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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1571faceaa4fe526a6c611a75d7f5274e558ed86b31e9d861b0e0a0ebe22bc9. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/45f28b31-a16f-455f-ba09-9b3812c7b976.json and https://artists.proofprofile.net/proofs/artist/45f28b31-a16f-455f-ba09-9b3812c7b976.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach: Goldberg-Variationen (Aria mit 30 Veränderungen)
J. S. Bach: Sechs Französische Suiten, BWV 812 - 817
Bach: Kleine Präludien, 15 Inventionen & 15 Sinfonien
J. S. Bach: Englische Suite Nr. 2, 4 und 5
J. S. Bach: Englische Suite Nr. 1, BWV 806
J. S. Bach: Englische Suite Nr. 3, BWV 808
J. S. Bach: Englische Suite Nr. 6, BWV 811
Notenbüchlein Anna Magdalena Bach & Klavierbüchlein Wilhelm Friedmann Bach (unvollendete Werke wurden beendet)