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attribution-reporting-api/AGGREGATE.md at main · WICG/attribution-reporting-api · GitHub
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registration","anchor":"attribution-source-registration","htmlText":"Attribution source registration"},{"level":3,"text":"Attribution trigger registration","anchor":"attribution-trigger-registration","htmlText":"Attribution trigger registration"},{"level":3,"text":"Aggregatable reports","anchor":"aggregatable-reports","htmlText":"Aggregatable reports"},{"level":4,"text":"Encrypted payload","anchor":"encrypted-payload","htmlText":"Encrypted payload"},{"level":3,"text":"Optional: transitional debugging reports","anchor":"optional-transitional-debugging-reports","htmlText":"Optional: transitional debugging reports"},{"level":4,"text":"Attribution-success debugging reports","anchor":"attribution-success-debugging-reports","htmlText":"Attribution-success debugging reports"},{"level":4,"text":"Verbose debugging reports","anchor":"verbose-debugging-reports","htmlText":"Verbose debugging reports"},{"level":3,"text":"Contribution bounding and budgeting","anchor":"contribution-bounding-and-budgeting","htmlText":"Contribution bounding and budgeting"},{"level":3,"text":"Storage limits","anchor":"storage-limits","htmlText":"Storage limits"},{"level":3,"text":"Hide the true number of attribution reports","anchor":"hide-the-true-number-of-attribution-reports","htmlText":"Hide the true number of attribution reports"},{"level":3,"text":"Optional: reduce report delay with trigger context ID","anchor":"optional-reduce-report-delay-with-trigger-context-id","htmlText":"Optional: reduce report delay with trigger context ID"},{"level":3,"text":"Optional: flexible contribution filtering with filtering IDs","anchor":"optional-flexible-contribution-filtering-with-filtering-ids","htmlText":"Optional: flexible contribution filtering with filtering IDs"},{"level":3,"text":"Optional: named budgets","anchor":"optional-named-budgets","htmlText":"Optional: named budgets"},{"level":2,"text":"Data processing through a Secure Aggregation Service","anchor":"data-processing-through-a-secure-aggregation-service","htmlText":"Data processing through a Secure Aggregation Service"},{"level":2,"text":"Privacy considerations","anchor":"privacy-considerations","htmlText":"Privacy considerations"},{"level":3,"text":"Differential Privacy","anchor":"differential-privacy","htmlText":"Differential Privacy"},{"level":3,"text":"Rate limits","anchor":"rate-limits","htmlText":"Rate limits"},{"level":2,"text":"Ideas for future iteration","anchor":"ideas-for-future-iteration","htmlText":"Ideas for future iteration"},{"level":3,"text":"Worklet-based aggregation key generation","anchor":"worklet-based-aggregation-key-generation","htmlText":"Worklet-based aggregation key generation"},{"level":3,"text":"Custom attribution models","anchor":"custom-attribution-models","htmlText":"Custom attribution models"},{"level":3,"text":"More advanced contribution bounding","anchor":"more-advanced-contribution-bounding","htmlText":"More advanced contribution bounding"},{"level":3,"text":"Choosing among aggregation services","anchor":"choosing-among-aggregation-services","htmlText":"Choosing among aggregation services"},{"level":2,"text":"Considered alternatives","anchor":"considered-alternatives","htmlText":"Considered alternatives"},{"level":3,"text":"“Count” vs. “value” histograms","anchor":"count-vs-value-histograms","htmlText":"“Count” vs. “value” histograms"},{"level":3,"text":"Binary report format","anchor":"binary-report-format","htmlText":"Binary report format"}],"lineInfo":{"truncatedLoc":"837","truncatedSloc":"677"},"mode":"file"},"image":false,"isCodeownersFile":null,"isPlain":false,"isValidLegacyIssueTemplate":false,"issueTemplate":null,"discussionTemplate":null,"language":"Markdown","languageID":222,"large":false,"planSupportInfo":{"repoIsFork":null,"repoOwnedByCurrentUser":null,"requestFullPath":"/WICG/attribution-reporting-api/blob/main/AGGREGATE.md","showFreeOrgGatedFeatureMessage":null,"showPlanSupportBanner":null,"upgradeDataAttributes":null,"upgradePath":null},"publishBannersInfo":{"dismissActionNoticePath":"/settings/dismiss-notice/publish_action_from_dockerfile","releasePath":"/WICG/attribution-reporting-api/releases/new?marketplace=true","showPublishActionBanner":false},"rawBlobUrl":"https://github.com/WICG/attribution-reporting-api/raw/refs/heads/main/AGGREGATE.md","renderImageOrRaw":false,"richText":"\u003carticle class=\"markdown-body entry-content container-lg\" itemprop=\"text\"\u003e\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAttribution Reporting API with Aggregatable Reports\u003c/h1\u003e\u003ca id=\"user-content-attribution-reporting-api-with-aggregatable-reports\" class=\"anchor\" aria-label=\"Permalink: Attribution Reporting API with Aggregatable Reports\" href=\"#attribution-reporting-api-with-aggregatable-reports\"\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\n\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eTable of Contents\u003c/strong\u003e\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#authors\"\u003eAuthors\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#introduction\"\u003eIntroduction\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#goals\"\u003eGoals\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#api-changes\"\u003eAPI changes\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#attribution-source-registration\"\u003eAttribution source registration\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#attribution-trigger-registration\"\u003eAttribution trigger registration\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#aggregatable-reports\"\u003eAggregatable reports\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#encrypted-payload\"\u003eEncrypted payload\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#optional-transitional-debugging-reports\"\u003eOptional: transitional debugging reports\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#attribution-success-debugging-reports\"\u003eAttribution-success debugging reports\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#verbose-debugging-reports\"\u003eVerbose debugging reports\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#contribution-bounding-and-budgeting\"\u003eContribution bounding and budgeting\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#storage-limits\"\u003eStorage limits\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#hide-the-true-number-of-attribution-reports\"\u003eHide the true number of attribution reports\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#optional-reduce-report-delay-with-trigger-context-id\"\u003eOptional: reduce report delay with trigger context ID\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#optional-flexible-contribution-filtering-with-filtering-ids\"\u003eOptional: flexible contribution filtering with filtering IDs\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#optional-named-budgets\"\u003eOptional: named budgets\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#data-processing-through-a-secure-aggregation-service\"\u003eData processing through a Secure Aggregation Service\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#privacy-considerations\"\u003ePrivacy considerations\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#differential-privacy\"\u003eDifferential Privacy\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#ideas-for-future-iteration\"\u003eIdeas for future iteration\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#worklet-based-aggregation-key-generation\"\u003eWorklet-based aggregation key generation\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#custom-attribution-models\"\u003eCustom attribution models\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#more-advanced-contribution-bounding\"\u003eMore advanced contribution bounding\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#choosing-among-aggregation-services\"\u003eChoosing among aggregation services\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#considered-alternatives\"\u003eConsidered alternatives\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#count-vs-value-histograms\"\u003e“Count” vs. “value” histograms\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#binary-report-format\"\u003eBinary report format\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAuthors\u003c/h2\u003e\u003ca id=\"user-content-authors\" class=\"anchor\" aria-label=\"Permalink: Authors\" href=\"#authors\"\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=\"mailto:csharrison@chromium.org\"\u003ecsharrison@chromium.org\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"mailto:johnidel@chromium.org\"\u003ejohnidel@chromium.org\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"mailto:marianar@google.com\"\u003emarianar@google.com\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\"\u003eIntroduction\u003c/h2\u003e\u003ca id=\"user-content-introduction\" class=\"anchor\" aria-label=\"Permalink: Introduction\" href=\"#introduction\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis document proposes extensions to our existing \u003ca href=\"https://github.com/WICG/attribution-reporting-api\"\u003eAttribution Reporting\nAPI\u003c/a\u003e that reports\nevent-level data. The intention is to provide a mechanism for rich metadata to\nbe reported in aggregate, to better support use-cases such as campaign-level\nperformance reporting or conversion values.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGoals\u003c/h2\u003e\u003ca id=\"user-content-goals\" class=\"anchor\" aria-label=\"Permalink: Goals\" href=\"#goals\"\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\"\u003eAggregatable attribution reports should support legitimate measurement use cases\nnot already supported by the event-level reports. These include:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eHigher fidelity measurement of attribution-trigger (conversion-side) data,\nwhich is very limited in event-level attribution reports, including the\nability to sum \u003cem\u003evalues\u003c/em\u003e rather than just counts\u003c/li\u003e\n\u003cli\u003eA system which enables the most robust privacy protections\u003c/li\u003e\n\u003cli\u003eAbility to receive aggregatable reports alongside event-level reports\u003c/li\u003e\n\u003cli\u003eAbility to receive data at a faster rate than with event-level reports\u003c/li\u003e\n\u003cli\u003eGreater flexibility to trade off attribution-trigger (conversion-side) data,\nreporting rate and accuracy.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eNote: fraud detection (enabling the filtration of reports you are not expecting)\nis a goal but it is left out of scope for this document for now.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAPI changes\u003c/h2\u003e\u003ca id=\"user-content-api-changes\" class=\"anchor\" aria-label=\"Permalink: API changes\" href=\"#api-changes\"\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 client API for creating contributions to an aggregate report uses the same\nAPI base as for event level reports with a few extensions. In the following\nexample an ad-tech will use the API to collect:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAggregate conversion counts at a per-campaign level\u003c/li\u003e\n\u003cli\u003eAggregate purchase values at a per geo level\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAttribution source registration\u003c/h3\u003e\u003ca id=\"user-content-attribution-source-registration\" class=\"anchor\" aria-label=\"Permalink: Attribution source registration\" href=\"#attribution-source-registration\"\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\"\u003eRegistering sources eligible for aggregate reporting entails adding a new\n\u003ccode\u003eaggregation_keys\u003c/code\u003e dictionary field to the JSON dictionary of the\n\u003ca href=\"https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#registering-attribution-sources\"\u003e\u003ccode\u003eAttribution-Reporting-Register-Source\u003c/code\u003e header\u003c/a\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n ... // existing fields, such as `source_event_id` and `destination`\n\n \u0026quot;aggregation_keys\u0026quot;: {\n // Generates a \u0026quot;0x159\u0026quot; key piece (low order bits of the key) for the key named\n // \u0026quot;campaignCounts\u0026quot;.\n \u0026quot;campaignCounts\u0026quot;: \u0026quot;0x159\u0026quot;, // User saw ad from campaign 345 (out of 511)\n\n // Generates a \u0026quot;0x5\u0026quot; key piece (low order bits of the key) for the key named \u0026quot;geoValue\u0026quot;.\n \u0026quot;geoValue\u0026quot;: \u0026quot;0x5\u0026quot; // Source-side geo region = 5 (US), out of a possible ~100 regions\n },\n\n \u0026quot;aggregatable_report_window\u0026quot;: \u0026quot;86400\u0026quot;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n ... \u003cspan class=\"pl-c\"\u003e// existing fields, such as `source_event_id` and `destination`\u003c/span\u003e\n\n \u003cspan class=\"pl-s\"\u003e\"aggregation_keys\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Generates a \"0x159\" key piece (low order bits of the key) for the key named\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// \"campaignCounts\".\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"campaignCounts\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"0x159\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// User saw ad from campaign 345 (out of 511)\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Generates a \"0x5\" key piece (low order bits of the key) for the key named \"geoValue\".\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"geoValue\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"0x5\"\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Source-side geo region = 5 (US), out of a possible ~100 regions\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\n \u003cspan class=\"pl-s\"\u003e\"aggregatable_report_window\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"86400\"\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis defines a dictionary of named aggregation keys, each with a piece of the\naggregation key defined as a hex-string. The final histogram bucket key will be\nfully defined at trigger time using a combination (binary OR) of this piece and\ntrigger-side pieces.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFinal keys will be restricted to a maximum of 128 bits. This means that hex\nstrings in the JSON must be limited to at most 32 digits.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThere is also a new optional field, \u003ccode\u003eaggregatable_report_window\u003c/code\u003e, which is the duration\nin seconds after source registration during which aggregatable reports may be created\nfor this source.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAttribution trigger registration\u003c/h3\u003e\u003ca id=\"user-content-attribution-trigger-registration\" class=\"anchor\" aria-label=\"Permalink: Attribution trigger registration\" href=\"#attribution-trigger-registration\"\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\"\u003eTrigger registration will also add two new fields to the JSON dictionary of the\n\u003ca href=\"https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#triggering-attribution\"\u003e\u003ccode\u003eAttribution-Reporting-Register-Trigger\u003c/code\u003e\nheader\u003c/a\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n ... // existing fields, such as `event_trigger_data`\n\n \u0026quot;aggregatable_trigger_data\u0026quot;: [\n // Each dict independently adds pieces to multiple source keys.\n {\n // Conversion type purchase = 2 at a 9 bit offset, i.e. 2 \u0026lt;\u0026lt; 9.\n // A 9 bit offset is needed because there are 511 possible campaigns, which\n // will take up 9 bits in the resulting key.\n \u0026quot;key_piece\u0026quot;: \u0026quot;0x400\u0026quot;,\n // Apply this key piece to:\n \u0026quot;source_keys\u0026quot;: [\u0026quot;campaignCounts\u0026quot;]\n },\n {\n // Purchase category shirts = 21 at a 7 bit offset, i.e. 21 \u0026lt;\u0026lt; 7.\n // A 7 bit offset is needed because there are ~100 regions for the geo key,\n // which will take up 7 bits of space in the resulting key.\n \u0026quot;key_piece\u0026quot;: \u0026quot;0xA80\u0026quot;,\n // Apply this key piece to:\n \u0026quot;source_keys\u0026quot;: [\u0026quot;geoValue\u0026quot;, \u0026quot;nonMatchingKeyIdsIgnored\u0026quot;]\n }\n ],\n \u0026quot;aggregatable_values\u0026quot;: {\n // Each source event can contribute a maximum of L1 = 2^16 to the aggregate\n // histogram. In this example, use this whole budget on a single trigger,\n // evenly allocating this \u0026quot;budget\u0026quot; across two measurements. Note that this\n // will require rescaling when post-processing aggregates!\n\n // 1 count = L1 / 2 = 2^15\n \u0026quot;campaignCounts\u0026quot;: 32768,\n\n // Purchase was for $52. The site's max value is $1024.\n // $1 = (L1 / 2) / 1024.\n // $52 = 52 * (L1 / 2) / 1024 = 1664\n \u0026quot;geoValue\u0026quot;: 1664\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n ... \u003cspan class=\"pl-c\"\u003e// existing fields, such as `event_trigger_data`\u003c/span\u003e\n\n \u003cspan class=\"pl-s\"\u003e\"aggregatable_trigger_data\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Each dict independently adds pieces to multiple source keys.\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Conversion type purchase = 2 at a 9 bit offset, i.e. 2 \u0026lt;\u0026lt; 9.\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// A 9 bit offset is needed because there are 511 possible campaigns, which\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// will take up 9 bits in the resulting key.\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"key_piece\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"0x400\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Apply this key piece to:\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"source_keys\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"campaignCounts\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Purchase category shirts = 21 at a 7 bit offset, i.e. 21 \u0026lt;\u0026lt; 7.\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// A 7 bit offset is needed because there are ~100 regions for the geo key,\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// which will take up 7 bits of space in the resulting key.\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"key_piece\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"0xA80\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Apply this key piece to:\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"source_keys\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"geoValue\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"nonMatchingKeyIdsIgnored\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"aggregatable_values\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Each source event can contribute a maximum of L1 = 2^16 to the aggregate\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// histogram. In this example, use this whole budget on a single trigger,\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// evenly allocating this \"budget\" across two measurements. Note that this\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// will require rescaling when post-processing aggregates!