Philippe Petit (; born 13 August 1949) is a French highwire artist who gained fame for his unauthorized highwire walks between the towers of Notre-Dame Cathedral in Paris in 1971 and of Sydney Harbour
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 0x90554f0b7be4d1da36b6aa15cbb1b922666703787583187b11b3990386e19843. Chain 2 (Bitcoin): anchored in block 954048 (2026-06-17T05:00:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4262b2f4-dd13-4a9c-84af-d3f9287ed3bb.json and https://artists.proofprofile.net/proofs/artist/4262b2f4-dd13-4a9c-84af-d3f9287ed3bb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).