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 0x28e3de6c85898b681e2245b8e1abfcbb2f0e31345063540568824c9f60685a0d. 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/dff6fcb2-5dba-40ac-b54e-6b7d3c69ab28.json and https://artists.proofprofile.net/proofs/artist/dff6fcb2-5dba-40ac-b54e-6b7d3c69ab28.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Debussy: Sonata for Flute, Viola and Harp - Jongen: Pieces for Flute, Cello & Harp - Martin: Pavane
Jolivet: Chant de Linos, Sonatine - Ravel: Introduction et Allegro - Debussy: Sonate for Flute, Alto and Harp
Nonetto: Works by Nino Rota, Hanns Eisler & Bohuslav Martinů
The American Album: Works by John Adams, Aaron Copland & Wynton Marsalis