Roscoe James Irwin (born 21 February 1983) is an Australian trumpet player, arranger, composer, multi-instrumentalist and producer. He is most known for his work as one of the trumpet players and the
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 0x42e09dea64221f00a57f5d6f7f357a0074bf5590e75eca60e8c3180c7818c754. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b8f8fcca-d0e6-4085-bce8-9cfdc3a95d37.json and https://artists.proofprofile.net/proofs/artist/b8f8fcca-d0e6-4085-bce8-9cfdc3a95d37.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.