thumb|upright=1.2| Royal Marines from 40 Commando on patrol in the Sangin area of Afghanistan are picturedA commando is a combatant, or operative of an elite light infantry or special operations force
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 0x7e0669f75ac8d6d720e15b2f1b67039c8be7c1178f1f3b67501883140583ad48. Chain 2 (Bitcoin): anchored in block 954046 (2026-06-17T04:53:03Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/41155c56-27a8-46ae-837e-e0a3e0bc4930.json and https://artists.proofprofile.net/proofs/artist/41155c56-27a8-46ae-837e-e0a3e0bc4930.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).