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 0xfca76b58f4621bf291a4da34184255f9bae54b7a66cb7f072c512a81a0804df9. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bcd9cbed-d867-43a7-95b4-47b64277b090.json and https://artists.proofprofile.net/proofs/artist/bcd9cbed-d867-43a7-95b4-47b64277b090.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sermisy: Languir me fais - Purcell: O Dieu qui vois et bénis nos pleurs - Ardeau: Belle qui tiens ma vie
Morax: Prière du Rütli - Budry: Pour toi, pays - Kedrov: Pater Noster