Catherine Dubosc (born 12 March 1959) is a French soprano. Born in Lille, she studied with Eric Tappy at the Opéra National de Lyon, before joining that company in 1985. She is well known for her Moza
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 0x283efb2324939d941f071a129ae44f774fcb26ed6a89464676ba1e5e4b347628. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fd934c8c-b1d3-4d95-a315-c3226d6e1740.json and https://artists.proofprofile.net/proofs/artist/fd934c8c-b1d3-4d95-a315-c3226d6e1740.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.