Johnny Leeflang
type: MusicGroup
popularity: 15
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x3fa2dfbff1fe60f749f6adeaeaf54ce59cf90193742759ef3f051e12ee8639c7
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953657
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953657
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/4db286d7-68c8-420d-9385-8704416a8d62.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/4db286d7-68c8-420d-9385-8704416a8d62.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/4db286d7-68c8-420d-9385-8704416a8d62
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T16:43:25Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x3fa2dfbff1fe60f749f6adeaeaf54ce59cf90193742759ef3f051e12ee8639c7","name":"Johnny Leeflang","registered_at":"2026-06-14T12:40:16Z","symbol":"NIM0455832","token_address":"0x22380f07d5d1ffc52811c4fc95477a7d491c869c","type":"artist","uuid":"4db286d7-68c8-420d-9385-8704416a8d62"}
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 0x3fa2dfbff1fe60f749f6adeaeaf54ce59cf90193742759ef3f051e12ee8639c7. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4db286d7-68c8-420d-9385-8704416a8d62.json and https://artists.proofprofile.net/proofs/artist/4db286d7-68c8-420d-9385-8704416a8d62.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T16:43:25Z
  text: {"copyright_id":"0x3fa2dfbff1fe60f749f6adeaeaf54ce59cf90193742759ef3f051e12ee8639c7","name":"Johnny Leeflang","registered_at":"2026-06-14T12:40:16Z","symbol":"NIM0455832","token_address":"0x22380f07d5d1ffc52811c4fc95477a7d491c869c","type":"artist","uuid":"4db286d7-68c8-420d-9385-8704416a8d62"}
album: Geen Gangster Maar Straatwijs
  type: MusicAlbum
  date published: 2025-07-04
album: Kleine Jongen
  type: MusicAlbum
  date published: 2025-08-01