Hubert Rostaing (17 September 1918 – 10 June 1990) was a jazz clarinetist and tenor saxophonist. He also did film composition and classical music. He began his career in Algiers with the "Red Hotters
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 0x0ff5212e95e57c6e10e9dad3416ec48db6d764e663afe735d1d9086b093abff0. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2e49b44-fb5f-4351-a4bd-39929d1817eb.json and https://artists.proofprofile.net/proofs/artist/f2e49b44-fb5f-4351-a4bd-39929d1817eb.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.