Rod Mason (28 September 1940 – 8 January 2017) was an English musician (trumpet, cornet, vocals) who played trad jazz. Biography Mason was born in Plymouth, England. As a young man he played with 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 0x863dd6b28102dddcf240b08ce94850f3568912eeef11fa4fc73816b8eca29f67. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aaa3c807-b7b5-4e70-bd65-2b524cc179c2.json and https://artists.proofprofile.net/proofs/artist/aaa3c807-b7b5-4e70-bd65-2b524cc179c2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).