thumb|right|Cash card-operated Speed Queen commercial washers and dryers|194x194px thumb|187x187px|Speed Queen washers and dryers in a store display Speed Queen is an American laundry machine manufact
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 0x5a98eee9d001fa17e9f45ec1f7647dba8211ad123a01b3d5546bdf95c69a928a. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9da0c0ab-e337-4b05-9eb0-d210fd11c0a7.json and https://artists.proofprofile.net/proofs/artist/9da0c0ab-e337-4b05-9eb0-d210fd11c0a7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).