},{"level":2,"text":"Usage","anchor":"usage","htmlText":"Usage"},{"level":2,"text":"Supported Networks","anchor":"supported-networks","htmlText":"Supported Networks"},{"level":2,"text":"Examples","anchor":"examples","htmlText":"Examples"},{"level":2,"text":"Documentation","anchor":"documentation","htmlText":"Documentation"},{"level":2,"text":"Configuration And Defaults","anchor":"configuration-and-defaults","htmlText":"Configuration And Defaults"},{"level":2,"text":"Status and Roadmap","anchor":"status-and-roadmap","htmlText":"Status and Roadmap"},{"level":2,"text":"Notes and Caveats","anchor":"notes-and-caveats","htmlText":"Notes and Caveats"},{"level":2,"text":"Acquiring Testnet Bitcoins","anchor":"acquiring-testnet-bitcoins","htmlText":"Acquiring Testnet Bitcoins"},{"level":2,"text":"Changelog","anchor":"changelog","htmlText":"Changelog"},{"level":2,"text":"Contributing","anchor":"contributing","htmlText":"Contributing"},{"level":2,"text":"Learn More","anchor":"learn-more","htmlText":"Learn More"},{"level":2,"text":"Attributions and Credits","anchor":"attributions-and-credits","htmlText":"Attributions and Credits"},{"level":2,"text":"License and Copyright","anchor":"license-and-copyright","htmlText":"License and 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itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Koyn: Bitcoin Library For Arduino <a href="https://travis-ci.org/elkrem/koyn" rel="nofollow"><img src="https://camo.githubusercontent.com/9d729e0989626b75b9767efc3528ed2b8cc9fd1664e4bc553317bd2d5c2cd7da/68747470733a2f2f7472617669732d63692e6f72672f656c6b72656d2f6b6f796e2e7376673f6272616e63683d6d6173746572" alt="Build Status" data-canonical-src="https://travis-ci.org/elkrem/koyn.svg?branch=master" style="max-width: 100%;"></a></h1><a id="user-content-koyn-bitcoin-library-for-arduino-" class="anchor" aria-label="Permalink: Koyn: Bitcoin Library For Arduino " href="#koyn-bitcoin-library-for-arduino-"><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"><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">A fully decentralized and trustless Bitcoin light (aka SPV) client implementation for the Arduino platform based on Electrum protocol.</p> <p dir="auto">With its simple and easy-to-use API, it allows you to interface Arduino boards to the Bitcoin network. The sky is the limit, you can either do a physical action when a transaction is made or send transactions based on hardware events.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Readiness</h2><a id="user-content-readiness" class="anchor" aria-label="Permalink: Readiness" href="#readiness"><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 should be working but it is still rough around the edges. It is considered to be a <strong>work-in-progress</strong>. It is by all means far from being production ready. It hasn't been thoroughly tested or gone through security reviews.</p> <p dir="auto">Currently, it can only works with Bitcoin testnet <strong>(no mainnet support yet)</strong>. Be advised not to use real Bitcoins. We are not responsible for any loss of funds so use it at your own risk.</p> <p dir="auto">Arduino boards support is initially limited as well, please check below for more info.</p> <p dir="auto">Also, the public interface hasn't been finalized yet, it can be changed a bit during the initial releases.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Light Clients</h2><a id="user-content-light-clients" class="anchor" aria-label="Permalink: Light Clients" href="#light-clients"><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">Light Bitcoin clients (nodes) doesn't store the full transaction history (blockchain) of the network (unlike full clients). They only download the headers (80 bytes every ~10 minutes) of the created blocks to be able to verify that a particular transaction was indeed included and accepted by the network. The concept is often referred to by the term <em>SPV</em> (Simplified Payment Verification).</p> <p dir="auto">There are two popular protocols for SPV clients. Bitcoin Core and Electrum, they pretty much have the same concept. The core protocol works with raw bytes and Electrum is JSON based. This library supports only Electrum protocol for now, thus it only works with Electrum servers.