thumb|right|Loan document issued by the Bank of Petrevene, Bulgaria, dated 1936 In finance, a loan is the tender of money by one party to another with an agreement to pay it back. The recipient, or b
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841bdebbfca0d78db25ef3e0598ebc19cea752cf6c9ee5e0f2cac18ca266d87b. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a2c4780-c81d-40c9-b22c-180f5f1a8617.json and https://artists.proofprofile.net/proofs/artist/9a2c4780-c81d-40c9-b22c-180f5f1a8617.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).