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 0x00397f7f9463a2d045ef9c5d282c103b0762d4e8c2a53141c2a82066addf0c1d. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b7484bb9-d829-42b3-9342-a6a27d3d2106.json and https://artists.proofprofile.net/proofs/artist/b7484bb9-d829-42b3-9342-a6a27d3d2106.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Szymanowski: String Quartet No. 2, Op. 56 - Beethoven: String Quartet No. 1 in F Major, Op. 18 No. 1