Plaque may refer to: Commemorations or awards Commemorative plaque, a plate, usually fixed to a wall or other vertical surface, meant to mark an event, person, etc. Memorial Plaque (medallion), iss
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 0x7dc361009301a26745f972542bb9834c506a4518e32c6cba9f0d48b8036f7b16. Chain 2 (Bitcoin): anchored in block 954047 (2026-06-17T04:56:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/427052dc-37ae-4d53-bdaa-68db8faaf9cb.json and https://artists.proofprofile.net/proofs/artist/427052dc-37ae-4d53-bdaa-68db8faaf9cb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).