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 0xe64096718d1c70fa44c7e1f4013f9a9aa34a3eba83a28b49e6b0759a3a6eb86f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6222c047-22ef-4552-bfdf-69bcd8858473.json and https://artists.proofprofile.net/proofs/artist/6222c047-22ef-4552-bfdf-69bcd8858473.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach: Prelude and Fugue, BWV 552 - Brahms: 3 Choralforspiele - Franck: Choral No. 2 in B Minor, FWV 39
Bach - Alain - Gagnebin - Segond: Les grandes orgues de la Cathédrale Saint-Pierre de Genève
Bach – Brahms – Franck: Les grandes orgues de la cathédrale Saint-Pierre à Genève
Bach: BWV 565, 654, 655, 659, 667 - Jehan Alain - César Franck
Documents sonores à Saint-Pierre (Grandes orgues de la Cathédrale Saint-Pierre de Genève)