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 0x006f61a77ce79f2183836afe57d62b2fbabd68726254f08660427d35643af419. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/15fa7516-6b66-4126-add4-3fc0ba2a331e.json and https://artists.proofprofile.net/proofs/artist/15fa7516-6b66-4126-add4-3fc0ba2a331e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Musikk for Eufonium - Version for Euphonium, Piano and Percussion, Pt. 2