thumb|European mink (Mustela lutreola) Mink are dark-coloured, semiaquatic, carnivorous mammals in the genera Mustela and Neogale and part of the family Mustelidae, which also includes weasels, stoats
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 0x26d97c7ea90f3bbaf255ff4eaacc599dcaaa250e9d4cdfa514a71c5f93448c34. 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/b92c7a83-d8c5-4735-bd5f-322f58eddae6.json and https://artists.proofprofile.net/proofs/artist/b92c7a83-d8c5-4735-bd5f-322f58eddae6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).