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 0x2c70b16aff0eb184459b5fe8dbfe4092805109d7fe4d61b71dbac00670878e49. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4d92e165-2179-49d2-a0e0-3f7ae4a5981f.json and https://artists.proofprofile.net/proofs/artist/4d92e165-2179-49d2-a0e0-3f7ae4a5981f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Festival International de Piano La Roque d'Anthéron 2023