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 0x823e520e83ed89e5893854cad5d12057d44929089ef02b174e1b122e2883478b. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2157a183-9ed4-445e-bc8a-1efa68d0da1f.json and https://artists.proofprofile.net/proofs/artist/2157a183-9ed4-445e-bc8a-1efa68d0da1f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
A Musicall Dreame: Ayres & Instrumental Music by Farnaby, Dowland, Jones & Coprario