thumb|250px|Henny Huisman during TV recordings in the Efteling in 1986 Hendrikus Josephus Huisman (born 18 June 1951) is a Dutch television presenter and musician. Biography Huisman had a catholic u
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 0xcb72fa92d40def8bc093de5392f77e871cd62f10c5772108b6e2c38d3a3f6e74. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c5589494-0bfc-408c-8238-485e8d6cdc86.json and https://artists.proofprofile.net/proofs/artist/c5589494-0bfc-408c-8238-485e8d6cdc86.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).