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 0x7261849f1b5d42a2209116a6d9d77adb995ce89b36516851022a8c172e373348. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d38dc6a3-2b19-4ff9-8eec-5db9de6ca20a.json and https://artists.proofprofile.net/proofs/artist/d38dc6a3-2b19-4ff9-8eec-5db9de6ca20a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mendelssohn : Symphony No. 4 In A Major, Op. 90, 'Italian'