E.H.P. (Établissements Henry Precloux) was a French automobile manufacturer. History The Établissements Henry Precloux commenced building light cars in Courbevoie (Paris) in 1921. In 1926 they incorp
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 0x4415a009ba9355a97ed63b2fe8f0c10c2669f52a3ef19f9dd6e3ac43b31c2a55. 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/c4b332d7-8193-445b-a71b-e8336c181a0d.json and https://artists.proofprofile.net/proofs/artist/c4b332d7-8193-445b-a71b-e8336c181a0d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).