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Hardware Requirements</h2><a id="user-content-hardware-requirements" class="anchor" aria-label="Permalink: Hardware Requirements" href="#hardware-requirements"><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 requires an ESP8266 or ESP32 based board connected with an SPI microSD card module to work.</p> <p dir="auto">The microSD card needs to be a single partition, FAT formatted, fast (class 10) and has at least 1GB of space. It doesn't need to be empty as we create a new directory on its root named <code>koyn</code>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Boards Support</h2><a id="user-content-boards-support" class="anchor" aria-label="Permalink: Boards Support" href="#boards-support"><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">These boards have been tested and are known to work:</p> <p dir="auto"><strong>ESP8266</strong></p> <ul dir="auto"> <li>Adafruit Huzzah ESP8266</li> <li>Wemos D1</li> <li>SparkFun ESP8266 Thing</li> <li>NodeMCU</li> </ul> <p dir="auto"><strong>ESP32</strong></p> <ul dir="auto"> <li>DOIT ESP32 DEVKIT V1</li> <li>ESPDUINO-32</li> <li>SparkFun ESP32 Thing</li> </ul> <p dir="auto">These microSD card boards has been tested and known to work:</p> <ul dir="auto"> <li>Wemos Micro SD Card Shield</li> <li>SparkFun microSD Shield</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Installation</h2><a id="user-content-installation" class="anchor" aria-label="Permalink: Installation" href="#installation"><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">Make sure you have the latest version of <a href="https://www.arduino.cc/en/Main/Software" rel="nofollow">Arduino IDE</a> with either <a href="https://github.com/esp8266/Arduino#installing-with-boards-manager">ESP8266</a> or <a href="https://github.com/espressif/arduino-esp32#installation-instructions">ESP32</a> cores installed.</p> <p dir="auto"><strong>Using Library Manager (Recommended)</strong></p> <p dir="auto">Open the Arduino IDE, go to Sketch > Include Library > Manage Libraries.</p> <p dir="auto">And then, search for our library in the list, pick the latest version and click install.</p> <p dir="auto"><strong>Manual Method</strong></p> <p dir="auto">Download the latest version of the library from the <a href="https://github.com/Elkrem/Koyn/releases">releases page</a>. Unzip it in a new directory named <em>Koyn</em> inside your Arduino's libraries directory.</p> <p dir="auto"><strong>PlatformIO</strong></p> <p dir="auto">If you are using PlatformIO, the library can be installed from their library manager as well, just search for <code>Koyn</code>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Blockchain Headers Syncing</h2><a id="user-content-blockchain-headers-syncing" class="anchor" aria-label="Permalink: Blockchain Headers Syncing" href="#blockchain-headers-syncing"><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">You can choose to sync and validate the headers on the board directly starting from the genesis block, but it can take from tens of minutes to hours depending on your sketch and network conditions.</p> <p dir="auto">So it is advised to preload the microSD card with the latest headers on a host machine before hand using one of the methods below, then rename it to <code>blkhdrs</code> and place it in <code>/koyn</code> directory on the microSD.</p> <p dir="auto"><strong>Using Our Tool (Recommended)</strong></p> <p dir="auto">We developed a command line tool based on <a href="https://github.com/bitcoinj/bitcoinj">BitcoinJ</a> library that validates and downloads the Bitcoin blockchain headers to a file on your local machine.</p> <p dir="auto">First make sure you have a <a href="https://java.com/en/download/" rel="nofollow">Java Runtime Environment</a> installed on your host machine and accessible from your <code>PATH</code>. Then download the latest <a href="https://github.com/elkrem/koyn-sync/releases">release</a> of our tool. Then run the executable or call <code>java -jar koyn-sync-VERSION.jar</code> from a command line terminal. (Make sure you are connected to the Internet, and the working directory is writable)</p> <p dir="auto">The tool will download the headers to your working directory and create either <code>./koyn/mainnet/blkhdrs</code> or <code>./koyn/testnet/blkhdrs</code> depending on the supplied <a href="https://github.com/elkrem/koyn-sync#optional-flags">flags</a>. (Logging messages will show its progress)</p> <p dir="auto"><strong>From Electrum Website</strong></p> <p dir="auto">If you trust Electrum.org, you can download the headers directly from their website and the library will sync the rest of the headers when started.