Stephen John Greif (; 26 August 1944 – 23 December 2022) was an English actor known for his roles as Travis in Blake's 7, Harry Fenning in three series of Citizen Smith, Signor Donato in Casanova and
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c095ee34e8c7cdc24161116b4bbeb0082306b24c457818b73d0fbec9a4e660. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5e1c22f2-aa40-4a77-9967-3c67df75e9c1.json and https://artists.proofprofile.net/proofs/artist/5e1c22f2-aa40-4a77-9967-3c67df75e9c1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).