thumb|upright|A sundial inscribed () is a Latin aphorism, usually translated 'seize the day', taken from book 1 of the Roman poet Horace's work Odes (23 BC).Quintus Horatius Flaccus, Carmina, Liber
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 0x587c531b06f75c469622913e7c43e1e5d1ad3812922ee1b557faacc6cdebb382. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ae3c9d56-06b8-40ee-8e70-914d2036f81c.json and https://artists.proofprofile.net/proofs/artist/ae3c9d56-06b8-40ee-8e70-914d2036f81c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).