The Rebour was a French automobile manufactured by Puteaux from 1905 until 1908. The Puteaux company built "luxury touring cars" and cabs; its model range consisted of 10/12 hp, 18/22 hp, 20/25 hp, an
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 0x95e90e1920e3abf89efdebbd0e9f71c5b9810f4c2e1ff6e7a560124e5d828c8e. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/50b959bb-c0cf-469f-9a6b-f1a1b6929c0e.json and https://artists.proofprofile.net/proofs/artist/50b959bb-c0cf-469f-9a6b-f1a1b6929c0e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).