David Kempers
type: MusicGroup
popularity: 4
followers: 488
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xeda11bbe85d50171c00ff5722d673dc062abd9e5d5c52ffbca3c6da546b5f9d6
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954028
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954028
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/3a67bf78-a34c-4dbe-b43d-1fa2bf79346d.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/3a67bf78-a34c-4dbe-b43d-1fa2bf79346d.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/3a67bf78-a34c-4dbe-b43d-1fa2bf79346d
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T01:08:06Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xeda11bbe85d50171c00ff5722d673dc062abd9e5d5c52ffbca3c6da546b5f9d6","name":"David Kempers","registered_at":"2026-06-16T09:53:49Z","symbol":"NIM1015182","token_address":"0xbb147f3b170ac0389543550668e26707db0edf4c","type":"artist","uuid":"3a67bf78-a34c-4dbe-b43d-1fa2bf79346d"}
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 0xeda11bbe85d50171c00ff5722d673dc062abd9e5d5c52ffbca3c6da546b5f9d6. Chain 2 (Bitcoin): anchored in block 954028 (2026-06-17T01:08:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3a67bf78-a34c-4dbe-b43d-1fa2bf79346d.json and https://artists.proofprofile.net/proofs/artist/3a67bf78-a34c-4dbe-b43d-1fa2bf79346d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-17T01:08:06Z
  text: {"copyright_id":"0xeda11bbe85d50171c00ff5722d673dc062abd9e5d5c52ffbca3c6da546b5f9d6","name":"David Kempers","registered_at":"2026-06-16T09:53:49Z","symbol":"NIM1015182","token_address":"0xbb147f3b170ac0389543550668e26707db0edf4c","type":"artist","uuid":"3a67bf78-a34c-4dbe-b43d-1fa2bf79346d"}
album: Electronic Symphonica
  type: MusicAlbum
  date published: 2006-09-12
  track: Danse Macabre by Saint-Saens
    type: MusicRecording
    duration: PT7M21S
    duration ms: 441160
    explicit: false
    by artist: David Kempers
    in album: Electronic Symphonica
      type: MusicAlbum
      date published: 2006-09-12
    isrc code: US2Y80610009
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-17T03:25:49+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x0d6384c45fc25496ca5a9d3d583b58475b795a568a49df9d3e916693921599e3
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958357
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958357
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2Y80610009
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T03:33:42Z
    additional property: OTSVerifyInstructions
      type: PropertyValue
      value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x0d6384c45fc25496ca5a9d3d583b58475b795a568a49df9d3e916693921599e3. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2Y80610009 — a six-check JSON result.
      date published: 2026-07-17T03:33:42Z
    audio: Danse Macabre by Saint-Saens
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 66.656
      additional property: Musical Key
        type: PropertyValue
        value: 7
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.295
      additional property: Energy
        type: PropertyValue
        value: 0.301
      additional property: Speechiness
        type: PropertyValue
        value: 0.055
      additional property: Acousticness
        type: PropertyValue
        value: 0.904
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.852
      additional property: Liveness
        type: PropertyValue
        value: 0.086
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.185
      additional property: Loudness (dB)
        type: PropertyValue
        value: -15.357
      additional property: Key Name
        type: PropertyValue
        value: G
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Wander
  type: MusicAlbum
  date published: 2021-02-11