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Claude
b0e3594eaa
Non-ratcheted async key rotation to remove members from a channel or (root
scope) the whole community, pinned to Concord v2 (Armada rekey.ts):
- RekeyPayload: the 72-byte scope_id||epoch_be8||new_key blob codec
- RekeyBlob: per-recipient {locator, wrapped} entry
- ConcordRekey: blobFor (locator = recipient pseudonym; wrapped = base64 payload
NIP-44-encrypted under the rotator<->recipient pairwise key), kind-3303 rumor
tags (scope/newepoch/prevepoch/prevcommit/chunk) and content codec, and
findNewKey (recipient computes their locator, matches, decrypts, verifies
scope+epoch) with absence == removal
Test proves remaining members recover the rotated key while a removed member
finds no matching blob, and that the locator is epoch-bound. Green on
:quartz:jvmTest.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CzJ2Cwo8tg4oZq43oRa3ig