thumb|Macon-Knoxville, GA Store Ledger, 1825–1831. A ledger is a book or collection of accounts in which accounting transactions are recorded. Each account has: an opening or brought-forward balance;
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 0xc782361dd6bdad99ff94732290f2201232e97727d90b6105457c115c75d376c2. Chain 2 (Bitcoin): anchored in block 954097 (2026-06-17T13:13:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7b43f156-fe29-43ae-ba72-e1f8ea09a4fe.json and https://artists.proofprofile.net/proofs/artist/7b43f156-fe29-43ae-ba72-e1f8ea09a4fe.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).