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This change requires a valid signed Blossom authorization request and current relay membership for every media GET and HEAD request. It removes the unauthenticated compatibility path and updates desktop reads to send the required authorization. This blocks anonymous retrieval and access after relay-membership revocation. It does not yet bind a blob to its originating channel, so someone removed from a private channel can still read a known blob while remaining a relay member. That channel-ACL follow-up remains required before closing the full finding. ## Testing - `git diff --check origin/main...codex/security-media-read-auth` - Rebased onto `origin/main` at `5c98932` - Full CI pending Originating Buzz thread: `buzz://message?channel=3928fe05-df61-4b5d-b9c7-d623b9b10ea1&id=3c6c02312f763fbe0d2bfc33a6c1a362f91d0354f3d18b039cf7a0558c1439d1` --------- Signed-off-by: Jordan Mecom <jm@squareup.com> Signed-off-by: Alex Rosenzweig <arosenzweig@squareup.com> Signed-off-by: Eli Foster <efoster@squareup.com> Co-authored-by: Eli Foster <efoster@squareup.com> Co-authored-by: Claude Opus 5 <noreply@anthropic.com>