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 0x0e761ecb39064dac0465333ae13a361d252fd321982c73490b1332a5de9dec3a. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/442a1435-c194-4f8c-bb58-d6bc0c597770.json and https://artists.proofprofile.net/proofs/artist/442a1435-c194-4f8c-bb58-d6bc0c597770.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chopin : Waltz 'Grand Valse Brillante' E Flat Major Op.18
Piano Sonata No.14 In C Sharp Minor, Op.27 No.2 'Moonlight' (3. Presto)
Chopin Prelude No.15 In D Flat Major Op.28-15 Raindrop
Chopin: 4 Mazurkas, Op.17 No.1 in B Flat Major
Chopin Nocturnes No.2 In E Flat Major Op.9-2
4 Impromptus Op.90 D.899 (Allegretto): No.4 In A Flat Major