\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// 1 count = L1 / 2 = 2^15\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"campaignCounts\"\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e32768\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Purchase was for $52. The site's max value is $1024.\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// $1 = (L1 / 2) / 1024.\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// $52 = 52 * (L1 / 2) / 1024 = 1664\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"geoValue\"\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e1664\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eaggregatable_trigger_data\u003c/code\u003e field is a list of dict which generates\naggregation keys.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eaggregatable_values\u003c/code\u003e field lists an amount of an abstract \"value\" to\ncontribute to each key, which can be integers in [1, 2\u003csup\u003e16\u003c/sup\u003e]. These are attached\nto aggregation keys in the order they are generated. See the \u003ca href=\"#contribution-bounding-and-budgeting\"\u003econtribution\nbudgeting\u003c/a\u003e section for more details on how\nto allocate these contribution values.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe scheme above will generate the following abstract histogram contributions:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"[\n// campaignCounts\n{\n key: 0x559, // = 0x159 | 0x400\n value: 32768\n},\n// geoValue:\n{\n key: 0xA85, // = 0x5 | 0xA80\n value: 1664\n}]\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// campaignCounts\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ekey\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e0x559\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// = 0x159 | 0x400\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003evalue\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e32768\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// geoValue:\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ekey\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e0xA85\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// = 0x5 | 0xA80\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003evalue\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e1664\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote: the above scheme was used to maximize the \u003ca href=\"#contribution-bounding-and-budgeting\"\u003econtribution\nbudget\u003c/a\u003e and optimize utility in the face\nof constant noise. To rescale, simply inverse the scaling factors used above:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-python notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"L1 = 1 \u0026lt;\u0026lt; 16\ntrue_agg_campaign_counts = raw_agg_campaign_counts / (L1 / 2)\ntrue_agg_geo_value = 1024 * raw_agg_geo_value / (L1 / 2)\"\u003e\u003cpre\u003e\u003cspan class=\"pl-v\"\u003eL1\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u0026lt;\u0026lt;\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e16\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003etrue_agg_campaign_counts\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eraw_agg_campaign_counts\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e/\u003c/span\u003e (\u003cspan class=\"pl-v\"\u003eL1\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e/\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e)\n\u003cspan class=\"pl-s1\"\u003etrue_agg_geo_value\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1024\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eraw_agg_geo_value\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e/\u003c/span\u003e (\u003cspan class=\"pl-v\"\u003eL1\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e/\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e)\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote: The \u003ccode\u003efilters\u003c/code\u003e field will still apply to aggregatable reports, and each\ndict in \u003ccode\u003eaggregatable_trigger_data\u003c/code\u003e can still optionally have filters applied\nto it just like for event-level reports.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote: The \u003ccode\u003eaggregatable_values\u003c/code\u003e field may also be specified as a list of\ndictionaries, where each dictionary contains a dictionary \u003ccode\u003evalues\u003c/code\u003e of key-value\npairs as outlined above as well as optional \u003ccode\u003efilters\u003c/code\u003e and \u003ccode\u003enot_filters\u003c/code\u003e fields,\nallowing trigger registrations to customize how values are contributed to keys\ndepending on source filter data. If multiple list entries have filters that\nmatch the source's filters, only the first entry and its corresponding values\nwill be used.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor example:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n ...,\n \u0026quot;aggregatable_values\u0026quot;: [\n {\n \u0026quot;values\u0026quot;: {\n \u0026quot;campaignCounts\u0026quot;: 32768,\n \u0026quot;geoValue\u0026quot;: 1664\n },\n \u0026quot;filters\u0026quot;: {\u0026quot;source_type\u0026quot;: [\u0026quot;navigation\u0026quot;]}\n }\n ]\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n ...\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"aggregatable_values\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"values\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"campaignCounts\"\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e32768\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"geoValue\"\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e1664\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"filters\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"source_type\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"navigation\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTrigger registration will accept an optional field\n\u003ccode\u003eaggregatable_deduplication_keys\u003c/code\u003e which will be used to deduplicate multiple\ntriggers containing the same \u003ccode\u003ededuplication_key\u003c/code\u003e for a single source with selective filtering.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n ...\n \u0026quot;aggregatable_deduplication_keys\u0026quot;: [\n {\n \u0026quot;deduplication_key\u0026quot;: \u0026quot;[unsigned 64-bit integer]\u0026quot;,\n \u0026quot;filters\u0026quot;: {\u0026quot;source_type\u0026quot;: [\u0026quot;navigation\u0026quot;]}\n }\n ]\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n ...\n \u003cspan class=\"pl-s\"\u003e\"aggregatable_deduplication_keys\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"deduplication_key\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"[unsigned 64-bit integer]\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"filters\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"source_type\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"navigation\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe browser will create aggregatable reports for a source only if the trigger's\n\u003ccode\u003eaggregatable_deduplication_key\u003c/code\u003e has not already been associated with an\naggregatable report for that source.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote that aggregatable trigger registration is independent of event-level\ntrigger registration.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAggregatable reports\u003c/h3\u003e\u003ca id=\"user-content-aggregatable-reports\" class=\"anchor\" aria-label=\"Permalink: Aggregatable reports\" href=\"#aggregatable-reports\"\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\"\u003eAggregatable reports will look very similar to event-level reports. They will be\nreported via HTTP POST to the reporting origin at the path\n\u003ccode\u003e.well-known/attribution-reporting/report-aggregate-attribution\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe report itself does not contain histogram contributions in the clear. Rather,\nthe report embeds them in an \u003cem\u003eencrypted payload\u003c/em\u003e that can only be read by a\ntrusted aggregation service known by the browser.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe report will be JSON encoded with the following scheme:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n // Info that the aggregation services also need encoded in JSON\n // for use with AEAD.\n \u0026quot;shared_info\u0026quot;: \u0026quot;{\\\u0026quot;api\\\u0026quot;:\\\u0026quot;attribution-reporting\\\u0026quot;,\\\u0026quot;attribution_destination\\\u0026quot;:\\\u0026quot;https://advertiser.example\\\u0026quot;,\\\u0026quot;report_id\\\u0026quot;:\\\u0026quot;[UUID]\\\u0026quot;,\\\u0026quot;reporting_origin\\\u0026quot;:\\\u0026quot;https://reporter.example\\\u0026quot;,\\\u0026quot;scheduled_report_time\\\u0026quot;:\\\u0026quot;[timestamp in seconds]\\\u0026quot;,\\\u0026quot;source_registration_time\\\u0026quot;:\\\u0026quot;[timestamp in seconds]\\\u0026quot;,\\\u0026quot;version\\\u0026quot;:\\\u0026quot;[api version]\\\u0026quot;}\u0026quot;,\n\n // Support a list of payloads for future extensibility if multiple helpers\n // are necessary. Currently only supports a single helper configured\n // by the browser.\n \u0026quot;aggregation_service_payloads\u0026quot;: [\n {\n \u0026quot;payload\u0026quot;: \u0026quot;[base64-encoded HPKE encrypted data readable only by the aggregation service]\u0026quot;,\n \u0026quot;key_id\u0026quot;: \u0026quot;[string identifying public key used to encrypt payload]\u0026quot;,\n\n // Optional debugging information, if cookie-based debugging is allowed.\n \u0026quot;debug_cleartext_payload\u0026quot;: \u0026quot;[base64-encoded unencrypted payload]\u0026quot;,\n },\n ],\n\n // The deployment option for the aggregation service.\n \u0026quot;aggregation_coordinator_origin\u0026quot;: \u0026quot;https://publickeyservice.msmt.aws.privacysandboxservices.com\u0026quot;,\n\n // Optional debugging information (also present in event-level reports),\n // if cookie-based debugging is allowed.\n \u0026quot;source_debug_key\u0026quot;: \u0026quot;[64 bit unsigned integer]\u0026quot;,\n \u0026quot;trigger_debug_key\u0026quot;: \u0026quot;[64 bit unsigned integer]\u0026quot;,\n\n // Optional trigger context ID.\n \u0026quot;trigger_context_id\u0026quot;: \u0026quot;example string\u0026quot;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Info that the aggregation services also need encoded in JSON\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// for use with AEAD.\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"shared_info\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"{\\\"api\\\":\\\"attribution-reporting\\\",\\\"attribution_destination\\\":\\\"https://advertiser.example\\\",\\\"report_id\\\":\\\"[UUID]\\\",\\\"reporting_origin\\\":\\\"https://reporter.example\\\",\\\"scheduled_report_time\\\":\\\"[timestamp in seconds]\\\",\\\"source_registration_time\\\":\\\"[timestamp in seconds]\\\",\\\"version\\\":\\\"[api version]\\\"}\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Support a list of payloads for future extensibility if multiple helpers\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// are necessary. Currently only supports a single helper configured\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// by the browser.\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"aggregation_service_payloads\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"payload\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"[base64-encoded HPKE encrypted data readable only by the aggregation service]\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"key_id\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"[string identifying public key used to encrypt payload]\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Optional debugging information, if cookie-based debugging is allowed.\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"debug_cleartext_payload\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"[base64-encoded unencrypted payload]\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// The deployment option for the aggregation service.\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"aggregation_coordinator_origin\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"https://publickeyservice.msmt.aws.privacysandboxservices.com\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Optional debugging information (also present in event-level reports),\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// if cookie-based debugging is allowed.\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"source_debug_key\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"[64 bit unsigned integer]\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"trigger_debug_key\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"[64 bit unsigned integer]\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Optional trigger context ID.\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"trigger_context_id\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"example string\"\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eReports will not be delayed to the same extent as they are for event level\nreports. The browser will delay them with a random delay between 0 to 10\nminutes, or with a small delay after the browser next starts up.\nThe browser is free to utilize techniques like retries to minimize data loss.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eshared_info\u003c/code\u003e will be a serialized JSON object. This exact string is used\nas authenticated data for decryption, see \u003ca href=\"#encrypted-payload\"\u003ebelow\u003c/a\u003e. The\nstring therefore must be forwarded to the aggregation service unmodified. The\nreporting origin can parse the string to access the encoded fields.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eapi\u003c/code\u003e field is a string enum identifying the API that triggered the report.\nThis allows the aggregation service to extend support to other APIs in the future.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003escheduled_report_time\u003c/code\u003e will be the number of seconds since the Unix Epoch\n(1970-01-01T00:00:00Z, ignoring leap seconds) to align with\n\u003ca href=\"https://heycam.github.io/webidl/#DOMTimeStamp\" rel=\"nofollow\"\u003eDOMTimestamp\u003c/a\u003e until the\nbrowser initially scheduled the report to be sent (to avoid noise around\noffline devices reporting late).\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003esource_registration_time\u003c/code\u003e will represent (in seconds since the Unix Epoch) the\ntime the source event was registered, rounded down to a whole day.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003epayload\u003c/code\u003e will contain the actual histogram contributions. It should be be\nencrypted and then base64 encoded, see \u003ca href=\"#encrypted-payload\"\u003ebelow\u003c/a\u003e.\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eOptional debugging fields are discussed \u003ca href=\"#attribution-success-debugging-reports\"\u003ebelow\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eEncrypted payload\u003c/h4\u003e\u003ca id=\"user-content-encrypted-payload\" class=\"anchor\" aria-label=\"Permalink: Encrypted payload\" href=\"#encrypted-payload\"\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 \u003ccode\u003epayload\u003c/code\u003e should be a \u003ca href=\"https://cbor.io\" rel=\"nofollow\"\u003eCBOR\u003c/a\u003e map encrypted via\n\u003ca href=\"https://datatracker.ietf.org/doc/draft-irtf-cfrg-hpke/\" rel=\"nofollow\"\u003eHPKE\u003c/a\u003e and then base64\nencoded. The map will have the following structure:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// CBOR\n{\n \u0026quot;operation\u0026quot;: \u0026quot;histogram\u0026quot;, // Allows for the service to support other operations in the future\n \u0026quot;data\u0026quot;: [{\n \u0026quot;bucket\u0026quot;: \u0026lt;bucket, encoded as a 16-byte (i.e. 128-bit) big-endian bytestring\u0026gt;,\n \u0026quot;value\u0026quot;: \u0026lt;value, encoded as a 4-byte (i.e. 32-bit) big-endian bytestring\u0026gt;,\n // k is equal to the value `aggregatable_filtering_id_max_bytes`, defaults to 1 (i.e. 8-bit).\n \u0026quot;id\u0026quot;: \u0026lt;filtering ID, encoded as a k-byte big-endian bytestring, defaults to 0\u0026gt;\n }, ...]\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// CBOR\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"operation\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"histogram\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Allows for the service to support other operations in the future\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"data\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"bucket\"\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ebucket\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eencoded\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eas\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ea\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e16\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e-\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ebyte\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ei\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e128\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e-\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ebit\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ebig-endian\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ebytestring\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u0026gt;\u003c/span\u003e,\n \"value\": \u003cspan class=\"pl-c1\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eencoded\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eas\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ea\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e4\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e-\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ebyte\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ei\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ee\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e32\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e-\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ebit\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ebig-endian\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ebytestring\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u0026gt;\u003c/span\u003e,\n // k is equal to the value `aggregatable_filtering_id_max_bytes`, defaults to 1 (i.e. 8-bit).