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 0x861139417921da582ba519899c32f9506f002d62e0c937d72d70e27f8d31b738. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/09b4b3b2-4699-499e-947a-9be53b771db2.json and https://artists.proofprofile.net/proofs/artist/09b4b3b2-4699-499e-947a-9be53b771db2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bronsart & Urspruch: Piano Concertos (Hyperion Romantic Piano Concerto 77)