Les Ambassadeurs or Ambassadeurs may refer to: Les Ambassadeurs (film), a 1977 French-Tunisian film Ambassadeurs, an 1892 lithograph poster by Henri de Toulouse-Lautrec Café des Ambassadeurs, a caf
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 0x54ca65d19c7166447c8d62878560ebb4f55a115f8c099c0393f1c4a2875dec0f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ca71881-ab4c-4701-9f33-b73f84ea5c14.json and https://artists.proofprofile.net/proofs/artist/5ca71881-ab4c-4701-9f33-b73f84ea5c14.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).