\n \"id\": \u003cspan class=\"pl-c1\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003efiltering\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eID\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eencoded\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eas\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ea\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ek-byte\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ebig-endian\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ebytestring\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003edefaults\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eto\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u0026gt;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e ...\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe browser may encode multiple contributions in the same payload; this is only\npossible if all other fields in the report/payload are identical for the\ncontributions. To avoid revealing the number of contributions in the payload\nthrough its encrypted size, the browser should pad the list of payloads with\n'null' (zero value) contributions up to the maximum. In the future, a more\ndirect padding scheme could be considered.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis encryption should use \u003ca href=\"https://en.wikipedia.org/wiki/Authenticated_encryption\" rel=\"nofollow\"\u003eAEAD\u003c/a\u003e\nto ensure that the information in \u003ccode\u003eshared_info\u003c/code\u003e is not tampered with, since the\naggregation service will need that information to do proper replay protection.\nThe authenticated data will consist of the \u003ccode\u003eshared_info\u003c/code\u003e string (encoded as\nUTF-8) with a constant prefix added for domain separation, i.e. to avoid\nciphertexts being reused for different protocols, even if public keys are\nshared.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe encryption will use public keys specified by the aggregation service. The\nbrowser will encrypt payloads just before the report is sent by fetching the\npublic key endpoint (the aggregation service coordinator origin at the path\n\u003ccode\u003e/.well-known/aggregation-service/v1/public-keys\u003c/code\u003e) with an un-credentialed request. The processing origin will\nrespond with a set of keys which will be stored according to standard HTTP\ncaching rules, i.e. using Cache-Control headers to dictate how long to store the\nkeys for (e.g. following the \u003ca href=\"https://datatracker.ietf.org/doc/html/rfc7234#section-4.2\" rel=\"nofollow\"\u003efreshness\nlifetime\u003c/a\u003e). The\nbrowser could enforce maximum/minimum lifetimes of stored keys to encourage\nfaster key rotation and/or mitigate bandwidth usage. The scheme of the JSON\nencoded public keys is as follows:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n \u0026quot;keys\u0026quot;: [\n {\n \u0026quot;id\u0026quot;: \u0026quot;[arbitrary string identifying the key (up to 128 characters)]\u0026quot;,\n \u0026quot;key\u0026quot;: \u0026quot;[base64 encoded public key]\u0026quot;\n },\n // Optionally, more keys.\n ]\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"keys\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"id\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"[arbitrary string identifying the key (up to 128 characters)]\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"key\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"[base64 encoded public key]\"\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Optionally, more keys.\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote: The version in the \u003ccode\u003e.well-known\u003c/code\u003e path may be updated in the future\nversions of the spec if the public key serving details change, especially in a\nbackwards incompatible way.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo limit the impact of a single compromised key, multiple keys (up to a small\nlimit) can be provided. The browser should independently pick a key uniformly at\nrandom for each payload it encrypts to avoid associating different reports.\nAdditionally, a public key endpoint should not reuse an ID string for a\ndifferent key. In particular, IDs must be unique within a single response to be\nvalid. In the case of backwards incompatible changes to this scheme (e.g. in\nfuture versions of the API), the endpoint URL should also change.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eNote:\u003c/strong\u003e The browser may need some mechanism to ensure that the same set of\nkeys are delivered to different users.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOptional: transitional debugging reports\u003c/h3\u003e\u003ca id=\"user-content-optional-transitional-debugging-reports\" class=\"anchor\" aria-label=\"Permalink: Optional: transitional debugging reports\" href=\"#optional-transitional-debugging-reports\"\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\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAttribution-success debugging reports\u003c/h4\u003e\u003ca id=\"user-content-attribution-success-debugging-reports\" class=\"anchor\" aria-label=\"Permalink: Attribution-success debugging reports\" href=\"#attribution-success-debugging-reports\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf \u003ca href=\"https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#attribution-success-debugging-reports\"\u003edebugging\u003c/a\u003e\nis enabled, additional debug fields will be present in aggregatable reports.\nThe \u003ccode\u003esource_debug_key\u003c/code\u003e and \u003ccode\u003etrigger_debug_key\u003c/code\u003e fields match those in the\nevent-level reports. If both the source and trigger debug keys are set, there\nwill be a \u003ccode\u003edebug_cleartext_payload\u003c/code\u003e field included in the report. It will\ncontain the base64-encoded cleartext of the encrypted payload to allow downstream\nsystems to verify that reports are constructed correctly. If both debug keys are\nset, the \u003ccode\u003eshared_info\u003c/code\u003e will also include the flag \u003ccode\u003e\"debug_mode\": \"enabled\"\u003c/code\u003e to\nallow the aggregation service to support debugging functionality on these reports.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAdditionally, a duplicate debug report will be sent immediately (i.e. without the\nrandom delay) to a\n\u003ccode\u003e.well-known/attribution-reporting/debug/report-aggregate-attribution\u003c/code\u003e endpoint.\nThe debug reports should be almost identical to the normal reports, including the\nadditional debug fields. However, the \u003ccode\u003epayload\u003c/code\u003e ciphertext will differ due to\nrepeating the encryption operation and the \u003ccode\u003ekey_id\u003c/code\u003e may differ if the previous\nkey had since expired or the browser randomly chose a different valid public key.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eVerbose debugging reports\u003c/h4\u003e\u003ca id=\"user-content-verbose-debugging-reports\" class=\"anchor\" aria-label=\"Permalink: Verbose debugging reports\" href=\"#verbose-debugging-reports\"\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\"\u003eAs outlined in the\n\u003ca href=\"https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#verbose-debugging-reports\"\u003eevent-level explainer\u003c/a\u003e,\ncertain aggregate attribution failures can be monitored as well.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eContribution bounding and budgeting\u003c/h3\u003e\u003ca id=\"user-content-contribution-bounding-and-budgeting\" class=\"anchor\" aria-label=\"Permalink: Contribution bounding and budgeting\" href=\"#contribution-bounding-and-budgeting\"\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\"\u003eEach attribution can make multiple contributions to an underlying aggregate\nhistogram, and a given user can trigger multiple attributions for a particular\nsource / trigger site pair. Our goal in this section is to \u003cem\u003ebound\u003c/em\u003e the\ncontributions any source event can make to a histogram.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis bound is characterized by a single parameters: \u003ccode\u003eL1\u003c/code\u003e, the maximum sum of the\ncontributions (values) across all buckets for a given source event. L1 refers to\nthe L1 sensitivity / norm of the histogram contributions per source event.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eExceeding these limits will cause future contributions to silently drop.\u003cbr\u003e\nWhile exposing failure in any kind of error interface can be used to leak\nsensitive information, we might be able to reveal aggregate failure results via\nsome other monitoring side channel in the future.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor the initial proposal, set \u003ccode\u003eL1 = 65536\u003c/code\u003e. Note that for privacy, this\nparameter can be arbitrary, as noise in the aggregation service will be scaled\nin proportion to this parameter. In the example above, the budget is split\nequally between two keys, one for the number of conversions per campaign and the\nother representing the conversion dollar value per geography. This budgeting\nmechanism is highly flexible and can support many different aggregation\nstrategies as long as the appropriate scaling is performed on the outputs.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe browser also applies a limit on the number of contributions within a single\nreport.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eStrawman: There should be a limit of 20 contributions per aggregatable report.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eStorage limits\u003c/h3\u003e\u003ca id=\"user-content-storage-limits\" class=\"anchor\" aria-label=\"Permalink: Storage limits\" href=\"#storage-limits\"\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 browser may apply storage limits in order to prevent excessive resource\nusage.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eStrawman: There should be a limit of 1024 pending aggregatable reports per\ndestination site.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote: The storage limits for event-level and aggregatable reports are enforced\nindependently of each other.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHide the true number of attribution reports\u003c/h3\u003e\u003ca id=\"user-content-hide-the-true-number-of-attribution-reports\" class=\"anchor\" aria-label=\"Permalink: Hide the true number of attribution reports\" href=\"#hide-the-true-number-of-attribution-reports\"\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 presence or absence of an attribution report leaks some potentially\nsensitive cross-site data in the current design. Therefore, revealing the total\ncount of reports to the reporting origin could leak something sensitive as well\n(imagine if the reporting origin only ever registered a conversion or impression\nfor a single user).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo hide the true number of reports, the browser will add noise to the number of\nreports by randomly sending noisy null reports for some fraction of trigger\nregistrations. Null reports will not check or affect rate limits.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAs a lot of the cross site information is embedded in the source registration\ntime, trigger registration will accept an optional field\n\u003ccode\u003eaggregatable_source_registration_time\u003c/code\u003e to allow developers to specify whether\nto exclude or include \u003ccode\u003esource_registration_time\u003c/code\u003e field within \u003ccode\u003eshared_info\u003c/code\u003e in the\naggregatable report. The null report rate will need to be higher if\n\u003ccode\u003esource_registration_time\u003c/code\u003e is present in the aggregatable report.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n ...,\n \u0026quot;aggregatable_trigger_data\u0026quot;: ...,\n \u0026quot;aggregatable_values\u0026quot;: ...,\n \u0026quot;aggregatable_source_registration_time\u0026quot;: \u0026quot;exclude\u0026quot; // or \u0026quot;include\u0026quot;, defaults to \u0026quot;exclude\u0026quot; if not present\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n ...\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"aggregatable_trigger_data\"\u003c/span\u003e: ...\u003cspan class=\"pl-s1\"\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"aggregatable_values\"\u003c/span\u003e: ...\u003cspan class=\"pl-s1\"\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"aggregatable_source_registration_time\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"exclude\"\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// or \"include\", defaults to \"exclude\" if not present\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eStrawman: There should be ~0.05 reports (in expectation) sent for trigger\nregistrations that exclude the \u003ccode\u003esource_registration_time\u003c/code\u003e field, and ~0.25 reports for\nthose that include this field.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn order to limit abuse of the protections above, there will be a maximum limit of 20 aggregatable reports per source.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOptional: reduce report delay with trigger context ID\u003c/h3\u003e\u003ca id=\"user-content-optional-reduce-report-delay-with-trigger-context-id\" class=\"anchor\" aria-label=\"Permalink: Optional: reduce report delay with trigger context ID\" href=\"#optional-reduce-report-delay-with-trigger-context-id\"\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\"\u003eTrigger registration will accept an optional string field \u003ccode\u003etrigger_context_id\u003c/code\u003e, a\nhigh-entropy ID that represents the data associated with the trigger.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n ..., // existing fields\n \u0026quot;trigger_context_id\u0026quot;: \u0026quot;example string\u0026quot; // max length 64\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n ...\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// existing fields\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"trigger_context_id\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"example string\"\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// max length 64\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis ID will be embedded unencrypted in the aggregatable report.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo avoid leaking cross-site information through the count of reports with the\ngiven ID, the browser will unconditionally send an aggregatable report on every\ntrigger registration with a trigger context ID. A null report will be sent in the\ncase that the trigger registration did not generate an attribution report. The\nsource registration time will always be excluded from the aggregatable report\nwith a trigger context ID.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAs the trigger context ID in the aggregatable report explicitly reveals the\nassociation between the report and the trigger, these reports can be sent\nimmediately without delay.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote: This is an \u003ca href=\"https://github.com/WICG/attribution-reporting-api/blob/main/report_verification.md#could-we-just-tag-reports-with-a-trigger_id-instead-of-using-anonymous-tokens\"\u003ealternative\u003c/a\u003e\nconsidered for \u003ca href=\"https://github.com/WICG/attribution-reporting-api/blob/main/report_verification.md\"\u003ereport verification\u003c/a\u003e,\nand achieves all of the higher priority \u003ca href=\"https://github.com/WICG/attribution-reporting-api/blob/main/report_verification.md#security-goals\"\u003esecurity goals\u003c/a\u003e.\nA similar design was proposed for the\n\u003ca href=\"https://github.com/patcg-individual-drafts/private-aggregation-api/blob/main/report_verification.md#shared-storage\"\u003ePrivate Aggregation API\u003c/a\u003e\nfor the purpose of report verification.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOptional: flexible contribution filtering with filtering IDs\u003c/h3\u003e\u003ca id=\"user-content-optional-flexible-contribution-filtering-with-filtering-ids\" class=\"anchor\" aria-label=\"Permalink: Optional: flexible contribution filtering with filtering IDs\" href=\"#optional-flexible-contribution-filtering-with-filtering-ids\"\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\"\u003eTrigger registration's \u003ccode\u003eaggregatable_values\u003c/code\u003e's values can be integers or\ndictionaries with an optional \u003ccode\u003efiltering_id\u003c/code\u003e field.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n ..., // existing fields\n \u0026quot;aggregatable_filtering_id_max_bytes\u0026quot;: 2, // defaults to 1\n \u0026quot;aggregatable_values\u0026quot;: {\n \u0026quot;campaignCounts\u0026quot;: 32768,\n \u0026quot;geoValue\u0026quot;: {\n \u0026quot;value\u0026quot;: 1664,\n \u0026quot;filtering_id\u0026quot;: \u0026quot;23\u0026quot; // must fit within \u0026lt;aggregatable_filtering_id_max_bytes\u0026gt; bytes\n }\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n ...\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// existing fields\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"aggregatable_filtering_id_max_bytes\"\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// defaults to 1\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"aggregatable_values\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"campaignCounts\"\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e32768\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"geoValue\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"value\"\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e1664\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"filtering_id\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"23\"\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// must fit within \u0026lt;aggregatable_filtering_id_max_bytes\u0026gt; bytes\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThese IDs will be included in the encrypted aggregatable report payload\ncontributions.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eQueries to the aggregation service can provide a list of allowed filtering IDs\nand all contributions with non-allowed IDs will be filtered out.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe filtering IDs need to be unsigned integers limited to a small number of\nbytes, (1 byte = 8 bits) by default. We limit the size of the ID space to\nprevent unnecessarily increasing the payload size and thus storage and\nprocessing costs.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis size can be increased via the \u003ccode\u003eaggregatable_filtering_id_max_bytes\u003c/code\u003e field.