Hedva & David
type: MusicGroup
genre: enka
genre: kayokyoku
popularity: 11
followers: 339
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x65123a1a408df1c266c1195882357b37470a8ea08567a7175d30da9c76888fc2
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953807
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953807
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f1bcfb83-6199-4c0f-9817-c256b16d3516.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f1bcfb83-6199-4c0f-9817-c256b16d3516.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/f1bcfb83-6199-4c0f-9817-c256b16d3516
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T16:39:18Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x65123a1a408df1c266c1195882357b37470a8ea08567a7175d30da9c76888fc2","name":"Hedva & David","registered_at":"2026-06-15T05:55:06Z","symbol":"NIM0702791","token_address":"0xe4761513bbd6e43e26d14f774e3c36b99cde37dd","type":"artist","uuid":"f1bcfb83-6199-4c0f-9817-c256b16d3516"}
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 0x65123a1a408df1c266c1195882357b37470a8ea08567a7175d30da9c76888fc2. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1bcfb83-6199-4c0f-9817-c256b16d3516.json and https://artists.proofprofile.net/proofs/artist/f1bcfb83-6199-4c0f-9817-c256b16d3516.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T16:39:18Z
  text: {"copyright_id":"0x65123a1a408df1c266c1195882357b37470a8ea08567a7175d30da9c76888fc2","name":"Hedva & David","registered_at":"2026-06-15T05:55:06Z","symbol":"NIM0702791","token_address":"0xe4761513bbd6e43e26d14f774e3c36b99cde37dd","type":"artist","uuid":"f1bcfb83-6199-4c0f-9817-c256b16d3516"}
album: ナオミの夢
  type: MusicAlbum
  date published: 1971-01-25
album: ナオミの夢
  type: MusicAlbum
  date published: 1971-01-25
  track: ナオミの夢 - 日本語Ver
    type: MusicRecording
    duration: PT2M54S
    duration ms: 174026
    explicit: false
    by artist: Hedva & David
    in album: ナオミの夢
      type: MusicAlbum
      date published: 1971-01-25
    genre: enka
    genre: kayokyoku
    isrc code: JPBV09501900
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-15T07:03:06+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x41fd6aed88584e01bcdb4163ed113506ee50c10cbaf2516cad2612b23fc9086e
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958115
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958115
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPBV09501900
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-15T10:02:55Z
    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 0x41fd6aed88584e01bcdb4163ed113506ee50c10cbaf2516cad2612b23fc9086e. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T10:02:55Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPBV09501900.
      date published: 2026-07-15T10:02:55Z
    audio: ナオミの夢 - 日本語Ver
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 150.862
      additional property: Musical Key
        type: PropertyValue
        value: 11
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.444
      additional property: Energy
        type: PropertyValue
        value: 0.726
      additional property: Speechiness
        type: PropertyValue
        value: 0.046
      additional property: Acousticness
        type: PropertyValue
        value: 0.333
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.077
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.839
      additional property: Loudness (dB)
        type: PropertyValue
        value: -10.122
      additional property: Key Name
        type: PropertyValue
        value: B
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: ナオミの夢
  type: MusicAlbum
  date published: 2020-05-29
album: グレイテスト・ヒッツ
  type: MusicAlbum
  date published: 2024-03-08