Joseph Angelo Grech (10 December 1948 – 28 December 2010"Sandhurst bishop dies", The Age, 29 December 2010"Most Reverend Joseph Angelo Grech DD", Diocese of Sandhurst death notice, The Herald Sun, 29
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 0xdabe766fcb563de6b8b1043efa40eaea58c37d3479f4fbad2707e0126fcf5e7c. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e0f263c4-b7a0-456c-94c7-6ba4b4d914fa.json and https://artists.proofprofile.net/proofs/artist/e0f263c4-b7a0-456c-94c7-6ba4b4d914fa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).