John Verkroost
type: MusicGroup
popularity: 3
followers: 103
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x8d3e80f8137807ac590d55f839284608ec21b1ccbfe0dca5c011636da952d451
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/789cc09f-2986-4973-9e9f-09d6c9cd6c35.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/789cc09f-2986-4973-9e9f-09d6c9cd6c35.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/789cc09f-2986-4973-9e9f-09d6c9cd6c35
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x8d3e80f8137807ac590d55f839284608ec21b1ccbfe0dca5c011636da952d451","name":"John Verkroost","registered_at":"2026-06-17T07:41:38Z","symbol":"NIM1327189","token_address":"0x174488137062e62551dac9c9f170fa0c260ff8b4","type":"artist","uuid":"789cc09f-2986-4973-9e9f-09d6c9cd6c35"}
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 0x8d3e80f8137807ac590d55f839284608ec21b1ccbfe0dca5c011636da952d451. 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/789cc09f-2986-4973-9e9f-09d6c9cd6c35.json and https://artists.proofprofile.net/proofs/artist/789cc09f-2986-4973-9e9f-09d6c9cd6c35.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x8d3e80f8137807ac590d55f839284608ec21b1ccbfe0dca5c011636da952d451","name":"John Verkroost","registered_at":"2026-06-17T07:41:38Z","symbol":"NIM1327189","token_address":"0x174488137062e62551dac9c9f170fa0c260ff8b4","type":"artist","uuid":"789cc09f-2986-4973-9e9f-09d6c9cd6c35"}
album: Hammond Op Klompen
  type: MusicAlbum
  date published: 2013-08-21
album: Happy Christmas on Hammond
  type: MusicAlbum
  date published: 2013-11-25
album: Dutch Hammond Organ Potpourri
  type: MusicAlbum
  date published: 2021-11-01
album: Dutch Hammond Organ Potpourri
  type: MusicAlbum
  date published: 2021-11-05