</p> <ul dir="auto"> <li>Bitcoin <a href="https://download.electrum.org/testnet_headers" rel="nofollow">Testnet Headers</a> (till August, 2017)</li> <li>Bitcoin <a href="https://download.electrum.org/blockchain_headers" rel="nofollow">Mainnet Headers</a> (till August, 2017)</li> </ul> <p dir="auto"><strong>From Electrum App</strong></p> <p dir="auto">Install Electrum client on your machine if you don't have it, run it, let it sync.</p> <p dir="auto">You may need to supply <code>--testnet</code> parameter before running the Electrum executable if you need to sync the <strong>testnet</strong> headers.</p> <p dir="auto">On Windows, the headers file is located in <code>%APPDATA%\Electrum\blockchain_headers</code> or <code>%APPDATA%\Electrum\testnet\blockchain_headers</code> if you are using the testnet. On Mac and Linux, the headers file is located in <code>~/.electrum/blockchain_headers</code> or <code>~/.electrum/testnet/blockchain_headers</code> if you are using the testnet.</p> <p dir="auto">Note: Electrum versions >=3.1.0 <strong>does not</strong> sync the headers from the genesis block and rely on the concept of checkpoints. So to sync using Electrum please use version below 3.1.0.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Usage</h2><a id="user-content-usage" class="anchor" aria-label="Permalink: Usage" href="#usage"><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">We tried to make our API as simple as possible, here are some samples.</p> <p dir="auto"><strong>Bare Minimum</strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="#include "Koyn.h" void setup() { Koyn.begin(); } void loop() { Koyn.run(); }"><pre class="notranslate"><code>#include "Koyn.h" void setup() { Koyn.begin(); } void loop() { Koyn.run(); } </code></pre></div> <p dir="auto"><strong>Transaction Signing and Broadcasting</strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="BitcoinAddress myAddress("PRIVATE_KEY", KEY_PRIVATE); Koyn.trackAddress(&myAddress); BitcoinAddress myFriendAddress("BITCOIN_ADDRESS", ADDRESS_ENCODED); Koyn.spend(&myAddress, &myFriendAddress, 100000000, 100000);"><pre class="notranslate"><code>BitcoinAddress myAddress("PRIVATE_KEY", KEY_PRIVATE); Koyn.trackAddress(&myAddress); BitcoinAddress myFriendAddress("BITCOIN_ADDRESS", ADDRESS_ENCODED); Koyn.spend(&myAddress, &myFriendAddress, 100000000, 100000); </code></pre></div> <p dir="auto"><strong>Transactions Tracking</strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="void paymentCallback(BitcoinTransaction tx){ }"><pre class="notranslate"><code>void paymentCallback(BitcoinTransaction tx){ } </code></pre></div> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="Koyn.onNewTransaction(&paymentCallback); if(Koyn.isSynced()){ Koyn.trackAddress(&myAddress); }"><pre class="notranslate"><code>Koyn.onNewTransaction(&paymentCallback); if(Koyn.isSynced()){ Koyn.trackAddress(&myAddress); } </code></pre></div> <p dir="auto"><strong>Complete Example: Flash a light bulb with Bitcoin</strong></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="#include <Koyn.h> #define LIGHT_BULB 13 #define PAYMENT_VALUE 1000000 BitcoinAddress myAddress("PRIVATE_KEY", KEY_PRIVATE); BitcoinAddress myFriendAddress("BITCOIN_ADDRESS", ADDRESS_ENCODED); void setup() { pinMode(LIGHT_BULB, OUTPUT); .. .. Connect to WiFi .. Koyn.begin(false); Koyn.onNewTransaction(&paymentCallback); } void loop() { if(Koyn.isSynced()){ Koyn.trackAddress(&myAddress); } Koyn.run(); } void paymentCallback(BitcoinTransaction tx){ for(int i=0;i<tx.getInputsCount();i++) { BitcoinAddress from; tx.getInput(i, &from); if(from == myFriendAddress){ for(int j=0;j<tx.getOutputsCount();j++) { BitcoinAddress to; tx.getOutput(j, &to); if(to == myAddress){ if(tx.getOutputAmount(j) == PAYMENT_VALUE){ digitalWrite(LIGHT_BULB, HIGH); Koyn.delay(1000); digitalWrite(LIGHT_BULB, LOW); } else{ Koyn.spend(&myAddress, &myFriendAddress, tx.getOutputAmount(j), 100000); } break; } } break; } } }"><pre class="notranslate"><code>#include <Koyn.h> #define LIGHT_BULB 13 #define PAYMENT_VALUE 1000000 BitcoinAddress myAddress("PRIVATE_KEY", KEY_PRIVATE); BitcoinAddress myFriendAddress("BITCOIN_ADDRESS", ADDRESS_ENCODED); void setup() { pinMode(LIGHT_BULB, OUTPUT); .. .. Connect to WiFi .. Koyn.begin(false); Koyn.onNewTransaction(&paymentCallback); } void loop() { if(Koyn.isSynced()){ Koyn.trackAddress(&myAddress); } Koyn.run(); } void paymentCallback(BitcoinTransaction tx){ for(int i=0;i<tx.getInputsCount();i++) { BitcoinAddress from; tx.getInput(i, &from); if(from == myFriendAddress){ for(int j=0;j<tx.getOutputsCount();j++) { BitcoinAddress to; tx.getOutput(j, &to); if(to == myAddress){ if(tx.getOutputAmount(j) == PAYMENT_VALUE){ digitalWrite(LIGHT_BULB, HIGH); Koyn.delay(1000); digitalWrite(LIGHT_BULB, LOW); } else{ Koyn.spend(&myAddress, &myFriendAddress, tx.getOutputAmount(j), 100000); } break; } } break; } } } </code></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Supported Networks</h2><a id="user-content-supported-networks" class="anchor" aria-label="Permalink: Supported Networks" href="#supported-networks"><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 class="contains-task-list"> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Bitcoin Testnet</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Bitcoin Mainnet</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Bitcoin Cash</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Examples</h2><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">Examples that cover most of our APIs can be found <a href="/elkrem/koyn/blob/master/examples">here</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Documentation</h2><a id="user-content-documentation" class="anchor" aria-label="Permalink: Documentation" href="#documentation"><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">Documentation for all of the usable public methods, classes and configuration can be found in our <a href="https://github.com/elkrem/koyn/wiki/Docs">Wiki</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Configuration And Defaults</h2><a id="user-content-configuration-and-defaults" class="anchor" aria-label="Permalink: Configuration And Defaults" href="#configuration-and-defaults"><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">Most of the hardcoded library defaults and configuration parameters can be edited <a href="/elkrem/koyn/blob/master/src/Config.h">here</a>.</p> <p dir="auto">Debug messages can be enabled on the default Serial interface through the same file as well by uncommenting <code>#define ENABLE_DEBUG_MESSAGES</code> line.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Status and Roadmap</h2><a id="user-content-status-and-roadmap" class="anchor" aria-label="Permalink: Status and Roadmap" href="#status-and-roadmap"><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 class="contains-task-list"> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Connects to multiple Electrum servers.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Validates the headers one by one starting from the genesis block.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Downloads (syncs) the latest blockchain headers and validates them.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Track transactions to user's addresses.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Validates incoming transactions and making sure they were accepted by the network.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Sign and send transactions (from user's addresses) to the network.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Support headers checkpoints.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Support Bitcoin mainnet.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Support additional WiFi connected Arduino boards.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Support custom transactions.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Support P2SH transactions.