\nTo avoid amplifying a counting attack due to the resulting different payload\nsize, the browser will unconditionally send an aggregatable report on every\ntrigger registration with a non-default (greater than 1) max bytes. A null report\nwill be sent in the case that the trigger registration did not generate an\nattribution report. The source registration time will always be excluded from\nthe aggregatable report with a non-default max bytes. This behavior is the same\nas when a trigger context ID is set.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSee \u003ca href=\"https://github.com/patcg-individual-drafts/private-aggregation-api/blob/main/flexible_filtering.md\"\u003eflexible_filtering.md\u003c/a\u003e for more details.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOptional: named budgets\u003c/h3\u003e\u003ca id=\"user-content-optional-named-budgets\" class=\"anchor\" aria-label=\"Permalink: Optional: named budgets\" href=\"#optional-named-budgets\"\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\"\u003eNamed budgets is an optional feature that gives API callers the ability\nto manage \u003ccode\u003eL1\u003c/code\u003e contribution budget distribution across different types of\nattributions, addressing common challenges such as:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAllocating the privacy budget between different types of attributions\n(e.g., biddable vs. non-biddable).\u003c/li\u003e\n\u003cli\u003eDistributing the budget across multiple product categories to prevent any\nsingle product category from consuming all available privacy budget.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"#attribution-source-registration\"\u003eSource registrations\u003c/a\u003e will accept an optional\nfield \u003ccode\u003enamed_budgets\u003c/code\u003e, which is a dictionary used to set the\nmaximum contribution for each named budget for this source.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n ..., // existing fields\n \u0026quot;named_budgets\u0026quot;: {\n \u0026quot;budgetName1\u0026quot;: 32768, // Max contribution budget for budgetName1.\n \u0026quot;budgetName2\u0026quot;: 32768 // Max contribution budget for budgetName2.\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n ...\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// existing fields\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"named_budgets\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"budgetName1\"\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e32768\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Max contribution budget for budgetName1.\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"budgetName2\"\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e32768\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Max contribution budget for budgetName2.\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"#attribution-trigger-registration\"\u003eTrigger registrations\u003c/a\u003e will accept an\noptional field \u003ccode\u003enamed_budgets\u003c/code\u003e, which will be used to select the\nnamed budget for the generated aggregatable report.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n ..., // existing fields\n \u0026quot;named_budgets\u0026quot;: [\n {\n \u0026quot;name\u0026quot;: \u0026quot;budgetName1\u0026quot;,\n \u0026quot;filters\u0026quot;: {\u0026quot;source_type\u0026quot;: [\u0026quot;navigation\u0026quot;]}\n }\n ]\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n ...\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// existing fields\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"named_budgets\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"name\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"budgetName1\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"filters\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"source_type\"\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"navigation\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe first named budget from the trigger that matches the source's filter data\nwill be selected. If there is no budget name specified or no matching filters, the\n\u003ccode\u003eL1\u003c/code\u003e contribution budget will still be applied.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhen generating an aggregatable report, in addition to performing the\ncurrent \u003ccode\u003eL1\u003c/code\u003e budget limit check, the contributions for the report will\nbe checked against the available budget with the selected budget name, if applicable.\nIf the budget is insufficient, the aggregatable report will not be generated.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eData processing through a Secure Aggregation Service\u003c/h2\u003e\u003ca id=\"user-content-data-processing-through-a-secure-aggregation-service\" class=\"anchor\" aria-label=\"Permalink: Data processing through a Secure Aggregation Service\" href=\"#data-processing-through-a-secure-aggregation-service\"\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 exact design of the service is not specified here. We expect to have more\ninformation on the data flow from reporter → processing origins shortly, but\nwhat follows is a high-level summary.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAs the browser sends individual aggregatable reports to the reporting origin,\nthe reporting origin organizes them into\n\u003ca href=\"/WICG/attribution-reporting-api/blob/main/AGGREGATION_SERVICE_TEE.md#disjoint-batches\"\u003ebatches\u003c/a\u003e. The adtech can then send these\nbatches to the aggregation service.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe aggregation service will aggregate reports within a certain batch, and\nrespond back with a summary report (aggregate histogram), i.e. a list of keys with associated\n\u003cem\u003eaggregate\u003c/em\u003e values. It is expected that as a privacy protection mechanism, a\ncertain amount of noise will be added to each output key's aggregate value.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCurrently the aggregation service can be deployed on Amazon Web Services (AWS) and\nGoogle Cloud Platform (GCP). We expect to support other cloud providers in the future. See the \u003ca href=\"https://github.com/privacysandbox/protected-auction-services-docs/blob/main/public_cloud_tees.md\"\u003ePublic Cloud TEE requirements explainer\u003c/a\u003e for more details.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTrigger registration will accept an optional string field \u003ccode\u003eaggregation_coordinator_origin\u003c/code\u003e\nto allow developers to specify the deployment option for the aggregation service\nsupported by the browser, e.g. the origin for the aggregation service deployed on\nAWS, GCP, and other platforms in the future.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n ..., // existing fields\n \u0026quot;aggregation_coordinator_origin\u0026quot;: \u0026quot;https://publickeyservice.msmt.aws.privacysandboxservices.com\u0026quot;,\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n ...\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// existing fields\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"aggregation_coordinator_origin\"\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"https://publickeyservice.msmt.aws.privacysandboxservices.com\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSee \u003ca href=\"https://github.com/WICG/attribution-reporting-api/blob/main/aggregation_coordinator_origin_allowlist.md\"\u003eallowlist\u003c/a\u003e\nof the aggregation service coordinator origins.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePrivacy considerations\u003c/h2\u003e\u003ca id=\"user-content-privacy-considerations\" class=\"anchor\" aria-label=\"Permalink: Privacy considerations\" href=\"#privacy-considerations\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis proposal introduces a new set of reports to the API. Alone they do not add\nmuch meaningful cross-site information, so they are fairly benign. However, they\ncontain encrypted payloads which allow aggregate histograms to be computed.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThese histograms should be protected with various techniques with a trusted\nserver system. For example, it is expected that the histograms will be subject\nto noise proportional to the \u003ccode\u003eL1\u003c/code\u003e budget. Additionally, most rate-limits (except\nfor the maximum number of reports per source) used for event-level reports will\nalso be enforced for aggregatable reports, which limit the total amount of\ninformation that can be sent out for any one user.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eServers will need to be implemented such that browsers can trust them with\nsensitive cross-site data. There are various technologies and techniques that\ncould be employed (e.g. \u003ca href=\"https://en.wikipedia.org/wiki/Trusted_execution_environment\" rel=\"nofollow\"\u003eTrusted Execution\nEnvironments\u003c/a\u003e,\n\u003ca href=\"https://en.wikipedia.org/wiki/Secure_multi-party_computation\" rel=\"nofollow\"\u003eMulti-party-computation\u003c/a\u003e,\naudits, etc) that could satisfy browsers that data is safely aggregated and the\noutput maintains proper privacy.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDifferential Privacy\u003c/h3\u003e\u003ca id=\"user-content-differential-privacy\" class=\"anchor\" aria-label=\"Permalink: Differential Privacy\" href=\"#differential-privacy\"\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 goal of this work is to have a framework which can support differentially\nprivate aggregate measurement. In principle this can be achieved if the\naggregation service adds noise proportional to the \u003ccode\u003eL1\u003c/code\u003e budget in principle,\ne.g. noise distributed according to Laplace(L1/epsilon) should achieve epsilon\ndifferential privacy. With small enough values of epsilon, reports for a given\nsource will be well-protected in an aggregate release.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote: there are a few caveats about a formal differential privacy claim:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eThe scope of privacy in the current design is not user-level, but per-source.\nSee \u003ca href=\"#more-advanced-contribution-bounding\"\u003eMore advanced contribution\nbounding\u003c/a\u003e for follow-up work exploring\ntightening this.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eOur plan is to adjust the level of noise added based on feedback during the\norigin trial period, and our goal with this initial version is to create a\nfoundation for further exploration into formally private methods for\naggregation.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRate limits\u003c/h3\u003e\u003ca id=\"user-content-rate-limits\" class=\"anchor\" aria-label=\"Permalink: Rate limits\" href=\"#rate-limits\"\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\"\u003eVarious rate limits outlined in the\n\u003ca href=\"https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#reporting-cooldown--rate-limits\"\u003eevent-level explainer\u003c/a\u003e\nshould also apply to aggregatable reports. The limits should be shared across\nall types of reports.\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eIdeas for future iteration\u003c/h2\u003e\u003ca id=\"user-content-ideas-for-future-iteration\" class=\"anchor\" aria-label=\"Permalink: Ideas for future iteration\" href=\"#ideas-for-future-iteration\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWorklet-based aggregation key generation\u003c/h3\u003e\u003ca id=\"user-content-worklet-based-aggregation-key-generation\" class=\"anchor\" aria-label=\"Permalink: Worklet-based aggregation key generation\" href=\"#worklet-based-aggregation-key-generation\"\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\"\u003eAt trigger time, we could have a\n\u003ca href=\"https://developer.mozilla.org/en-US/docs/Web/API/Worklet\" rel=\"nofollow\"\u003eworklet-style\u003c/a\u003e API\nthat allows passing in an arbitrary string of “trigger context” that specifies\ninformation about the trigger event (e.g. high fidelity data about a\nconversion). From within the worklet, code can access both the source and\ntrigger context in the same function to generate an aggregate report. This\nallows for more dynamic keys than a declarative API (like the existing\u003ca href=\"https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#triggering-attribution\"\u003e\nHTTP-based\ntriggering\u003c/a\u003e),\nbut disallows exfiltrating sensitive cross-site data out of the worklet.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe worklet is used to generate histogram contributions, which are key-value\npairs of integers. Note that there will be some maximum number of keys (e.g.\n2^128 keys).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe following code triggers attribution by invoking a worklet.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"await window.attributionReporting.worklet.addModule(\n \u0026quot;https://reporter.example/convert.js\u0026quot;);\n\n// The first argument should match the origin of the module we are invoking, and\n// determines the scope of attribution similar to the existing HTTP-based API,\n// i.e. it should match the \u0026quot;attributionreportto\u0026quot; attribute.\n// The last argument needs to match what AggregateAttributionReporter uses upon\n// calling registerAggregateReporter\nwindow.attributionReporting.triggerAttribution(\u0026quot;https://reporter.example\u0026quot;, \n \u0026lt;triggerContextStr\u0026gt;, \u0026quot;my-aggregate-reporter\u0026quot;);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003ewindow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eattributionReporting\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eworklet\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eaddModule\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"https://reporter.example/convert.js\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// The first argument should match the origin of the module we are invoking, and\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// determines the scope of attribution similar to the existing HTTP-based API,\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// i.e. it should match the \"attributionreportto\" attribute.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// The last argument needs to match what AggregateAttributionReporter uses upon\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// calling registerAggregateReporter\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003ewindow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eattributionReporting\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003etriggerAttribution\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"https://reporter.example\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \n \u003cspan class=\"pl-c1\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003etriggerContextStr\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u0026gt;\u003c/span\u003e, \"my-aggregate-reporter\");\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eInternally, the browser will look up to see which source should be attributed,\nsimilar to how\n\u003ca href=\"https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#trigger-attribution-algorithm\"\u003eattribution\u003c/a\u003e\nworks in the HTTP-based API. Note here that only a single source will be\nmatched.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHere is \u003ccode\u003econvert.js\u003c/code\u003e which crafts an aggregate report.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"class AggregateAttributionReporter {\n // attributionSourceContext set as \u0026quot;\u0026lt;campaignid\u0026gt;,\u0026lt;geoid\u0026gt;\u0026quot;\n processAggregate(triggerContext, attributionSourceContext, sourceType) {\n let [campaign, geo] = attributionSourceContext.split(',').map(\n x =\u0026gt; parseInt(x, 10))\n \n let purchaseValue = parseInt(triggerContext, 10)\n \n histogramContributions = [\n {key: campaign, value: purchaseValue},\n {key: geo, value: purchaseValue},\n ];\n return {\n histogramContributions: histogramContributions,\n }\n }\n}\n\n// Bound classes will be invoked when an attribution triggered on this document\n// is successfully attributed to a source whose reporting origin matches the\n// worklet origin.\nregisterAggregateReporter(\u0026quot;my-aggregate-reporter\u0026quot;, AggregateAttributionReporter);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eAggregateAttributionReporter\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// attributionSourceContext set as \"\u0026lt;campaignid\u0026gt;,\u0026lt;geoid\u0026gt;\"\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eprocessAggregate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003etriggerContext\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eattributionSourceContext\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esourceType\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ecampaign\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003egeo\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eattributionSourceContext\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003esplit\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e','\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003emap\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003ex\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eparseInt\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003epurchaseValue\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eparseInt\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003etriggerContext\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \n \u003cspan class=\"pl-s1\"\u003ehistogramContributions\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ekey\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003ecampaign\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003evalue\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003epurchaseValue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ekey\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003egeo\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003evalue\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003epurchaseValue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ehistogramContributions\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003ehistogramContributions\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Bound classes will be invoked when an attribution triggered on this document\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// is successfully attributed to a source whose reporting origin matches the\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// worklet origin.