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 0xf98955fcd197c96db5562e3a604ce062f46d0653dd81aa0c4f9d5ec9414a5f73. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a892d36b-ee95-40ef-adf0-da6c8fd9b543.json and https://artists.proofprofile.net/proofs/artist/a892d36b-ee95-40ef-adf0-da6c8fd9b543.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Matuszczak (Variations on a theme by Bernadetta Matuszczak „Libera Me")