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 0xc8a7922f0e92e51939debe8c755e9ad387e6ea494b0fbeb67b90af75434c02d7. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5e7fa3c4-fa04-46f8-90f5-42b7cf815f84.json and https://artists.proofprofile.net/proofs/artist/5e7fa3c4-fa04-46f8-90f5-42b7cf815f84.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Joan Lamote de Grignon i Ricard Lamote de Grignon: Obres per a Banda Simfònica
2017 WASBE International Biennial Conference: Banda Municipal de Barcelona (Live)