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Support SegWit transactions and addresses.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Support hierarchical deterministic wallets (BIP32).</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Support mnemonic seed wallets (BIP39).</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Support logical hierarchy for deterministic wallets (BIP44).</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Add APIs to ease the workflow of payment channels.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Add APIs to ease the prototyping of hardware wallets.</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Notes and Caveats</h2><a id="user-content-notes-and-caveats" class="anchor" aria-label="Permalink: Notes and Caveats" href="#notes-and-caveats"><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>Only P2PKH transactions and addresses are supported.</li> <li>Only non-SegWit transactions and addresses are supported.</li> <li>Only addresses generated from compressed public keys are supported.</li> <li>The library connects to non-TLS Electrum servers only.</li> <li>The library connects to a hardcoded list of bootnodes only for now, the <code>server.peers.subscribe</code> call hasn't been implemented yet.</li> <li>The library works with Bitcoin testnet only for now.</li> <li>The library does cache private keys in memory.</li> <li>The library doesn't support true random generators yet (generated private keys and addresses rely on analog pin #0 noise).</li> <li>Due to the limitation of hardware, there are some constraints on transaction sizes, tracked addresses number, transactions number kept in memory and others (Their defaults can be overwritten in <code>Config.h</code> file)</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Acquiring Testnet Bitcoins</h2><a id="user-content-acquiring-testnet-bitcoins" class="anchor" aria-label="Permalink: Acquiring Testnet Bitcoins" href="#acquiring-testnet-bitcoins"><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">Testnet bitcoins can be easily acquired using online faucets like <a href="https://testnet.manu.backend.hamburg/faucet" rel="nofollow">this</a> and <a href="https://testnet.coinfaucet.eu/en/" rel="nofollow">this</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Changelog</h2><a id="user-content-changelog" class="anchor" aria-label="Permalink: Changelog" href="#changelog"><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 see what has changed in recent versions of Koyn library, see the <a href="/elkrem/koyn/blob/master/CHANGELOG.md">change log</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Contributing</h2><a id="user-content-contributing" class="anchor" aria-label="Permalink: Contributing" href="#contributing"><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">We welcome all contributions from our community. If you've find a bug or can improve the code or want to add a new feature, please follow our <a href="/elkrem/koyn/blob/master/CONTRIBUTING.md">contributions guidelines</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Learn More</h2><a id="user-content-learn-more" class="anchor" aria-label="Permalink: Learn More" href="#learn-more"><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">Be the first to know about our future blockchain connected hardware products by subscribing to our mailing list at <a href="https://elkrem.io" rel="nofollow">Elkrem.io</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Attributions and Credits</h2><a id="user-content-attributions-and-credits" class="anchor" aria-label="Permalink: Attributions and Credits" href="#attributions-and-credits"><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><a href="https://github.com/interactive-matter/aJson">aJson</a></li> <li><a href="https://github.com/HsuBokai/base58">Base58</a></li> <li><a href="https://github.com/squix78/json-streaming-parser">Json Streaming Parser</a></li> <li><a href="https://github.com/ARMmbed/mbedtls">Ripemd160</a></li> <li><a href="https://github.com/greiman/SdFat">SdFat</a></li> <li><a href="https://github.com/Cathedrow/Cryptosuite">Sha256</a></li> <li><a href="https://github.com/kmackay/micro-ecc">uECC</a></li> <li><a