\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eregisterAggregateReporter\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"my-aggregate-reporter\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eAggregateAttributionReporter\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis worklet approach provides greatly enhanced flexibility at the cost of\ncomplexity. It introduces a new security / privacy boundary, and there are\nseveral edge cases that must be handled carefully to avoid data loss (e.g. the\ndocument being destroyed while the worklet is processing, unless a\n\u003ccode\u003ekeepalive\u003c/code\u003e-style mode for worklets is introduced). These issues must be solved\nbefore this design could be considered.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCustom attribution models\u003c/h3\u003e\u003ca id=\"user-content-custom-attribution-models\" class=\"anchor\" aria-label=\"Permalink: Custom attribution models\" href=\"#custom-attribution-models\"\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 worklet based scheme possibly allows for more flexible attribution options,\nincluding specifying partial “credit” for multiple previous attribution sources\nthat would provide value to advertisers that are interested in attribution\nmodels other than last-touch.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWe should be careful in allowing reports to include cross site information from\nmultiple sites, as it could increase the risk of cross site tracking.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMore advanced contribution bounding\u003c/h3\u003e\u003ca id=\"user-content-more-advanced-contribution-bounding\" class=\"anchor\" aria-label=\"Permalink: More advanced contribution bounding\" href=\"#more-advanced-contribution-bounding\"\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 might want to consider bounding contribution at levels other than the source\nevent level in the future for more robust privacy protection. For instance, we\ncould bound user contributions per trigger event, or even by {source site,\ndestination site, day} for a more user-level bound.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis would likely come at the cost of some utility and complexity, as budgeting\nacross multiple source events may not be straightforward.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAdditionally, there are more sophisticated techniques that can optimize utility\nand privacy if we bound more than just the L1 norm of the aggregate histogram.\nFor instance, we could impose a stricter Linf bound (i.e. bounding the\ncontribution to any one bucket). Care should be taken to ensure that either:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eA proper compromise is met across various use-cases\u003c/li\u003e\n\u003cli\u003eWe can support multiple types of contribution bounding for different reporting\norigins without introducing privacy leaks\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eSee \u003ca href=\"https://github.com/WICG/attribution-reporting-api/issues/249\" data-hovercard-type=\"issue\" data-hovercard-url=\"/WICG/attribution-reporting-api/issues/249/hovercard\"\u003eissue 249\u003c/a\u003e\nfor more details.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eChoosing among aggregation services\u003c/h3\u003e\u003ca id=\"user-content-choosing-among-aggregation-services\" class=\"anchor\" aria-label=\"Permalink: Choosing among aggregation services\" href=\"#choosing-among-aggregation-services\"\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 server can add an optional \u003ccode\u003ealternative_aggregation_mode\u003c/code\u003e string field:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-httpspec notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Attribution-Reporting-Register-Trigger: {..., \u0026quot;aggregatable_trigger_data\u0026quot;: ..., \u0026quot;aggregatable_values\u0026quot;: ..., \u0026quot;alternative_aggregation_mode\u0026quot;: \u0026quot;experimental-poplar\u0026quot;}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-v\"\u003eAttribution-Reporting-Register-Trigger:\u003c/span\u003e {..., \"aggregatable_trigger_data\": ..., \"aggregatable_values\": ..., \"alternative_aggregation_mode\": \"experimental-poplar\"}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe optional field will allow developers to choose among different options for\naggregation infrastructure supported by the user agent. This value will allow\nexperimentation with new technologies, and allows us to try out new approaches\nwithout interfering with core functionality provided by the default option. The\n\u003ccode\u003e\"experimental-poplar\"\u003c/code\u003e option will implement a protocol similar to\n\u003ca href=\"https://github.com/cfrg/draft-irtf-cfrg-vdaf/blob/main/draft-irtf-cfrg-vdaf.md#poplar1-poplar1\"\u003epoplar VDAF\u003c/a\u003e\nin the \u003ca href=\"https://datatracker.ietf.org/doc/draft-gpew-priv-ppm/\" rel=\"nofollow\"\u003ePPM Framework\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eConsidered alternatives\u003c/h2\u003e\u003ca id=\"user-content-considered-alternatives\" class=\"anchor\" aria-label=\"Permalink: Considered alternatives\" href=\"#considered-alternatives\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e“Count” vs. “value” histograms\u003c/h3\u003e\u003ca id=\"user-content-count-vs-value-histograms\" class=\"anchor\" aria-label=\"Permalink: “Count” vs. “value” histograms\" href=\"#count-vs-value-histograms\"\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\"\u003eThere are some use-cases which require something close to binary input (i.e.\ncounting conversions), and other conversions which require summing in some\ndiscretized domain (e.g. summing conversion value).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor simplicity in this API we are treating these exactly the same. Count-based\napproaches could do something like submitting two possible values, 0 for 0 and\nMAX_VALUE for 1, and consider the large space to be just a discretized domain\nof fractions between 0 and 1.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis has the benefit of keeping the aggregation infrastructure generic and\navoids the need to “tag” different reports with whether they represent a\ncoarse-grained or fine-grained value.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn the end, we will use this MAX_VALUE to scale noise via computing the\nsensitivity of the computation, so submitting “1” for counts will yield more\nnoise than otherwise expected.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBinary report format\u003c/h3\u003e\u003ca id=\"user-content-binary-report-format\" class=\"anchor\" aria-label=\"Permalink: Binary report format\" href=\"#binary-report-format\"\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 binary report format like CBOR could streamline AEAD authentication by passing\nraw bytes directly to the reporting origin, which could be passed through\ndirectly to an aggregation service. This design would avoid parsing /\nserialization errors in constructing authenticated data necessary to decrypt the\npayload.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHowever, binary formats are not as familiar to developers, so there is an\nergonomics tradeoff to be made here.\u003c/p\u003e\n\u003c/article\u003e","renderedFileInfo":null,"shortPath":null,"symbolsEnabled":true,"tabSize":8,"topBannersInfo":{"overridingGlobalFundingFile":false,"globalPreferredFundingPath":null,"showInvalidCitationWarning":false,"citationHelpUrl":"https://docs.github.com/github/creating-cloning-and-archiving-repositories/creating-a-repository-on-github/about-citation-files","actionsOnboardingTip":null},"truncated":false,"viewable":true,"workflowRedirectUrl":null,"symbols":{"timed_out":false,"not_analyzed":false,"symbols":[{"name":"Attribution Reporting API with Aggregatable Reports","kind":"section_1","ident_start":2,"ident_end":53,"extent_start":0,"extent_end":37644,"fully_qualified_name":"Attribution 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0 0 3Z"></path></svg></button></div></div></div></div><div></div></div><div class="Box-sc-g0xbh4-0 hGyMdv"><section aria-labelledby="file-name-id-wide file-name-id-mobile" class="Box-sc-g0xbh4-0 fGqKFv"><div class="Box-sc-g0xbh4-0 eoaCFS js-snippet-clipboard-copy-unpositioned" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Attribution Reporting API with Aggregatable Reports</h1><a id="user-content-attribution-reporting-api-with-aggregatable-reports" class="anchor" aria-label="Permalink: Attribution Reporting API with Aggregatable Reports" href="#attribution-reporting-api-with-aggregatable-reports"><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"><strong>Table of Contents</strong></p> <ul dir="auto"> <li><a href="#authors">Authors</a></li> <li><a href="#introduction">Introduction</a></li> <li><a href="#goals">Goals</a></li> <li><a href="#api-changes">API changes</a> <ul dir="auto"> <li><a href="#attribution-source-registration">Attribution source registration</a></li> <li><a href="#attribution-trigger-registration">Attribution trigger registration</a></li> <li><a href="#aggregatable-reports">Aggregatable reports</a> <ul dir="auto"> <li><a href="#encrypted-payload">Encrypted payload</a></li> </ul> </li> <li><a href="#optional-transitional-debugging-reports">Optional: transitional debugging reports</a> <ul dir="auto"> <li><a href="#attribution-success-debugging-reports">Attribution-success debugging reports</a></li> <li><a href="#verbose-debugging-reports">Verbose debugging reports</a></li> </ul> </li> <li><a href="#contribution-bounding-and-budgeting">Contribution bounding and budgeting</a></li> <li><a href="#storage-limits">Storage limits</a></li> <li><a href="#hide-the-true-number-of-attribution-reports">Hide the true number of attribution reports</a></li> <li><a href="#optional-reduce-report-delay-with-trigger-context-id">Optional: reduce report delay with trigger context ID</a></li> <li><a href="#optional-flexible-contribution-filtering-with-filtering-ids">Optional: flexible contribution filtering with filtering IDs</a></li> <li><a href="#optional-named-budgets">Optional: named budgets</a></li> </ul> </li> <li><a href="#data-processing-through-a-secure-aggregation-service">Data processing through a Secure Aggregation Service</a></li> <li><a href="#privacy-considerations">Privacy considerations</a> <ul dir="auto"> <li><a href="#differential-privacy">Differential Privacy</a></li> </ul> </li> <li><a href="#ideas-for-future-iteration">Ideas for future iteration</a> <ul dir="auto"> <li><a href="#worklet-based-aggregation-key-generation">Worklet-based aggregation key generation</a></li> <li><a href="#custom-attribution-models">Custom attribution models</a></li> <li><a href="#more-advanced-contribution-bounding">More advanced contribution bounding</a></li> <li><a href="#choosing-among-aggregation-services">Choosing among aggregation services</a></li> </ul> </li> <li><a href="#considered-alternatives">Considered alternatives</a> <ul dir="auto"> <li><a href="#count-vs-value-histograms">“Count” vs. “value” histograms</a></li> <li><a href="#binary-report-format">Binary report format</a></li> </ul> </li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Authors</h2><a id="user-content-authors" class="anchor" aria-label="Permalink: Authors" href="#authors"><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="mailto:csharrison@chromium.org">csharrison@chromium.org</a></li> <li><a href="mailto:johnidel@chromium.org">johnidel@chromium.org</a></li> <li><a href="mailto:marianar@google.com">marianar@google.com</a></li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Introduction</h2><a id="user-content-introduction" class="anchor" aria-label="Permalink: Introduction" href="#introduction"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This document proposes extensions to our existing <a href="https://github.com/WICG/attribution-reporting-api">Attribution Reporting API</a> that reports event-level data. The intention is to provide a mechanism for rich metadata to be reported in aggregate, to better support use-cases such as campaign-level performance reporting or conversion values.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Goals</h2><a id="user-content-goals" class="anchor" aria-label="Permalink: Goals" href="#goals"><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">Aggregatable attribution reports should support legitimate measurement use cases not already supported by the event-level reports. These include:</p> <ul dir="auto"> <li>Higher fidelity measurement of attribution-trigger (conversion-side) data, which is very limited in event-level attribution reports, including the ability to sum <em>values</em> rather than just counts</li> <li>A system which enables the most robust privacy protections</li> <li>Ability to receive aggregatable reports alongside event-level reports</li> <li>Ability to receive data at a faster rate than with event-level reports</li> <li>Greater flexibility to trade off attribution-trigger (conversion-side) data, reporting rate and accuracy.</li> </ul> <p dir="auto">Note: fraud detection (enabling the filtration of reports you are not expecting) is a goal but it is left out of scope for this document for now.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">API changes</h2><a id="user-content-api-changes" class="anchor" aria-label="Permalink: API changes" href="#api-changes"><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 client API for creating contributions to an aggregate report uses the same API base as for event level reports with a few extensions. In the following example an ad-tech will use the API to collect:</p> <ul dir="auto"> <li>Aggregate conversion counts at a per-campaign level</li> <li>Aggregate purchase values at a per geo level</li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Attribution source registration</h3><a id="user-content-attribution-source-registration" class="anchor" aria-label="Permalink: Attribution source registration" href="#attribution-source-registration"><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">Registering sources eligible for aggregate reporting entails adding a new <code>aggregation_keys</code> dictionary field to the JSON dictionary of the <a href="https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#registering-attribution-sources"><code>Attribution-Reporting-Register-Source</code> header</a>:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ ... // existing fields, such as `source_event_id` and `destination` "aggregation_keys": { // Generates a "0x159" key piece (low order bits of the key) for the key named // "campaignCounts". "campaignCounts": "0x159", // User saw ad from campaign 345 (out of 511) // Generates a "0x5" key piece (low order bits of the key) for the key named "geoValue". "geoValue": "0x5" // Source-side geo region = 5 (US), out of a possible ~100 regions }, "aggregatable_report_window": "86400" }"><pre><span class="pl-kos">{</span> ... <span class="pl-c">// existing fields, such as `source_event_id` and `destination`</span> <span class="pl-s">"aggregation_keys"</span>: <span class="pl-kos">{</span> <span class="pl-c">// Generates a "0x159" key piece (low order bits of the key) for the key named</span> <span class="pl-c">// "campaignCounts".</span> <span class="pl-s">"campaignCounts"</span>: <span class="pl-s">"0x159"</span><span class="pl-kos">,</span> <span class="pl-c">// User saw ad from campaign 345 (out of 511)</span> <span class="pl-c">// Generates a "0x5" key piece (low order bits of the key) for the key named "geoValue".</span> <span class="pl-s">"geoValue"</span>: <span class="pl-s">"0x5"</span> <span class="pl-c">// Source-side geo region = 5 (US), out of a possible ~100 regions</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-s">"aggregatable_report_window"</span>: <span class="pl-s">"86400"</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">This defines a dictionary of named aggregation keys, each with a piece of the aggregation key defined as a hex-string. The final histogram bucket key will be fully defined at trigger time using a combination (binary OR) of this piece and trigger-side pieces.</p> <p dir="auto">Final keys will be restricted to a maximum of 128 bits. This means that hex strings in the JSON must be limited to at most 32 digits.</p> <p dir="auto">There is also a new optional field, <code>aggregatable_report_window</code>, which is the duration in seconds after source registration during which aggregatable reports may be created for this source.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Attribution trigger registration</h3><a id="user-content-attribution-trigger-registration" class="anchor" aria-label="Permalink: Attribution trigger registration" href="#attribution-trigger-registration"><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">Trigger registration will also add two new fields to the JSON dictionary of the <a href="https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#triggering-attribution"><code>Attribution-Reporting-Register-Trigger</code> header</a>:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ ... // existing fields, such as `event_trigger_data` "aggregatable_trigger_data": [ // Each dict independently adds pieces to multiple source keys. { // Conversion type purchase = 2 at a 9 bit offset, i.e. 2 << 9. // A 9 bit offset is needed because there are 511 possible campaigns, which // will take up 9 bits in the resulting key. "key_piece": "0x400", // Apply this key piece to: "source_keys": ["campaignCounts"] }, { // Purchase category shirts = 21 at a 7 bit offset, i.e. 21 << 7. // A 7 bit offset is needed because there are ~100 regions for the geo key, // which will take up 7 bits of space in the resulting key. "key_piece": "0xA80", // Apply this key piece to: "source_keys": ["geoValue", "nonMatchingKeyIdsIgnored"] } ], "aggregatable_values": { // Each source event can contribute a maximum of L1 = 2^16 to the aggregate // histogram. In this example, use this whole budget on a single trigger, // evenly allocating this "budget" across two measurements. Note that this // will require rescaling when post-processing aggregates! // 1 count = L1 / 2 = 2^15 "campaignCounts": 32768, // Purchase was for $52. The site's max value is $1024. // $1 = (L1 / 2) / 1024. // $52 = 52 * (L1 / 2) / 1024 = 1664 "geoValue": 1664 } }"><pre><span class="pl-kos">{</span> ... <span class="pl-c">// existing fields, such as `event_trigger_data`</span> <span class="pl-s">"aggregatable_trigger_data"</span>: <span class="pl-kos">[</span> <span class="pl-c">// Each dict independently adds pieces to multiple source keys.</span> <span class="pl-kos">{</span> <span class="pl-c">// Conversion type purchase = 2 at a 9 bit offset, i.e. 2 << 9.</span> <span class="pl-c">// A 9 bit offset is needed because there are 511 possible campaigns, which</span> <span class="pl-c">// will take up 9 bits in the resulting key.</span> <span class="pl-s">"key_piece"</span>: <span class="pl-s">"0x400"</span><span class="pl-kos">,</span> <span class="pl-c">// Apply this key piece to:</span> <span class="pl-s">"source_keys"</span>: <span class="pl-kos">[</span><span class="pl-s">"campaignCounts"</span><span class="pl-kos">]</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c">// Purchase category shirts = 21 at a 7 bit offset, i.e. 21 << 7.