thumb|upright|Ascophyllum nodosum exposed to the sun in Nova Scotia, Canada|alt=Photo of seaweed with small swollen areas at the end of each frond thumb|Dead man's fingers (Codium fragile) off the Mas
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 0xb5dc71cf58229e5a593291d4695b480dd45be36f03f0c7fde8ebe9031d9da689. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d0b2304-c1da-46ea-ab3b-4ce325ce70cf.json and https://artists.proofprofile.net/proofs/artist/0d0b2304-c1da-46ea-ab3b-4ce325ce70cf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).