href="https://github.com/kyuupichan/electrumx">ElectrumX</a></li> <li><a href="https://github.com/spesmilo/electrum">Electrum Client</a></li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">License and Copyright</h2><a id="user-content-license-and-copyright" class="anchor" aria-label="Permalink: License and Copyright" href="#license-and-copyright"><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="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="This code is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 3 only, as published by the Free Software Foundation. This code is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License version 3 for more details (a copy is included in the LICENSE.md file that accompanied this code)."><pre class="notranslate"><code>This code is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 3 only, as published by the Free Software Foundation. This code is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License version 3 for more details (a copy is included in the LICENSE.md file that accompanied this code). </code></pre></div> </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="H/3yNxNG03Aww85XayOY6tp6v8YkYNd6YcEUbmCYwDPjZvuZ8D7aDOXlenUr61i0j+K6UDHr2Mo/Z2H9XKpYTQ==" /> </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"> A trustless and decentralized Bitcoin library for Arduino compatible boards </p> <h3 class="sr-only">Topics</h3> <div class="my-3"> <div class="f6"> <a href="/topics/arduino" title="Topic: arduino" data-view-component="true" class="topic-tag topic-tag-link"> arduino </a> <a 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aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-note mr-2"> <path d="M0 3.75C0 2.784.784 2 1.75 2h12.5c.966 0 1.75.784 1.75 1.75v8.5A1.75 1.75 0 0 1 14.25 14H1.75A1.75 1.75 0 0 1 0 12.25Zm1.75-.25a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h12.5a.25.25 0 0 0 .25-.25v-8.5a.25.25 0 0 0-.25-.25ZM3.5 6.25a.75.75 0 0 1 .75-.75h7a.75.75 0 0 1 0 1.5h-7a.75.75 0 0 1-.75-.75Zm.75 2.25h4a.75.75 0 0 1 0 1.5h-4a.75.75 0 0 1 0-1.5Z"></path> </svg> <span class="color-fg-muted">Custom properties</span></a> </div> <h3 class="sr-only">Stars</h3> <div class="mt-2"> <a href="/elkrem/koyn/stargazers" data-view-component="true" class="Link Link--muted"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-star mr-2"> <path d="M8 .25a.75.75 0 0 1 .673.418l1.882 3.815 4.21.612a.75.75 0 0 1 .416 1.279l-3.046 2.97.719 4.192a.751.751 0 0 1-1.088.791L8 12.347l-3.766 1.98a.75.75 0 0 1-1.088-.79l.72-4.194L.818 6.374a.75.75 0 0 1 .416-1.28l4.21-.611L7.327.668A.75.75 0 0 1 8 .25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path> </svg> <strong>66</strong> stars</a> </div> <h3 class="sr-only">Watchers</h3> <div class="mt-2"> <a href="/elkrem/koyn/watchers" data-view-component="true" class="Link Link--muted"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-eye mr-2"> <path d="M8 2c1.981 0 3.671.992 4.933 2.078 1.27 1.091 2.187 2.345 2.637 3.023a1.62 1.62 0 0 1 0 1.798c-.45.678-1.367 1.932-2.637 3.023C11.67 13.008 9.981 14 8 14c-1.981 0-3.671-.992-4.933-2.078C1.797 10.83.88 9.576.43 8.898a1.62 1.62 0 0 1 0-1.798c.45-.677 1.367-1.931 2.637-3.022C4.33 2.992 6.019 2 8 2ZM1.679 7.932a.12.12 0 0 0 0 .136c.411.622 1.241 1.75 2.366 2.717C5.176 11.758 6.527 12.5 8 12.5c1.473 0 2.825-.742 3.955-1.715 1.124-.967 1.954-2.096 2.366-2.717a.12.12 0 0 0 0-.136c-.412-.621-1.242-1.75-2.366-2.717C10.824 4.242 9.473 3.5 8 3.5c-1.473 0-2.825.742-3.955 1.715-1.124.967-1.954 2.096-2.366 2.717ZM8 10a2 2 0 1 1-.001-3.999A2 2 0 0 1 8 10Z"></path> </svg> <strong>13</strong> watching</a> </div> <h3 class="sr-only">Forks</h3> <div class="mt-2"> <a href="/elkrem/koyn/forks" data-view-component="true" class="Link Link--muted"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-2"> <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Z"></path> </svg> <strong>19</strong> forks</a> </div> <div class="mt-2"> <a class="Link--muted" href="/contact/report-content?content_url=https%3A%2F%2Fgithub.com%2Felkrem%2Fkoyn&report=elkrem+%28user%29"> Report repository </a> </div> </div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame"> <a href="/elkrem/koyn/releases" data-view-component="true" class="Link--primary