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The Block tenant links a member's existing key to their account the first time it issues them a relay assertion ([#8700](https://github.com/block/buzz/pull/8700)). Mobile never backed that key up. Desktop FI builds back up to the tenant, but on mobile a Block key that lives on just one phone can't be recovered once Block turns backups on. Mobile now backs up the organization relay's key to the organization account: - After every organization assertion, it reads `/v1/buzz/nsec-backups/status`. If the key is already listed, there's nothing to do. - If the bound key isn't listed, it enrolls, seals with HPKE and uploads, using the existing `HostedBackupService`. That service now uses its account client's own origin, so organization and hosted backups never share a pending envelope. Hosted storage keys and receipts don't change. - If the upload's outcome is unknown, the saved envelope is replayed exactly at the next assertion. - A tenant without backups answers 404 (Block production today). That, and other definitive refusals, stop attempts for that account and key until the next launch. Any other failure is retried at a later assertion, after a delay that doubles from 1 minute to at most 1 hour. Assertions renew while the app runs, so retries continue until the tenant lists the key. - Concurrent assertions share one attempt. - iOS 16 can't seal, so it sends nothing. Backup failures never affect the relay connection. There's no UI. As in mobile's hosted onboarding, the backup happens automatically. Desktop asks for an explicit backup choice first, so whether mobile should too is a product call. ### Validation Added tests (`organization_key_backup_test.dart`), which run through real `HostedRelayAuth` assertion issuance with only HTTP faked: - An uncertain upload is replayed with the same envelope at the next assertion, then nothing more is sent in that launch. - A key that's already listed sends no upload and drops a leftover envelope. - A tenant without backups is asked once per launch. - A device that can't seal sends nothing. - A failed status read is retried after the delay, not at the immediate re-assertion. A key the tenant bound to someone else is never uploaded, and its checks keep going at growing intervals. - Two concurrent assertions make one attempt. - A failing seal-capability check sends nothing. Removing the assertion hook fails 4 of the 6 tests. Removing the shared attempt or the retry delay fails its test. Full `mobile-check` and `mobile-test` pass. Device (iPhone 12 mini, release build) against bb-block staging, where backups are configured and the relay enforces NIP-FI, with an existing Block SSO session: - On launch the app asserts, reads backup status and finds this key listed, so it uploads nothing. The relay connection and channel list are unaffected. - A test-only build that ignored the listed shortcut enrolled, sealed with the staging tenant's real KMS-backed key and uploaded, with a stored response in about 360 ms. That re-stored my own test key. - The final build at this head was then reinstalled and relaunched with no backup failure logged. The device's staging community was added in an earlier run, because adding an enforcing organization relay by link is still blocked ([#8791](https://github.com/block/buzz/issues/8791)). An independent agent review ran; its should-fix items are addressed in the second commit. Codex's retry finding is addressed in the third, which changes only failure-path timing; the device-tested success path is unchanged. Wes's optional review notes are addressed in the last three: an exact-timing retry test, backup queues per account origin (a stalled organization backup no longer delays hosted onboarding's backup, with a test), and a subject check on each enrollment and upload request. Full `mobile-check` and `mobile-test` pass at the head. Human testing is waived under the mobile automated-testing policy; the device run above covers the at-risk flows (organization assertion, relay connection, backup status, enrollment, sealing and upload). buzz-review-completed 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: Tom Brow <tomb@squareup.com> Co-authored-by: Tom Brow <tomb@squareup.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>