John F. Klaver
type: MusicGroup
genre: blues
genre: blues rock
genre: modern blues
popularity: 3
followers: 324
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xb32b17a46b075e16e77542d58687f59a729b8061a3a31a6d876de46e6302f87d
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954342
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954342
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/88be7669-212b-4db2-b51a-18d9d918f32b.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/88be7669-212b-4db2-b51a-18d9d918f32b.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/88be7669-212b-4db2-b51a-18d9d918f32b
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:22:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xb32b17a46b075e16e77542d58687f59a729b8061a3a31a6d876de46e6302f87d","name":"John F. Klaver","registered_at":"2026-06-17T13:21:38Z","symbol":"NIM1408181","token_address":"0xe19b246637bf43dfd403a54bcd0a0568d723c437","type":"artist","uuid":"88be7669-212b-4db2-b51a-18d9d918f32b"}
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 0xb32b17a46b075e16e77542d58687f59a729b8061a3a31a6d876de46e6302f87d. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/88be7669-212b-4db2-b51a-18d9d918f32b.json and https://artists.proofprofile.net/proofs/artist/88be7669-212b-4db2-b51a-18d9d918f32b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
  text: {"copyright_id":"0xb32b17a46b075e16e77542d58687f59a729b8061a3a31a6d876de46e6302f87d","name":"John F. Klaver","registered_at":"2026-06-17T13:21:38Z","symbol":"NIM1408181","token_address":"0xe19b246637bf43dfd403a54bcd0a0568d723c437","type":"artist","uuid":"88be7669-212b-4db2-b51a-18d9d918f32b"}
album: Coming Back for More
  type: MusicAlbum
  date published: 2011-01-22
album: Wheels in Motion
  type: MusicAlbum
  date published: 2012-06-22
album: The Edge
  type: MusicAlbum
  date published: 2014-10-22
album: Live at Blues Baltica
  type: MusicAlbum
  date published: 2016-06-01
album: Catch the Morning Sun
  type: MusicAlbum
  date published: 2017-10-24
album: Organic & Sustainable Sessions Vol.1
  type: MusicAlbum
  date published: 2019-11-29
album: Organic & Sustainable Sessions Vol.02
  type: MusicAlbum
  date published: 2023-10-20