thumb|right|Two views of Jemmy Button from FitzRoy's Narrative (1839) thumb|right|A Yagan family inside a canoe Orundellico, known as "Jeremy Button" or "Jemmy Button" or "Jimmy Button" (c. 1815–1864)
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 0x73a70c90930e82a1bac8dcf26e82f2fccfb27425c860b26d0f6e51b46015636e. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e1e4e460-c31c-4fc5-854c-11a20008f516.json and https://artists.proofprofile.net/proofs/artist/e1e4e460-c31c-4fc5-854c-11a20008f516.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).