thumb|A glass of cow milk thumb|Cows in a rotary milking parlor Milk is a usually white liquid food (but can be shades of yellow, cream, pink, or even brown) produced by the mammary glands of lactatin
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 0x8d4d918d34cf156ff7c891ed6a02ab8168d7c34d817f8da376cf2b9a6a34be02. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f3d3401-702e-4023-a1ea-8c60323dab48.json and https://artists.proofprofile.net/proofs/artist/5f3d3401-702e-4023-a1ea-8c60323dab48.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).