</span> <span class="pl-c">// A 7 bit offset is needed because there are ~100 regions for the geo key,</span> <span class="pl-c">// which will take up 7 bits of space in the resulting key.</span> <span class="pl-s">"key_piece"</span>: <span class="pl-s">"0xA80"</span><span class="pl-kos">,</span> <span class="pl-c">// Apply this key piece to:</span> <span class="pl-s">"source_keys"</span>: <span class="pl-kos">[</span><span class="pl-s">"geoValue"</span><span class="pl-kos">,</span> <span class="pl-s">"nonMatchingKeyIdsIgnored"</span><span class="pl-kos">]</span> <span class="pl-kos">}</span> <span class="pl-kos">]</span><span class="pl-kos">,</span> <span class="pl-s">"aggregatable_values"</span>: <span class="pl-kos">{</span> <span class="pl-c">// Each source event can contribute a maximum of L1 = 2^16 to the aggregate</span> <span class="pl-c">// histogram. In this example, use this whole budget on a single trigger,</span> <span class="pl-c">// evenly allocating this "budget" across two measurements. Note that this</span> <span class="pl-c">// will require rescaling when post-processing aggregates!</span> <span class="pl-c">// 1 count = L1 / 2 = 2^15</span> <span class="pl-s">"campaignCounts"</span>: <span class="pl-c1">32768</span><span class="pl-kos">,</span> <span class="pl-c">// Purchase was for $52. The site's max value is $1024.</span> <span class="pl-c">// $1 = (L1 / 2) / 1024.</span> <span class="pl-c">// $52 = 52 * (L1 / 2) / 1024 = 1664</span> <span class="pl-s">"geoValue"</span>: <span class="pl-c1">1664</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">The <code>aggregatable_trigger_data</code> field is a list of dict which generates aggregation keys.</p> <p dir="auto">The <code>aggregatable_values</code> field lists an amount of an abstract "value" to contribute to each key, which can be integers in [1, 2<sup>16</sup>]. These are attached to aggregation keys in the order they are generated. See the <a href="#contribution-bounding-and-budgeting">contribution budgeting</a> section for more details on how to allocate these contribution values.</p> <p dir="auto">The scheme above will generate the following abstract histogram contributions:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="[ // campaignCounts { key: 0x559, // = 0x159 | 0x400 value: 32768 }, // geoValue: { key: 0xA85, // = 0x5 | 0xA80 value: 1664 }]"><pre><span class="pl-kos">[</span> <span class="pl-c">// campaignCounts</span> <span class="pl-kos">{</span> <span class="pl-c1">key</span>: <span class="pl-c1">0x559</span><span class="pl-kos">,</span> <span class="pl-c">// = 0x159 | 0x400</span> <span class="pl-c1">value</span>: <span class="pl-c1">32768</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-c">// geoValue:</span> <span class="pl-kos">{</span> <span class="pl-c1">key</span>: <span class="pl-c1">0xA85</span><span class="pl-kos">,</span> <span class="pl-c">// = 0x5 | 0xA80</span> <span class="pl-c1">value</span>: <span class="pl-c1">1664</span> <span class="pl-kos">}</span><span class="pl-kos">]</span></pre></div> <p dir="auto">Note: the above scheme was used to maximize the <a href="#contribution-bounding-and-budgeting">contribution budget</a> and optimize utility in the face of constant noise. To rescale, simply inverse the scaling factors used above:</p> <div class="highlight highlight-source-python notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="L1 = 1 << 16 true_agg_campaign_counts = raw_agg_campaign_counts / (L1 / 2) true_agg_geo_value = 1024 * raw_agg_geo_value / (L1 / 2)"><pre><span class="pl-v">L1</span> <span class="pl-c1">=</span> <span class="pl-c1">1</span> <span class="pl-c1"><<</span> <span class="pl-c1">16</span> <span class="pl-s1">true_agg_campaign_counts</span> <span class="pl-c1">=</span> <span class="pl-s1">raw_agg_campaign_counts</span> <span class="pl-c1">/</span> (<span class="pl-v">L1</span> <span class="pl-c1">/</span> <span class="pl-c1">2</span>) <span class="pl-s1">true_agg_geo_value</span> <span class="pl-c1">=</span> <span class="pl-c1">1024</span> <span class="pl-c1">*</span> <span class="pl-s1">raw_agg_geo_value</span> <span class="pl-c1">/</span> (<span class="pl-v">L1</span> <span class="pl-c1">/</span> <span class="pl-c1">2</span>)</pre></div> <p dir="auto">Note: The <code>filters</code> field will still apply to aggregatable reports, and each dict in <code>aggregatable_trigger_data</code> can still optionally have filters applied to it just like for event-level reports.</p> <p dir="auto">Note: The <code>aggregatable_values</code> field may also be specified as a list of dictionaries, where each dictionary contains a dictionary <code>values</code> of key-value pairs as outlined above as well as optional <code>filters</code> and <code>not_filters</code> fields, allowing trigger registrations to customize how values are contributed to keys depending on source filter data. If multiple list entries have filters that match the source's filters, only the first entry and its corresponding values will be used.</p> <p dir="auto">For example:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ ..., "aggregatable_values": [ { "values": { "campaignCounts": 32768, "geoValue": 1664 }, "filters": {"source_type": ["navigation"]} } ] }"><pre><span class="pl-kos">{</span> ...<span class="pl-kos">,</span> <span class="pl-s">"aggregatable_values"</span>: <span class="pl-kos">[</span> <span class="pl-kos">{</span> <span class="pl-s">"values"</span>: <span class="pl-kos">{</span> <span class="pl-s">"campaignCounts"</span>: <span class="pl-c1">32768</span><span class="pl-kos">,</span> <span class="pl-s">"geoValue"</span>: <span class="pl-c1">1664</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-s">"filters"</span>: <span class="pl-kos">{</span><span class="pl-s">"source_type"</span>: <span class="pl-kos">[</span><span class="pl-s">"navigation"</span><span class="pl-kos">]</span><span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-kos">]</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">Trigger registration will accept an optional field <code>aggregatable_deduplication_keys</code> which will be used to deduplicate multiple triggers containing the same <code>deduplication_key</code> for a single source with selective filtering.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ ... "aggregatable_deduplication_keys": [ { "deduplication_key": "[unsigned 64-bit integer]", "filters": {"source_type": ["navigation"]} } ] }"><pre><span class="pl-kos">{</span> ... <span class="pl-s">"aggregatable_deduplication_keys"</span>: <span class="pl-kos">[</span> <span class="pl-kos">{</span> <span class="pl-s">"deduplication_key"</span>: <span class="pl-s">"[unsigned 64-bit integer]"</span><span class="pl-kos">,</span> <span class="pl-s">"filters"</span>: <span class="pl-kos">{</span><span class="pl-s">"source_type"</span>: <span class="pl-kos">[</span><span class="pl-s">"navigation"</span><span class="pl-kos">]</span><span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-kos">]</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">The browser will create aggregatable reports for a source only if the trigger's <code>aggregatable_deduplication_key</code> has not already been associated with an aggregatable report for that source.</p> <p dir="auto">Note that aggregatable trigger registration is independent of event-level trigger registration.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Aggregatable reports</h3><a id="user-content-aggregatable-reports" class="anchor" aria-label="Permalink: Aggregatable reports" href="#aggregatable-reports"><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">Aggregatable reports will look very similar to event-level reports. They will be reported via HTTP POST to the reporting origin at the path <code>.well-known/attribution-reporting/report-aggregate-attribution</code>.</p> <p dir="auto">The report itself does not contain histogram contributions in the clear. Rather, the report embeds them in an <em>encrypted payload</em> that can only be read by a trusted aggregation service known by the browser.</p> <p dir="auto">The report will be JSON encoded with the following scheme:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ // Info that the aggregation services also need encoded in JSON // for use with AEAD. "shared_info": "{\"api\":\"attribution-reporting\",\"attribution_destination\":\"https://advertiser.example\",\"report_id\":\"[UUID]\",\"reporting_origin\":\"https://reporter.example\",\"scheduled_report_time\":\"[timestamp in seconds]\",\"source_registration_time\":\"[timestamp in seconds]\",\"version\":\"[api version]\"}", // Support a list of payloads for future extensibility if multiple helpers // are necessary. Currently only supports a single helper configured // by the browser. "aggregation_service_payloads": [ { "payload": "[base64-encoded HPKE encrypted data readable only by the aggregation service]", "key_id": "[string identifying public key used to encrypt payload]", // Optional debugging information, if cookie-based debugging is allowed. "debug_cleartext_payload": "[base64-encoded unencrypted payload]", }, ], // The deployment option for the aggregation service. "aggregation_coordinator_origin": "https://publickeyservice.msmt.aws.privacysandboxservices.com", // Optional debugging information (also present in event-level reports), // if cookie-based debugging is allowed. "source_debug_key": "[64 bit unsigned integer]", "trigger_debug_key": "[64 bit unsigned integer]", // Optional trigger context ID. "trigger_context_id": "example string" }"><pre><span class="pl-kos">{</span> <span class="pl-c">// Info that the aggregation services also need encoded in JSON</span> <span class="pl-c">// for use with AEAD.</span> <span class="pl-s">"shared_info"</span>: <span class="pl-s">"{\"api\":\"attribution-reporting\",\"attribution_destination\":\"https://advertiser.example\",\"report_id\":\"[UUID]\",\"reporting_origin\":\"https://reporter.example\",\"scheduled_report_time\":\"[timestamp in seconds]\",\"source_registration_time\":\"[timestamp in seconds]\",\"version\":\"[api version]\"}"</span><span class="pl-kos">,</span> <span class="pl-c">// Support a list of payloads for future extensibility if multiple helpers</span> <span class="pl-c">// are necessary. Currently only supports a single helper configured</span> <span class="pl-c">// by the browser.</span> <span class="pl-s">"aggregation_service_payloads"</span>: <span class="pl-kos">[</span> <span class="pl-kos">{</span> <span class="pl-s">"payload"</span>: <span class="pl-s">"[base64-encoded HPKE encrypted data readable only by the aggregation service]"</span><span class="pl-kos">,</span> <span class="pl-s">"key_id"</span>: <span class="pl-s">"[string identifying public key used to encrypt payload]"</span><span class="pl-kos">,</span> <span class="pl-c">// Optional debugging information, if cookie-based debugging is allowed.</span> <span class="pl-s">"debug_cleartext_payload"</span>: <span class="pl-s">"[base64-encoded unencrypted payload]"</span><span class="pl-kos">,</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-kos">]</span><span class="pl-kos">,</span> <span class="pl-c">// The deployment option for the aggregation service.</span> <span class="pl-s">"aggregation_coordinator_origin"</span>: <span class="pl-s">"https://publickeyservice.msmt.aws.privacysandboxservices.com"</span><span class="pl-kos">,</span> <span class="pl-c">// Optional debugging information (also present in event-level reports),</span> <span class="pl-c">// if cookie-based debugging is allowed.</span> <span class="pl-s">"source_debug_key"</span>: <span class="pl-s">"[64 bit unsigned integer]"</span><span class="pl-kos">,</span> <span class="pl-s">"trigger_debug_key"</span>: <span class="pl-s">"[64 bit unsigned integer]"</span><span class="pl-kos">,</span> <span class="pl-c">// Optional trigger context ID.</span> <span class="pl-s">"trigger_context_id"</span>: <span class="pl-s">"example string"</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">Reports will not be delayed to the same extent as they are for event level reports. The browser will delay them with a random delay between 0 to 10 minutes, or with a small delay after the browser next starts up. The browser is free to utilize techniques like retries to minimize data loss.</p> <ul dir="auto"> <li> <p dir="auto">The <code>shared_info</code> will be a serialized JSON object. This exact string is used as authenticated data for decryption, see <a href="#encrypted-payload">below</a>. The string therefore must be forwarded to the aggregation service unmodified. The reporting origin can parse the string to access the encoded fields.</p> </li> <li> <p dir="auto">The <code>api</code> field is a string enum identifying the API that triggered the report. This allows the aggregation service to extend support to other APIs in the future.</p> </li> <li> <p dir="auto">The <code>scheduled_report_time</code> will be the number of seconds since the Unix Epoch (1970-01-01T00:00:00Z, ignoring leap seconds) to align with <a href="https://heycam.github.io/webidl/#DOMTimeStamp" rel="nofollow">DOMTimestamp</a> until the browser initially scheduled the report to be sent (to avoid noise around offline devices reporting late).</p> </li> <li> <p dir="auto">The <code>source_registration_time</code> will represent (in seconds since the Unix Epoch) the time the source event was registered, rounded down to a whole day.</p> </li> <li> <p dir="auto">The <code>payload</code> will contain the actual histogram contributions. It should be be encrypted and then base64 encoded, see <a href="#encrypted-payload">below</a>.</p> </li> </ul> <p dir="auto">Optional debugging fields are discussed <a href="#attribution-success-debugging-reports">below</a>.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Encrypted payload</h4><a id="user-content-encrypted-payload" class="anchor" aria-label="Permalink: Encrypted payload" href="#encrypted-payload"><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 <code>payload</code> should be a <a href="https://cbor.io" rel="nofollow">CBOR</a> map encrypted via <a href="https://datatracker.ietf.org/doc/draft-irtf-cfrg-hpke/" rel="nofollow">HPKE</a> and then base64 encoded. The map will have the following structure:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// CBOR { "operation": "histogram", // Allows for the service to support other operations in the future "data": [{ "bucket": <bucket, encoded as a 16-byte (i.e. 128-bit) big-endian bytestring>, "value": <value, encoded as a 4-byte (i.e. 32-bit) big-endian bytestring>, // k is equal to the value `aggregatable_filtering_id_max_bytes`, defaults to 1 (i.e. 8-bit). "id": <filtering ID, encoded as a k-byte big-endian bytestring, defaults to 0> }, ...] }"><pre><span class="pl-c">// CBOR</span> <span class="pl-kos">{</span> <span class="pl-s">"operation"</span>: <span class="pl-s">"histogram"</span><span class="pl-kos">,</span> <span class="pl-c">// Allows for the service to support other operations in the future</span> <span class="pl-s">"data"</span>: <span class="pl-kos">[</span><span class="pl-kos">{</span> <span class="pl-s">"bucket"</span>: <span class="pl-c1"><</span><span class="pl-s1">bucket</span><span class="pl-kos">,</span> <span class="pl-c1">encoded</span> <span class="pl-c1">as</span> <span class="pl-c1">a</span> <span class="pl-c1">16</span><span class="pl-c1">-</span><span class="pl-c1">byte</span> <span class="pl-kos">(</span><span class="pl-c1">i</span><span class="pl-kos">.</span><span class="pl-s1">e</span><span class="pl-kos">.</span> <span class="pl-c1">128</span><span class="pl-c1">-</span><span class="pl-s1">bit</span><span class="pl-kos">)</span> <span class="pl-c1">big-endian</span> <span class="pl-c1">bytestring</span><span class="pl-c1">></span>, "value": <span class="pl-c1"><</span><span class="pl-s1">value</span><span class="pl-kos">,</span> <span class="pl-c1">encoded</span> <span class="pl-c1">as</span> <span class="pl-c1">a</span> <span class="pl-c1">4</span><span class="pl-c1">-</span><span class="pl-c1">byte</span> <span class="pl-kos">(</span><span class="pl-c1">i</span><span class="pl-kos">.</span><span class="pl-s1">e</span><span class="pl-kos">.</span> <span class="pl-c1">32</span><span class="pl-c1">-</span><span class="pl-s1">bit</span><span class="pl-kos">)</span> <span class="pl-c1">big-endian</span> <span class="pl-c1">bytestring</span><span class="pl-c1">></span>, // k is equal to the value `aggregatable_filtering_id_max_bytes`, defaults to 1 (i.e. 8-bit). "id": <span class="pl-c1"><</span><span class="pl-ent">filtering</span> <span class="pl-c1">ID</span><span class="pl-kos">,</span> <span class="pl-c1">encoded</span> <span class="pl-c1">as</span> <span class="pl-c1">a</span> <span class="pl-c1">k-byte</span> <span class="pl-c1">big-endian</span> <span class="pl-c1">bytestring</span><span class="pl-kos">,</span> <span class="pl-c1">defaults</span> <span class="pl-c1">to</span> <span class="pl-c1">0</span><span class="pl-c1">></span> <span class="pl-kos">}</span><span class="pl-kos">,</span> ...<span class="pl-kos">]</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">The browser may encode multiple contributions in the same payload; this is only possible if all other fields in the report/payload are identical for the contributions. To avoid revealing the number of contributions in the payload through its encrypted size, the browser should pad the list of payloads with 'null' (zero value) contributions up to the maximum. In the future, a more direct padding scheme could be considered.</p> <p dir="auto">This encryption should use <a href="https://en.wikipedia.org/wiki/Authenticated_encryption" rel="nofollow">AEAD</a> to ensure that the information in <code>shared_info</code> is not tampered with, since the aggregation service will need that information to do proper replay protection. The authenticated data will consist of the <code>shared_info</code> string (encoded as UTF-8) with a constant prefix added for domain separation, i.e. to avoid ciphertexts being reused for different protocols, even if public keys are shared.</p> <p dir="auto">The encryption will use public keys specified by the aggregation service. The browser will encrypt payloads just before the report is sent by fetching the public key endpoint (the aggregation service coordinator origin at the path <code>/.well-known/aggregation-service/v1/public-keys</code>) with an un-credentialed request. The processing origin will respond with a set of keys which will be stored according to standard HTTP caching rules, i.e. using Cache-Control headers to dictate how long to store the keys for (e.g. following the <a href="https://datatracker.ietf.org/doc/html/rfc7234#section-4.2" rel="nofollow">freshness lifetime</a>). The browser could enforce maximum/minimum lifetimes of stored keys to encourage faster key rotation and/or mitigate bandwidth usage. The scheme of the JSON encoded public keys is as follows:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ "keys": [ { "id": "[arbitrary string identifying the key (up to 128 characters)]", "key": "[base64 encoded public key]" }, // Optionally, more keys. ] }"><pre><span class="pl-kos">{</span> <span class="pl-s">"keys"</span>: <span class="pl-kos">[</span> <span class="pl-kos">{</span> <span class="pl-s">"id"</span>: <span class="pl-s">"[arbitrary string identifying the key (up to 128 characters)]"</span><span class="pl-kos">,</span> <span class="pl-s">"key"</span>: <span class="pl-s">"[base64 encoded public key]"</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-c">// Optionally, more keys.