thumb|Repair work (right) on Mishima ware -type tea bowl with kintsugi gold lacquer, 16th century thumb|Small repair (top) on Nabeshima ware dish with hollyhock design, over-glaze enamel, 18th century
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ac201e47aa039a8d44ac804d55cad0ec76c43b24c30acda227a5a3092a8405. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be34a3a9-340d-403f-99fb-ddcdb174caaa.json and https://artists.proofprofile.net/proofs/artist/be34a3a9-340d-403f-99fb-ddcdb174caaa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).