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 0x69c39a404c3803aac4212c52db23da148116e5a453c322d40f02f171c3aba08e. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e1cd86b-0338-402c-97c3-a81970d416ce.json and https://artists.proofprofile.net/proofs/artist/0e1cd86b-0338-402c-97c3-a81970d416ce.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Festival international Nuits d'Afrique 33ème édition - Compilation 2019