</span> <span class="pl-kos">]</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">Note: The version in the <code>.well-known</code> path may be updated in the future versions of the spec if the public key serving details change, especially in a backwards incompatible way.</p> <p dir="auto">To limit the impact of a single compromised key, multiple keys (up to a small limit) can be provided. The browser should independently pick a key uniformly at random for each payload it encrypts to avoid associating different reports. Additionally, a public key endpoint should not reuse an ID string for a different key. In particular, IDs must be unique within a single response to be valid. In the case of backwards incompatible changes to this scheme (e.g. in future versions of the API), the endpoint URL should also change.</p> <p dir="auto"><strong>Note:</strong> The browser may need some mechanism to ensure that the same set of keys are delivered to different users.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Optional: transitional debugging reports</h3><a id="user-content-optional-transitional-debugging-reports" class="anchor" aria-label="Permalink: Optional: transitional debugging reports" href="#optional-transitional-debugging-reports"><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"><h4 tabindex="-1" class="heading-element" dir="auto">Attribution-success debugging reports</h4><a id="user-content-attribution-success-debugging-reports" class="anchor" aria-label="Permalink: Attribution-success debugging reports" href="#attribution-success-debugging-reports"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If <a href="https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#attribution-success-debugging-reports">debugging</a> is enabled, additional debug fields will be present in aggregatable reports. The <code>source_debug_key</code> and <code>trigger_debug_key</code> fields match those in the event-level reports. If both the source and trigger debug keys are set, there will be a <code>debug_cleartext_payload</code> field included in the report. It will contain the base64-encoded cleartext of the encrypted payload to allow downstream systems to verify that reports are constructed correctly. If both debug keys are set, the <code>shared_info</code> will also include the flag <code>"debug_mode": "enabled"</code> to allow the aggregation service to support debugging functionality on these reports.</p> <p dir="auto">Additionally, a duplicate debug report will be sent immediately (i.e. without the random delay) to a <code>.well-known/attribution-reporting/debug/report-aggregate-attribution</code> endpoint. The debug reports should be almost identical to the normal reports, including the additional debug fields. However, the <code>payload</code> ciphertext will differ due to repeating the encryption operation and the <code>key_id</code> may differ if the previous key had since expired or the browser randomly chose a different valid public key.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Verbose debugging reports</h4><a id="user-content-verbose-debugging-reports" class="anchor" aria-label="Permalink: Verbose debugging reports" href="#verbose-debugging-reports"><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">As outlined in the <a href="https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#verbose-debugging-reports">event-level explainer</a>, certain aggregate attribution failures can be monitored as well.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Contribution bounding and budgeting</h3><a id="user-content-contribution-bounding-and-budgeting" class="anchor" aria-label="Permalink: Contribution bounding and budgeting" href="#contribution-bounding-and-budgeting"><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">Each attribution can make multiple contributions to an underlying aggregate histogram, and a given user can trigger multiple attributions for a particular source / trigger site pair. Our goal in this section is to <em>bound</em> the contributions any source event can make to a histogram.</p> <p dir="auto">This bound is characterized by a single parameters: <code>L1</code>, the maximum sum of the contributions (values) across all buckets for a given source event. L1 refers to the L1 sensitivity / norm of the histogram contributions per source event.</p> <p dir="auto">Exceeding these limits will cause future contributions to silently drop.<br> While exposing failure in any kind of error interface can be used to leak sensitive information, we might be able to reveal aggregate failure results via some other monitoring side channel in the future.</p> <p dir="auto">For the initial proposal, set <code>L1 = 65536</code>. Note that for privacy, this parameter can be arbitrary, as noise in the aggregation service will be scaled in proportion to this parameter. In the example above, the budget is split equally between two keys, one for the number of conversions per campaign and the other representing the conversion dollar value per geography. This budgeting mechanism is highly flexible and can support many different aggregation strategies as long as the appropriate scaling is performed on the outputs.</p> <p dir="auto">The browser also applies a limit on the number of contributions within a single report.</p> <p dir="auto">Strawman: There should be a limit of 20 contributions per aggregatable report.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Storage limits</h3><a id="user-content-storage-limits" class="anchor" aria-label="Permalink: Storage limits" href="#storage-limits"><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 browser may apply storage limits in order to prevent excessive resource usage.</p> <p dir="auto">Strawman: There should be a limit of 1024 pending aggregatable reports per destination site.</p> <p dir="auto">Note: The storage limits for event-level and aggregatable reports are enforced independently of each other.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Hide the true number of attribution reports</h3><a id="user-content-hide-the-true-number-of-attribution-reports" class="anchor" aria-label="Permalink: Hide the true number of attribution reports" href="#hide-the-true-number-of-attribution-reports"><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 presence or absence of an attribution report leaks some potentially sensitive cross-site data in the current design. Therefore, revealing the total count of reports to the reporting origin could leak something sensitive as well (imagine if the reporting origin only ever registered a conversion or impression for a single user).</p> <p dir="auto">To hide the true number of reports, the browser will add noise to the number of reports by randomly sending noisy null reports for some fraction of trigger registrations. Null reports will not check or affect rate limits.</p> <p dir="auto">As a lot of the cross site information is embedded in the source registration time, trigger registration will accept an optional field <code>aggregatable_source_registration_time</code> to allow developers to specify whether to exclude or include <code>source_registration_time</code> field within <code>shared_info</code> in the aggregatable report. The null report rate will need to be higher if <code>source_registration_time</code> is present in the aggregatable report.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ ..., "aggregatable_trigger_data": ..., "aggregatable_values": ..., "aggregatable_source_registration_time": "exclude" // or "include", defaults to "exclude" if not present }"><pre><span class="pl-kos">{</span> ...<span class="pl-kos">,</span> <span class="pl-s">"aggregatable_trigger_data"</span>: ...<span class="pl-s1"></span><span class="pl-kos">,</span> <span class="pl-s">"aggregatable_values"</span>: ...<span class="pl-s1"></span><span class="pl-kos">,</span> <span class="pl-s">"aggregatable_source_registration_time"</span>: <span class="pl-s">"exclude"</span> <span class="pl-c">// or "include", defaults to "exclude" if not present</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">Strawman: There should be ~0.05 reports (in expectation) sent for trigger registrations that exclude the <code>source_registration_time</code> field, and ~0.25 reports for those that include this field.</p> <p dir="auto">In order to limit abuse of the protections above, there will be a maximum limit of 20 aggregatable reports per source.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Optional: reduce report delay with trigger context ID</h3><a id="user-content-optional-reduce-report-delay-with-trigger-context-id" class="anchor" aria-label="Permalink: Optional: reduce report delay with trigger context ID" href="#optional-reduce-report-delay-with-trigger-context-id"><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">Trigger registration will accept an optional string field <code>trigger_context_id</code>, a high-entropy ID that represents the data associated with the trigger.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ ..., // existing fields "trigger_context_id": "example string" // max length 64 }"><pre><span class="pl-kos">{</span> ...<span class="pl-kos">,</span> <span class="pl-c">// existing fields</span> <span class="pl-s">"trigger_context_id"</span>: <span class="pl-s">"example string"</span> <span class="pl-c">// max length 64</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">This ID will be embedded unencrypted in the aggregatable report.</p> <p dir="auto">To avoid leaking cross-site information through the count of reports with the given ID, the browser will unconditionally send an aggregatable report on every trigger registration with a trigger context ID. A null report will be sent in the case that the trigger registration did not generate an attribution report. The source registration time will always be excluded from the aggregatable report with a trigger context ID.</p> <p dir="auto">As the trigger context ID in the aggregatable report explicitly reveals the association between the report and the trigger, these reports can be sent immediately without delay.</p> <p dir="auto">Note: This is an <a href="https://github.com/WICG/attribution-reporting-api/blob/main/report_verification.md#could-we-just-tag-reports-with-a-trigger_id-instead-of-using-anonymous-tokens">alternative</a> considered for <a href="https://github.com/WICG/attribution-reporting-api/blob/main/report_verification.md">report verification</a>, and achieves all of the higher priority <a href="https://github.com/WICG/attribution-reporting-api/blob/main/report_verification.md#security-goals">security goals</a>. A similar design was proposed for the <a href="https://github.com/patcg-individual-drafts/private-aggregation-api/blob/main/report_verification.md#shared-storage">Private Aggregation API</a> for the purpose of report verification.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Optional: flexible contribution filtering with filtering IDs</h3><a id="user-content-optional-flexible-contribution-filtering-with-filtering-ids" class="anchor" aria-label="Permalink: Optional: flexible contribution filtering with filtering IDs" href="#optional-flexible-contribution-filtering-with-filtering-ids"><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">Trigger registration's <code>aggregatable_values</code>'s values can be integers or dictionaries with an optional <code>filtering_id</code> field.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ ..., // existing fields "aggregatable_filtering_id_max_bytes": 2, // defaults to 1 "aggregatable_values": { "campaignCounts": 32768, "geoValue": { "value": 1664, "filtering_id": "23" // must fit within <aggregatable_filtering_id_max_bytes> bytes } } }"><pre><span class="pl-kos">{</span> ...<span class="pl-kos">,</span> <span class="pl-c">// existing fields</span> <span class="pl-s">"aggregatable_filtering_id_max_bytes"</span>: <span class="pl-c1">2</span><span class="pl-kos">,</span> <span class="pl-c">// defaults to 1</span> <span class="pl-s">"aggregatable_values"</span>: <span class="pl-kos">{</span> <span class="pl-s">"campaignCounts"</span>: <span class="pl-c1">32768</span><span class="pl-kos">,</span> <span class="pl-s">"geoValue"</span>: <span class="pl-kos">{</span> <span class="pl-s">"value"</span>: <span class="pl-c1">1664</span><span class="pl-kos">,</span> <span class="pl-s">"filtering_id"</span>: <span class="pl-s">"23"</span> <span class="pl-c">// must fit within <aggregatable_filtering_id_max_bytes> bytes</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">These IDs will be included in the encrypted aggregatable report payload contributions.</p> <p dir="auto">Queries to the aggregation service can provide a list of allowed filtering IDs and all contributions with non-allowed IDs will be filtered out.</p> <p dir="auto">The filtering IDs need to be unsigned integers limited to a small number of bytes, (1 byte = 8 bits) by default. We limit the size of the ID space to prevent unnecessarily increasing the payload size and thus storage and processing costs.</p> <p dir="auto">This size can be increased via the <code>aggregatable_filtering_id_max_bytes</code> field. To avoid amplifying a counting attack due to the resulting different payload size, the browser will unconditionally send an aggregatable report on every trigger registration with a non-default (greater than 1) max bytes. A null report will be sent in the case that the trigger registration did not generate an attribution report. The source registration time will always be excluded from the aggregatable report with a non-default max bytes. This behavior is the same as when a trigger context ID is set.</p> <p dir="auto">See <a href="https://github.com/patcg-individual-drafts/private-aggregation-api/blob/main/flexible_filtering.md">flexible_filtering.md</a> for more details.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Optional: named budgets</h3><a id="user-content-optional-named-budgets" class="anchor" aria-label="Permalink: Optional: named budgets" href="#optional-named-budgets"><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">Named budgets is an optional feature that gives API callers the ability to manage <code>L1</code> contribution budget distribution across different types of attributions, addressing common challenges such as:</p> <ul dir="auto"> <li>Allocating the privacy budget between different types of attributions (e.g., biddable vs. non-biddable).</li> <li>Distributing the budget across multiple product categories to prevent any single product category from consuming all available privacy budget.</li> </ul> <p dir="auto"><a href="#attribution-source-registration">Source registrations</a> will accept an optional field <code>named_budgets</code>, which is a dictionary used to set the maximum contribution for each named budget for this source.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ ..., // existing fields "named_budgets": { "budgetName1": 32768, // Max contribution budget for budgetName1. "budgetName2": 32768 // Max contribution budget for budgetName2. } }"><pre><span class="pl-kos">{</span> ...<span class="pl-kos">,</span> <span class="pl-c">// existing fields</span> <span class="pl-s">"named_budgets"</span>: <span class="pl-kos">{</span> <span class="pl-s">"budgetName1"</span>: <span class="pl-c1">32768</span><span class="pl-kos">,</span> <span class="pl-c">// Max contribution budget for budgetName1.</span> <span class="pl-s">"budgetName2"</span>: <span class="pl-c1">32768</span> <span class="pl-c">// Max contribution budget for budgetName2.</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span></pre></div> <p dir="auto"><a href="#attribution-trigger-registration">Trigger registrations</a> will accept an optional field <code>named_budgets</code>, which will be used to select the named budget for the generated aggregatable report.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ ..., // existing fields "named_budgets": [ { "name": "budgetName1", "filters": {"source_type": ["navigation"]} } ] }"><pre><span class="pl-kos">{</span> ...<span class="pl-kos">,</span> <span class="pl-c">// existing fields</span> <span class="pl-s">"named_budgets"</span>: <span class="pl-kos">[</span> <span class="pl-kos">{</span> <span class="pl-s">"name"</span>: <span class="pl-s">"budgetName1"</span><span class="pl-kos">,</span> <span class="pl-s">"filters"</span>: <span class="pl-kos">{</span><span class="pl-s">"source_type"</span>: <span class="pl-kos">[</span><span class="pl-s">"navigation"</span><span class="pl-kos">]</span><span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-kos">]</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">The first named budget from the trigger that matches the source's filter data will be selected. If there is no budget name specified or no matching filters, the <code>L1</code> contribution budget will still be applied.</p> <p dir="auto">When generating an aggregatable report, in addition to performing the current <code>L1</code> budget limit check, the contributions for the report will be checked against the available budget with the selected budget name, if applicable. If the budget is insufficient, the aggregatable report will not be generated.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Data processing through a Secure Aggregation Service</h2><a id="user-content-data-processing-through-a-secure-aggregation-service" class="anchor" aria-label="Permalink: Data processing through a Secure Aggregation Service" href="#data-processing-through-a-secure-aggregation-service"><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 exact design of the service is not specified here. We expect to have more information on the data flow from reporter → processing origins shortly, but what follows is a high-level summary.</p> <p dir="auto">As the browser sends individual aggregatable reports to the reporting origin, the reporting origin organizes them into <a href="/WICG/attribution-reporting-api/blob/main/AGGREGATION_SERVICE_TEE.md#disjoint-batches">batches</a>. The adtech can then send these batches to the aggregation service.</p> <p dir="auto">The aggregation service will aggregate reports within a certain batch, and respond back with a summary report (aggregate histogram), i.e. a list of keys with associated <em>aggregate</em> values. It is expected that as a privacy protection mechanism, a certain amount of noise will be added to each output key's aggregate value.