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 entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da0fc9a80455665ec0e790e110857796dc357b7b361a41149555865209926d8. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9478597e-40e6-4604-baf6-3239e90082e4.json and https://artists.proofprofile.net/proofs/artist/9478597e-40e6-4604-baf6-3239e90082e4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Barrelhouse, Blues & Boogie Woogie, Vol. 4
Rhythm & Blues 1952-1959 - Music Sampler - Volume 2