John Crew
type: MusicGroup
description: thumb|Triple Portrait of Crewe's wife, Mary Done, by William Dobson, painted 1635-38 John Crewe or Crew (1603 – 12 May 1670) was an English barrister and politician who sat in the House of Commons in
popularity: 2
followers: 1
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x954aac9e41e3f1c8dd4fc726f8966c57e0bf4b121b3698a0bf97a0caee2626f3
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/76529c6f-3ee5-40a4-8bf5-9496b1f971a9.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/76529c6f-3ee5-40a4-8bf5-9496b1f971a9.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/76529c6f-3ee5-40a4-8bf5-9496b1f971a9
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x954aac9e41e3f1c8dd4fc726f8966c57e0bf4b121b3698a0bf97a0caee2626f3","name":"John Crew","registered_at":"2026-06-17T06:50:03Z","symbol":"NIM1314924","token_address":"0x595d2f23cd25ffa67238fec6dcf3a9fd16f3619d","type":"artist","uuid":"76529c6f-3ee5-40a4-8bf5-9496b1f971a9"}
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 0x954aac9e41e3f1c8dd4fc726f8966c57e0bf4b121b3698a0bf97a0caee2626f3. 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/76529c6f-3ee5-40a4-8bf5-9496b1f971a9.json and https://artists.proofprofile.net/proofs/artist/76529c6f-3ee5-40a4-8bf5-9496b1f971a9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x954aac9e41e3f1c8dd4fc726f8966c57e0bf4b121b3698a0bf97a0caee2626f3","name":"John Crew","registered_at":"2026-06-17T06:50:03Z","symbol":"NIM1314924","token_address":"0x595d2f23cd25ffa67238fec6dcf3a9fd16f3619d","type":"artist","uuid":"76529c6f-3ee5-40a4-8bf5-9496b1f971a9"}