thumb|right|A patu paraoa at the British Museum. thumb|right|Mete Kīngi Paetahi, circa 1869 by unknown photographer. A patu is a club or pounder used by the Māori. The word in the Māori language mea
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 0xca8b65bbb02c305dd3db2330b4abeb1c69075c04a18e13117a2deb640bd0249d. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bbf62a16-b2e3-485f-9d2a-f6e7c397770d.json and https://artists.proofprofile.net/proofs/artist/bbf62a16-b2e3-485f-9d2a-f6e7c397770d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).