Keiji Kawashima
type: MusicGroup
genre: kayokyoku
popularity: 7
followers: 478
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x10f4095e997c01756a68bebcc005e5a59ed9169866a3bc8e52fe09fb272adaca
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953895
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953895
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0e2e76f7-a54b-4fa4-8de9-ea725bae1cc0.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0e2e76f7-a54b-4fa4-8de9-ea725bae1cc0.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/0e2e76f7-a54b-4fa4-8de9-ea725bae1cc0
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T05:46:35Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x10f4095e997c01756a68bebcc005e5a59ed9169866a3bc8e52fe09fb272adaca","name":"Keiji Kawashima","registered_at":"2026-06-15T18:42:34Z","symbol":"NIM0797647","token_address":"0x5817682d479ad247792980a7bb80396777470fa9","type":"artist","uuid":"0e2e76f7-a54b-4fa4-8de9-ea725bae1cc0"}
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 0x10f4095e997c01756a68bebcc005e5a59ed9169866a3bc8e52fe09fb272adaca. Chain 2 (Bitcoin): anchored in block 953895 (2026-06-16T05:46:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e2e76f7-a54b-4fa4-8de9-ea725bae1cc0.json and https://artists.proofprofile.net/proofs/artist/0e2e76f7-a54b-4fa4-8de9-ea725bae1cc0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T05:46:35Z
  text: {"copyright_id":"0x10f4095e997c01756a68bebcc005e5a59ed9169866a3bc8e52fe09fb272adaca","name":"Keiji Kawashima","registered_at":"2026-06-15T18:42:34Z","symbol":"NIM0797647","token_address":"0x5817682d479ad247792980a7bb80396777470fa9","type":"artist","uuid":"0e2e76f7-a54b-4fa4-8de9-ea725bae1cc0"}
album: Woman"Wの悲劇"より
  type: MusicAlbum
  date published: 2016-07-27
album: KEIJI
  type: MusicAlbum
  date published: 2016-08-31
  track: 夏の終りのハーモニー
    type: MusicRecording
    duration: PT4M44S
    duration ms: 284666
    explicit: false
    by artist: Keiji Kawashima
    in album: KEIJI
      type: MusicAlbum
      date published: 2016-08-31
    genre: kayokyoku
    isrc code: JPPO01618542
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-06-29T23:55:00+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xfc3675186a6e45110416d3e2c390786f73d9c3fdca75325332e892921752f443
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956375
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956375
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPO01618542
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-02T16:51:38Z
    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 0xfc3675186a6e45110416d3e2c390786f73d9c3fdca75325332e892921752f443. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/JPPO01618542.
      date published: 2026-07-02T16:51:38Z
    audio: 夏の終りのハーモニー
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 151.947
      additional property: Musical Key
        type: PropertyValue
        value: 4
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.358
      additional property: Energy
        type: PropertyValue
        value: 0.536
      additional property: Speechiness
        type: PropertyValue
        value: 0.03
      additional property: Acousticness
        type: PropertyValue
        value: 0.09
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.067
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.245
      additional property: Loudness (dB)
        type: PropertyValue
        value: -4.845
      additional property: Key Name
        type: PropertyValue
        value: E
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: KEIJI
  type: MusicAlbum
  date published: 2016-08-31
album: NUMERO
  type: MusicAlbum
  date published: 2018-11-16
album: KEIJIHOLIC
  type: MusicAlbum
  date published: 2019-06-05
album: 今人
  type: MusicAlbum
  date published: 2022-05-26