thumb|Eighteenth century Castilian fandango dancers (by Pierre Chasselat) (1753–1814) thumb|right|250px|Fandango rhythm.Blatter, Alfred (2007). Revisiting music theory: a guide to the practice, p. 28.
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457bf15d426bb5be20a72d92eaeb92fd902b751f43165d2c0baf35d1c46d6355. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af22986d-921a-43ea-8e55-b9d6e1fdcc52.json and https://artists.proofprofile.net/proofs/artist/af22986d-921a-43ea-8e55-b9d6e1fdcc52.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).