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 0xfbf786a0d80de4e458c5f2c57dfcf872055ce8550fe998c056a56b4f38cbaa18. Chain 2 (Bitcoin): anchored in block 954028 (2026-06-17T01:08:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39da277d-50e1-4213-abf3-0b39b3b10fda.json and https://artists.proofprofile.net/proofs/artist/39da277d-50e1-4213-abf3-0b39b3b10fda.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
A Classic Relaxing Collection: Chopin, Schubert & Schumann
Niccolò Paganini,Gioacchino Rossini, Antonio Vivaldi: Classical Tour of Italy
Pablo De Sarasate, Brahms, Bach: Violin Orchestra
Felix Mendelssohn, Richard Wagner, Johann Pachelbel: Classical Wedding
Gabriel Fauré, Camille Saint-Saens & Hector Berlioz: Classical Sounds of France