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 0xba6f23d808bde3e95a492ad830981fc313f0419af7b47c52113fd91ed972189c. Chain 2 (Bitcoin): anchored in block 953973 (2026-06-16T16:37:07Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a43e061-9511-411c-8b74-031bdd5d61a8.json and https://artists.proofprofile.net/proofs/artist/2a43e061-9511-411c-8b74-031bdd5d61a8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach: Partita No. 2 in C Minor, BWV 826 - Mozart: Fantasia in C Minor, K. 475 - Piano Sonata No. 14 in C Minor, K. 457 - Beethoven: Piano Sonata No. 8 in C Minor, Op. 13, "Grande Sonate Pathétique"
Brahms: Balladen Op. 10, Intermezzi Op. 117, Klavierstücke Op. 118