thumb|200px|The original cover of Thomas Hobbes's work Leviathan (1651), in which he discusses the concept of the social contract theory In moral and political philosophy, social contract is an idea,
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 0x2b4071d597a76971ca0b8efd1dc7ace3c981b9e93bc05ec61786b0aefc395269. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e55b569d-e1f7-4d83-a002-54b6fa509220.json and https://artists.proofprofile.net/proofs/artist/e55b569d-e1f7-4d83-a002-54b6fa509220.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.