thumb|Staedtler HB graphite pencils thumb|Coloured pencils (Caran d'Ache) thumb|A typical modern-day pencil. A pencil () is a writing or drawing implement with a solid pigment core in a protective c
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 0xb3994ec785f3c02d7ab5ab06d08a2c95d4e6b0f2e33b9773a9f93cd866fdb4df. Chain 2 (Bitcoin): anchored in block 953851 (2026-06-15T23:06:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/01deba14-f5d4-415f-be23-b67561c6d6cf.json and https://artists.proofprofile.net/proofs/artist/01deba14-f5d4-415f-be23-b67561c6d6cf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).