thumb| Wolfram von Eschenbach and his squire (Codex Manesse, 14th century) thumb|The Squire - Ellesmere Chaucer In the Middle Ages, a squire was the shield- or armour-bearer of a knight. Boys served
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 0xb79d403dea46e0a3b3682b9f629fe61f93c79dd8205074befd2550c76a18a35b. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d66d1797-208e-4207-95bf-90e30bfd60fc.json and https://artists.proofprofile.net/proofs/artist/d66d1797-208e-4207-95bf-90e30bfd60fc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).