小久保直紀
type: MusicGroup
popularity: 5
followers: 90
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x6c1e4479b265c8f56a7b9921cfc4a864f91b4d246f7a9cbad2d2b590c86d5024
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953907
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953907
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/15fd0f7d-114e-47c1-8f57-0701ff9f2a0f.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/15fd0f7d-114e-47c1-8f57-0701ff9f2a0f.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/15fd0f7d-114e-47c1-8f57-0701ff9f2a0f
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T07:39:24Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x6c1e4479b265c8f56a7b9921cfc4a864f91b4d246f7a9cbad2d2b590c86d5024","name":"小久保直紀","registered_at":"2026-06-15T21:06:01Z","symbol":"NIM0831855","token_address":"0x21b61643faef157516e8f7710e100a70f16fa061","type":"artist","uuid":"15fd0f7d-114e-47c1-8f57-0701ff9f2a0f"}
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 0x6c1e4479b265c8f56a7b9921cfc4a864f91b4d246f7a9cbad2d2b590c86d5024. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/15fd0f7d-114e-47c1-8f57-0701ff9f2a0f.json and https://artists.proofprofile.net/proofs/artist/15fd0f7d-114e-47c1-8f57-0701ff9f2a0f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T07:39:24Z
  text: {"copyright_id":"0x6c1e4479b265c8f56a7b9921cfc4a864f91b4d246f7a9cbad2d2b590c86d5024","name":"小久保直紀","registered_at":"2026-06-15T21:06:01Z","symbol":"NIM0831855","token_address":"0x21b61643faef157516e8f7710e100a70f16fa061","type":"artist","uuid":"15fd0f7d-114e-47c1-8f57-0701ff9f2a0f"}
album: Spark
  type: MusicAlbum
  date published: 2020-09-12
  track: Spark
    type: MusicRecording
    duration: PT2M18S
    duration ms: 138285
    explicit: false
    by artist: 小久保直紀
    in album: Spark
      type: MusicAlbum
      date published: 2020-09-12
    isrc code: TCJPM2043135
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-15T12:24:17+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x70510233b3691eb08489584d5f752661226b4d6ea7e356d94f76d6fdb8e6cf05
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958157
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958157
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPM2043135
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-15T15:24:52Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70510233b3691eb08489584d5f752661226b4d6ea7e356d94f76d6fdb8e6cf05. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:24:52Z), 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/TCJPM2043135.
      date published: 2026-07-15T15:24:52Z
    audio: Spark
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 104.987
      additional property: Musical Key
        type: PropertyValue
        value: 3
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.785
      additional property: Energy
        type: PropertyValue
        value: 0.423
      additional property: Speechiness
        type: PropertyValue
        value: 0.05
      additional property: Acousticness
        type: PropertyValue
        value: 0.178
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.057
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.72
      additional property: Loudness (dB)
        type: PropertyValue
        value: -11.771
      additional property: Key Name
        type: PropertyValue
        value: Eb
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Jamboree
  type: MusicAlbum
  date published: 2022-07-23