thumb|Music box by Polyphon-Musikwerke in Leipzig, Germany thumb|A music box thumb|Interior of a large music box at the Museu de la Música de Barcelona in Catalonia A music box (American English) or
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 0xa2c52be935cedc718b1adbc638fe42812a3626a97ca6c4ec280cf1b83b6ffc44. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d2f0e52c-8d5c-4560-9935-90302e01f553.json and https://artists.proofprofile.net/proofs/artist/d2f0e52c-8d5c-4560-9935-90302e01f553.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).