no-underline Link">Releases <span title="2" data-view-component="true" class="Counter">2</span></a></h2> <a class="Link--primary d-flex no-underline" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" href="/elkrem/koyn/releases/tag/v0.2.0"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-tag flex-shrink-0 mt-1 color-fg-success"> <path d="M1 7.775V2.75C1 1.784 1.784 1 2.75 1h5.025c.464 0 .91.184 1.238.513l6.25 6.25a1.75 1.75 0 0 1 0 2.474l-5.026 5.026a1.75 1.75 0 0 1-2.474 0l-6.25-6.25A1.752 1.752 0 0 1 1 7.775Zm1.5 0c0 .066.026.13.073.177l6.25 6.25a.25.25 0 0 0 .354 0l5.025-5.025a.25.25 0 0 0 0-.354l-6.25-6.25a.25.25 0 0 0-.177-.073H2.75a.25.25 0 0 0-.25.25ZM6 5a1 1 0 1 1 0 2 1 1 0 0 1 0-2Z"></path> </svg> <div class="ml-2 min-width-0"> <div class="d-flex"> <span class="css-truncate css-truncate-target text-bold mr-2" style="max-width: none;">v0.2.0</span> <span title="Label: Latest" data-view-component="true" class="Label Label--success flex-shrink-0"> Latest </span> </div> <div class="text-small color-fg-muted"><relative-time datetime="2018-08-09T17:05:51Z" class="no-wrap">Aug 9, 2018</relative-time></div> </div> </a> <div data-view-component="true" class="mt-3"> <a text="small" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" href="/elkrem/koyn/releases" data-view-component="true" class="Link">+ 1 release</a></div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/orgs/elkrem/packages?repo_name=koyn" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center">Packages <span title="0" hidden="hidden" data-view-component="true" class="Counter ml-1">0</span></a></h2> <div class="text-small color-fg-muted" > No packages published <br> </div> </div> </div> <div class="BorderGrid-row" hidden> <div class="BorderGrid-cell"> <include-fragment src="/elkrem/koyn/used_by_list" accept="text/fragment+html"> </include-fragment> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/elkrem/koyn/graphs/contributors" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center">Contributors <span title="2" data-view-component="true" class="Counter 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!important;;width: 13.0%;" itemprop="keywords" data-view-component="true" class="Progress-item color-bg-success-emphasis"></span> <span style="background-color:#dbb284 !important;;width: 7.4%;" itemprop="keywords" data-view-component="true" class="Progress-item color-bg-success-emphasis"></span> </span></div> <ul class="list-style-none"> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/elkrem/koyn/search?l=c%2B%2B" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#f34b7d;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">C++</span> <span>79.6%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline 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position-absolute right-0 top-0" type="button" aria-label="Close dialog" data-close-dialog> <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 class="octocat-spinner my-6 js-details-dialog-spinner"></div> </details-dialog> </details> </template> <div class="Popover js-hovercard-content position-absolute" style="display: none; outline: none;"> <div class="Popover-message Popover-message--bottom-left Popover-message--large Box color-shadow-large" style="width:360px;"> </div> </div> <template id="snippet-clipboard-copy-button"> <div class="zeroclipboard-container position-absolute right-0 top-0"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn js-clipboard-copy m-2 p-0" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon m-2"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none m-2"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> <template id="snippet-clipboard-copy-button-unpositioned"> <div class="zeroclipboard-container"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn btn-invisible js-clipboard-copy m-2 p-0 d-flex flex-justify-center flex-items-center" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> </div> <div id="js-global-screen-reader-notice" class="sr-only mt-n1" aria-live="polite" aria-atomic="true" ></div> <div id="js-global-screen-reader-notice-assertive" class="sr-only mt-n1" aria-live="assertive" aria-atomic="true"></div> </body> </html>