thumb|Architect’s House (designed by Ernst May). Photograph by Tim Benton. CON_B04373_F002_028. The Courtauld Institute of Art. CC-BY-4.0. Tim Benton (born 21 June 1945, Rome) is Professor Emeritus i
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 0x830a2c9beb657d999ad3107c88de7213c65a034e385ddff00354ef54937fd5bf. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2af6363-74f1-47ab-8033-c9144cd46eb0.json and https://artists.proofprofile.net/proofs/artist/c2af6363-74f1-47ab-8033-c9144cd46eb0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).