Jeff Chapman
type: MusicGroup
genre: blues rock
description: Jeff(rey) or Geoff(rey) Chapman may refer to: Jeff Chapman a.k.a. Ninjalicious (1973–2005), Canadian urban explorer and fountaineer Jeff Chapman (politician) (born 1959), American state senator Jeff
popularity: 2
followers: 83
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xdf348c3b1be74727f1588b5f22eb293c3f7b37d9ff02717d9dce6fa1ae257175
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954553
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954553
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/ace19129-758b-4fc7-838f-7daed182e31f.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/ace19129-758b-4fc7-838f-7daed182e31f.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/ace19129-758b-4fc7-838f-7daed182e31f
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T11:51:30Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xdf348c3b1be74727f1588b5f22eb293c3f7b37d9ff02717d9dce6fa1ae257175","name":"Jeff Chapman","registered_at":"2026-06-20T09:58:24Z","symbol":"NIM1586598","token_address":"0x3d1c3a0e29e6b51a11a59feb56c2d557ba29d7b2","type":"artist","uuid":"ace19129-758b-4fc7-838f-7daed182e31f"}
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 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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf348c3b1be74727f1588b5f22eb293c3f7b37d9ff02717d9dce6fa1ae257175. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ace19129-758b-4fc7-838f-7daed182e31f.json and https://artists.proofprofile.net/proofs/artist/ace19129-758b-4fc7-838f-7daed182e31f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T11:51:30Z
  text: {"copyright_id":"0xdf348c3b1be74727f1588b5f22eb293c3f7b37d9ff02717d9dce6fa1ae257175","name":"Jeff Chapman","registered_at":"2026-06-20T09:58:24Z","symbol":"NIM1586598","token_address":"0x3d1c3a0e29e6b51a11a59feb56c2d557ba29d7b2","type":"artist","uuid":"ace19129-758b-4fc7-838f-7daed182e31f"}
album: Big Jeff's Blues, Vol. 1
  type: MusicAlbum
  date published: 2009-02-22
album: Big Jeff's Blues, Vol. 2
  type: MusicAlbum
  date published: 2010-10-01
album: Watchin' the World Go By
  type: MusicAlbum
  date published: 2017-02-14
album: Train Left the Station
  type: MusicAlbum
  date published: 2018-08-27