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 0x3e25b207802ebb888e23c345c0a3d90f7591a0c1ed2a5dc4a019012786cb3cbc. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d5889ef7-9ad4-4e5f-bc77-402b7d06bfe4.json and https://artists.proofprofile.net/proofs/artist/d5889ef7-9ad4-4e5f-bc77-402b7d06bfe4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
That Old Gang Of Mine / Martin, Bogan & Armstrong