United Blood is the debut EP 7" from New York hardcore band Agnostic Front. It was released in 1983 on their own AF Records label. 1,000 copies in total were pressed. In 2009, Bridge9 re-released the
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e069fc9747ed22ee55b79fcb4b479fd3b301aefa558f01ed85924306ff7cda0. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/15f65a4b-896b-4636-bb30-156a9365a2ce.json and https://artists.proofprofile.net/proofs/artist/15f65a4b-896b-4636-bb30-156a9365a2ce.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).