1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 artist was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051d6f1320636f3e70756d8c50d7551c3f2e98b4dc55dcacb990b8d241263d69. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d5f7f05-fa8e-404c-b6f9-89b7a314e28b.json and https://artists.proofprofile.net/proofs/artist/3d5f7f05-fa8e-404c-b6f9-89b7a314e28b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Complete Columbia Recordings (1975-1977)