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 0x85c8d7d900293b78f4419d219ec068045a74cef838d2e47394a6bb934f8eda2b. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9fbda781-d026-4e53-85f5-641dc408b96b.json and https://artists.proofprofile.net/proofs/artist/9fbda781-d026-4e53-85f5-641dc408b96b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Duo Arrangements - Bach, J.S. / Sweelinck, J.P. / Buxtehude, D. / Mozart, W.A. / Mendelssohn, Felix / Brahms, J.