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 0xccbb50cbf7793afb06084737bfa5c7479763244655680a32baa7fc3409998c23. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aae146cd-d51b-4361-be82-ff7e4d5392c7.json and https://artists.proofprofile.net/proofs/artist/aae146cd-d51b-4361-be82-ff7e4d5392c7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Miniatures, Vol. 1: Kabalevsky, Prokofiev
Miniatures, Vol. 2: Music for Children by Turina, Rebikov and Bartok
Miniature (Vol. 2) [Music for Children by Turina, Rebikov, Bartok]
Miniature (Vol. 1) [Kabalevky, Prokofiev]