Mignon () is an 1866 opéra comique (or opera in its second version) in three acts by Ambroise Thomas. The original French libretto was by Jules Barbier and Michel Carré, based on Goethe's 1795-96 nove
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 0xed42c04eea6fcbbfb084215c0d64da9899725ec8b9bb1dc13c2b49b32b8e41db. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe31551c-84dc-4a63-8966-15c55233289f.json and https://artists.proofprofile.net/proofs/artist/fe31551c-84dc-4a63-8966-15c55233289f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).