Stephen Greif
type: MusicGroup
description: 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
popularity: 4
followers: 1
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xc9c095ee34e8c7cdc24161116b4bbeb0082306b24c457818b73d0fbec9a4e660
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954066
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954066
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/5e1c22f2-aa40-4a77-9967-3c67df75e9c1.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/5e1c22f2-aa40-4a77-9967-3c67df75e9c1.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/5e1c22f2-aa40-4a77-9967-3c67df75e9c1
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xc9c095ee34e8c7cdc24161116b4bbeb0082306b24c457818b73d0fbec9a4e660","name":"Stephen Greif","registered_at":"2026-06-16T22:28:48Z","symbol":"NIM1195307","token_address":"0x43a167bfd393bbde754d365c1a5a729e6a3373ac","type":"artist","uuid":"5e1c22f2-aa40-4a77-9967-3c67df75e9c1"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: 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).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0xc9c095ee34e8c7cdc24161116b4bbeb0082306b24c457818b73d0fbec9a4e660","name":"Stephen Greif","registered_at":"2026-06-16T22:28:48Z","symbol":"NIM1195307","token_address":"0x43a167bfd393bbde754d365c1a5a729e6a3373ac","type":"artist","uuid":"5e1c22f2-aa40-4a77-9967-3c67df75e9c1"}