250px|right|thumb|Mesopotamia in the time of Hammurabi Larsa (,ETCSL. The Lament for Nibru. Accessed 19 Dec 2010. read LarsamkiETCSL. The Temple Hymns. Accessed 19 Dec 2010.), also referred to as Lara
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 0x8fa6c38e860ce33487e615cd3c325cb574f917d0cf65d4803ae04bdad451973c. Chain 2 (Bitcoin): anchored in block 953860 (2026-06-15T23:55:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02bd0761-5abc-4779-ac38-ff7b02a326b9.json and https://artists.proofprofile.net/proofs/artist/02bd0761-5abc-4779-ac38-ff7b02a326b9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).