</p> <p dir="auto">Currently the aggregation service can be deployed on Amazon Web Services (AWS) and Google Cloud Platform (GCP). We expect to support other cloud providers in the future. See the <a href="https://github.com/privacysandbox/protected-auction-services-docs/blob/main/public_cloud_tees.md">Public Cloud TEE requirements explainer</a> for more details.</p> <p dir="auto">Trigger registration will accept an optional string field <code>aggregation_coordinator_origin</code> to allow developers to specify the deployment option for the aggregation service supported by the browser, e.g. the origin for the aggregation service deployed on AWS, GCP, and other platforms in the future.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ ..., // existing fields "aggregation_coordinator_origin": "https://publickeyservice.msmt.aws.privacysandboxservices.com", }"><pre><span class="pl-kos">{</span> ...<span class="pl-kos">,</span> <span class="pl-c">// existing fields</span> <span class="pl-s">"aggregation_coordinator_origin"</span>: <span class="pl-s">"https://publickeyservice.msmt.aws.privacysandboxservices.com"</span><span class="pl-kos">,</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">See <a href="https://github.com/WICG/attribution-reporting-api/blob/main/aggregation_coordinator_origin_allowlist.md">allowlist</a> of the aggregation service coordinator origins.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Privacy considerations</h2><a id="user-content-privacy-considerations" class="anchor" aria-label="Permalink: Privacy considerations" href="#privacy-considerations"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This proposal introduces a new set of reports to the API. Alone they do not add much meaningful cross-site information, so they are fairly benign. However, they contain encrypted payloads which allow aggregate histograms to be computed.</p> <p dir="auto">These histograms should be protected with various techniques with a trusted server system. For example, it is expected that the histograms will be subject to noise proportional to the <code>L1</code> budget. Additionally, most rate-limits (except for the maximum number of reports per source) used for event-level reports will also be enforced for aggregatable reports, which limit the total amount of information that can be sent out for any one user.</p> <p dir="auto">Servers will need to be implemented such that browsers can trust them with sensitive cross-site data. There are various technologies and techniques that could be employed (e.g. <a href="https://en.wikipedia.org/wiki/Trusted_execution_environment" rel="nofollow">Trusted Execution Environments</a>, <a href="https://en.wikipedia.org/wiki/Secure_multi-party_computation" rel="nofollow">Multi-party-computation</a>, audits, etc) that could satisfy browsers that data is safely aggregated and the output maintains proper privacy.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Differential Privacy</h3><a id="user-content-differential-privacy" class="anchor" aria-label="Permalink: Differential Privacy" href="#differential-privacy"><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 goal of this work is to have a framework which can support differentially private aggregate measurement. In principle this can be achieved if the aggregation service adds noise proportional to the <code>L1</code> budget in principle, e.g. noise distributed according to Laplace(L1/epsilon) should achieve epsilon differential privacy. With small enough values of epsilon, reports for a given source will be well-protected in an aggregate release.</p> <p dir="auto">Note: there are a few caveats about a formal differential privacy claim:</p> <ul dir="auto"> <li> <p dir="auto">The scope of privacy in the current design is not user-level, but per-source. See <a href="#more-advanced-contribution-bounding">More advanced contribution bounding</a> for follow-up work exploring tightening this.</p> </li> <li> <p dir="auto">Our plan is to adjust the level of noise added based on feedback during the origin trial period, and our goal with this initial version is to create a foundation for further exploration into formally private methods for aggregation.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Rate limits</h3><a id="user-content-rate-limits" class="anchor" aria-label="Permalink: Rate limits" href="#rate-limits"><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">Various rate limits outlined in the <a href="https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#reporting-cooldown--rate-limits">event-level explainer</a> should also apply to aggregatable reports. The limits should be shared across all types of reports.</p> </li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Ideas for future iteration</h2><a id="user-content-ideas-for-future-iteration" class="anchor" aria-label="Permalink: Ideas for future iteration" href="#ideas-for-future-iteration"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Worklet-based aggregation key generation</h3><a id="user-content-worklet-based-aggregation-key-generation" class="anchor" aria-label="Permalink: Worklet-based aggregation key generation" href="#worklet-based-aggregation-key-generation"><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">At trigger time, we could have a <a href="https://developer.mozilla.org/en-US/docs/Web/API/Worklet" rel="nofollow">worklet-style</a> API that allows passing in an arbitrary string of “trigger context” that specifies information about the trigger event (e.g. high fidelity data about a conversion). From within the worklet, code can access both the source and trigger context in the same function to generate an aggregate report. This allows for more dynamic keys than a declarative API (like the existing<a href="https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#triggering-attribution"> HTTP-based triggering</a>), but disallows exfiltrating sensitive cross-site data out of the worklet.</p> <p dir="auto">The worklet is used to generate histogram contributions, which are key-value pairs of integers. Note that there will be some maximum number of keys (e.g. 2^128 keys).</p> <p dir="auto">The following code triggers attribution by invoking a worklet.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="await window.attributionReporting.worklet.addModule( "https://reporter.example/convert.js"); // The first argument should match the origin of the module we are invoking, and // determines the scope of attribution similar to the existing HTTP-based API, // i.e. it should match the "attributionreportto" attribute. // The last argument needs to match what AggregateAttributionReporter uses upon // calling registerAggregateReporter window.attributionReporting.triggerAttribution("https://reporter.example", <triggerContextStr>, "my-aggregate-reporter");"><pre><span class="pl-k">await</span> <span class="pl-smi">window</span><span class="pl-kos">.</span><span class="pl-c1">attributionReporting</span><span class="pl-kos">.</span><span class="pl-c1">worklet</span><span class="pl-kos">.</span><span class="pl-en">addModule</span><span class="pl-kos">(</span> <span class="pl-s">"https://reporter.example/convert.js"</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// The first argument should match the origin of the module we are invoking, and</span> <span class="pl-c">// determines the scope of attribution similar to the existing HTTP-based API,</span> <span class="pl-c">// i.e. it should match the "attributionreportto" attribute.</span> <span class="pl-c">// The last argument needs to match what AggregateAttributionReporter uses upon</span> <span class="pl-c">// calling registerAggregateReporter</span> <span class="pl-smi">window</span><span class="pl-kos">.</span><span class="pl-c1">attributionReporting</span><span class="pl-kos">.</span><span class="pl-c1">triggerAttribution</span><span class="pl-kos">(</span><span class="pl-s">"https://reporter.example"</span><span class="pl-kos">,</span> <span class="pl-c1"><</span><span class="pl-ent">triggerContextStr</span><span class="pl-c1">></span>, "my-aggregate-reporter");</pre></div> <p dir="auto">Internally, the browser will look up to see which source should be attributed, similar to how <a href="https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md#trigger-attribution-algorithm">attribution</a> works in the HTTP-based API. Note here that only a single source will be matched.</p> <p dir="auto">Here is <code>convert.js</code> which crafts an aggregate report.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="class AggregateAttributionReporter { // attributionSourceContext set as "<campaignid>,<geoid>" processAggregate(triggerContext, attributionSourceContext, sourceType) { let [campaign, geo] = attributionSourceContext.split(',').map( x => parseInt(x, 10)) let purchaseValue = parseInt(triggerContext, 10) histogramContributions = [ {key: campaign, value: purchaseValue}, {key: geo, value: purchaseValue}, ]; return { histogramContributions: histogramContributions, } } } // Bound classes will be invoked when an attribution triggered on this document // is successfully attributed to a source whose reporting origin matches the // worklet origin. registerAggregateReporter("my-aggregate-reporter", AggregateAttributionReporter);"><pre><span class="pl-k">class</span> <span class="pl-v">AggregateAttributionReporter</span> <span class="pl-kos">{</span> <span class="pl-c">// attributionSourceContext set as "<campaignid>,<geoid>"</span> <span class="pl-en">processAggregate</span><span class="pl-kos">(</span><span class="pl-s1">triggerContext</span><span class="pl-kos">,</span> <span class="pl-s1">attributionSourceContext</span><span class="pl-kos">,</span> <span class="pl-s1">sourceType</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-k">let</span> <span class="pl-kos">[</span><span class="pl-s1">campaign</span><span class="pl-kos">,</span> <span class="pl-s1">geo</span><span class="pl-kos">]</span> <span class="pl-c1">=</span> <span class="pl-s1">attributionSourceContext</span><span class="pl-kos">.</span><span class="pl-en">split</span><span class="pl-kos">(</span><span class="pl-s">','</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">map</span><span class="pl-kos">(</span> <span class="pl-s1">x</span> <span class="pl-c1">=></span> <span class="pl-en">parseInt</span><span class="pl-kos">(</span><span class="pl-s1">x</span><span class="pl-kos">,</span> <span class="pl-c1">10</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-k">let</span> <span class="pl-s1">purchaseValue</span> <span class="pl-c1">=</span> <span class="pl-en">parseInt</span><span class="pl-kos">(</span><span class="pl-s1">triggerContext</span><span class="pl-kos">,</span> <span class="pl-c1">10</span><span class="pl-kos">)</span> <span class="pl-s1">histogramContributions</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span> <span class="pl-kos">{</span><span class="pl-c1">key</span>: <span class="pl-s1">campaign</span><span class="pl-kos">,</span> <span class="pl-c1">value</span>: <span class="pl-s1">purchaseValue</span><span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-kos">{</span><span class="pl-c1">key</span>: <span class="pl-s1">geo</span><span class="pl-kos">,</span> <span class="pl-c1">value</span>: <span class="pl-s1">purchaseValue</span><span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-k">return</span> <span class="pl-kos">{</span> <span class="pl-c1">histogramContributions</span>: <span class="pl-s1">histogramContributions</span><span class="pl-kos">,</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-c">// Bound classes will be invoked when an attribution triggered on this document</span> <span class="pl-c">// is successfully attributed to a source whose reporting origin matches the</span> <span class="pl-c">// worklet origin.</span> <span class="pl-en">registerAggregateReporter</span><span class="pl-kos">(</span><span class="pl-s">"my-aggregate-reporter"</span><span class="pl-kos">,</span> <span class="pl-v">AggregateAttributionReporter</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <p dir="auto">This worklet approach provides greatly enhanced flexibility at the cost of complexity. It introduces a new security / privacy boundary, and there are several edge cases that must be handled carefully to avoid data loss (e.g. the document being destroyed while the worklet is processing, unless a <code>keepalive</code>-style mode for worklets is introduced). These issues must be solved before this design could be considered.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Custom attribution models</h3><a id="user-content-custom-attribution-models" class="anchor" aria-label="Permalink: Custom attribution models" href="#custom-attribution-models"><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 worklet based scheme possibly allows for more flexible attribution options, including specifying partial “credit” for multiple previous attribution sources that would provide value to advertisers that are interested in attribution models other than last-touch.</p> <p dir="auto">We should be careful in allowing reports to include cross site information from multiple sites, as it could increase the risk of cross site tracking.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">More advanced contribution bounding</h3><a id="user-content-more-advanced-contribution-bounding" class="anchor" aria-label="Permalink: More advanced contribution bounding" href="#more-advanced-contribution-bounding"><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 might want to consider bounding contribution at levels other than the source event level in the future for more robust privacy protection. For instance, we could bound user contributions per trigger event, or even by {source site, destination site, day} for a more user-level bound.</p> <p dir="auto">This would likely come at the cost of some utility and complexity, as budgeting across multiple source events may not be straightforward.</p> <p dir="auto">Additionally, there are more sophisticated techniques that can optimize utility and privacy if we bound more than just the L1 norm of the aggregate histogram. For instance, we could impose a stricter Linf bound (i.e. bounding the contribution to any one bucket). Care should be taken to ensure that either:</p> <ul dir="auto"> <li>A proper compromise is met across various use-cases</li> <li>We can support multiple types of contribution bounding for different reporting origins without introducing privacy leaks</li> </ul> <p dir="auto">See <a href="https://github.com/WICG/attribution-reporting-api/issues/249" data-hovercard-type="issue" data-hovercard-url="/WICG/attribution-reporting-api/issues/249/hovercard">issue 249</a> for more details.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Choosing among aggregation services</h3><a id="user-content-choosing-among-aggregation-services" class="anchor" aria-label="Permalink: Choosing among aggregation services" href="#choosing-among-aggregation-services"><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 server can add an optional <code>alternative_aggregation_mode</code> string field:</p> <div class="highlight highlight-source-httpspec notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Attribution-Reporting-Register-Trigger: {..., "aggregatable_trigger_data": ..., "aggregatable_values": ..., "alternative_aggregation_mode": "experimental-poplar"}"><pre><span class="pl-s"><span class="pl-v">Attribution-Reporting-Register-Trigger:</span> {..., "aggregatable_trigger_data": ..., "aggregatable_values": ..., "alternative_aggregation_mode": "experimental-poplar"}</span></pre></div> <p dir="auto">The optional field will allow developers to choose among different options for aggregation infrastructure supported by the user agent. This value will allow experimentation with new technologies, and allows us to try out new approaches without interfering with core functionality provided by the default option. The <code>"experimental-poplar"</code> option will implement a protocol similar to <a href="https://github.com/cfrg/draft-irtf-cfrg-vdaf/blob/main/draft-irtf-cfrg-vdaf.md#poplar1-poplar1">poplar VDAF</a> in the <a href="https://datatracker.ietf.org/doc/draft-gpew-priv-ppm/" rel="nofollow">PPM Framework</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Considered alternatives</h2><a id="user-content-considered-alternatives" class="anchor" aria-label="Permalink: Considered alternatives" href="#considered-alternatives"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">“Count” vs. “value” histograms</h3><a id="user-content-count-vs-value-histograms" class="anchor" aria-label="Permalink: “Count” vs. “value” histograms" href="#count-vs-value-histograms"><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">There are some use-cases which require something close to binary input (i.e. counting conversions), and other conversions which require summing in some discretized domain (e.g. summing conversion value).</p> <p dir="auto">For simplicity in this API we are treating these exactly the same. Count-based approaches could do something like submitting two possible values, 0 for 0 and MAX_VALUE for 1, and consider the large space to be just a discretized domain of fractions between 0 and 1.</p> <p dir="auto">This has the benefit of keeping the aggregation infrastructure generic and avoids the need to “tag” different reports with whether they represent a coarse-grained or fine-grained value.</p> <p dir="auto">In the end, we will use this MAX_VALUE to scale noise via computing the sensitivity of the computation, so submitting “1” for counts will yield more noise than otherwise expected.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Binary report format</h3><a id="user-content-binary-report-format" class="anchor" aria-label="Permalink: Binary report format" href="#binary-report-format"><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 binary report format like CBOR could streamline AEAD authentication by passing raw bytes directly to the reporting origin, which could be passed through directly to an aggregation service. This design would avoid parsing / serialization errors in constructing authenticated data necessary to decrypt the payload.</p> <p dir="auto">However, binary formats are not as familiar to developers, so there is an ergonomics tradeoff to be made here.</p> </article></div><button hidden=""></button></section></div></div></div> <!-- --> <!-- --> </div></div></div><div class="Box-sc-g0xbh4-0"></div></div></div></div></div><div id="find-result-marks-container" class="Box-sc-g0xbh4-0 cCoXib"></div><button hidden="" data-testid="" data-hotkey-scope="read-only-cursor-text-area"></button><button hidden=""></button></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-app> </turbo-frame> </div> </turbo-frame> </main> </div> </div> <footer class="footer pt-8 pb-6 f6 color-fg-muted p-responsive" role="contentinfo" > <h2 class='sr-only'>Footer</h2> <div class="d-flex flex-justify-center flex-items-center 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