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 0x9adf1ffc4f647fafb3da2767ed71388dfc003fdd49852f3e5b8c6e49ca910ce9. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e10c925-d51b-47cd-b516-f7c7fd55afd3.json and https://artists.proofprofile.net/proofs/artist/4e10c925-d51b-47cd-b516-f7c7fd55afd3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Medley: Claire de lune/Opus no 2 Moonlight sonata 1st movement/Nocturnes, Op. 9 No. 2/Nocturnes, No. 21/Waltz In A minor, B. 150, Op. Posth/Ave Maria(Bach-Gounod)/Canon in D/Rondò alla Turca, K.331/Swan lake/Hungarian Rhapsody No. 2/Bagatelle No. 25