thumb|Taxicab 1909 Unic was a French manufacturer founded in 1905, and active as an automobile producer until July 1938. After this the company continued to produce commercial vehicles, retaining i
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 0x7061ffa2ba36d26465b392f22cb5bb6795292c2eaeed7f405dd14bbd3f5779e3. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dfff08b6-cbfd-4804-a007-d78f69cea4cd.json and https://artists.proofprofile.net/proofs/artist/dfff08b6-cbfd-4804-a007-d78f69cea4cd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).