古閑正美
type: MusicGroup
genre: enka
genre: kayokyoku
popularity: 4
followers: 5
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x304b41df2c12da751c354adc3cafc159fe7d705082fc3e545ddf1561d7e2cb76
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954784
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954784
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f2cd8778-9881-48e0-a8f2-dbff30e36f96.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f2cd8778-9881-48e0-a8f2-dbff30e36f96.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/f2cd8778-9881-48e0-a8f2-dbff30e36f96
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-22T02:53:59Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x304b41df2c12da751c354adc3cafc159fe7d705082fc3e545ddf1561d7e2cb76","name":"古閑正美","registered_at":"2026-06-21T14:04:26Z","symbol":"NIM1940732","token_address":"0x75a9d48b730c86ae7ee7d8dce488fc9736997a3d","type":"artist","uuid":"f2cd8778-9881-48e0-a8f2-dbff30e36f96"}
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 0x304b41df2c12da751c354adc3cafc159fe7d705082fc3e545ddf1561d7e2cb76. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2cd8778-9881-48e0-a8f2-dbff30e36f96.json and https://artists.proofprofile.net/proofs/artist/f2cd8778-9881-48e0-a8f2-dbff30e36f96.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-22T02:53:59Z
  text: {"copyright_id":"0x304b41df2c12da751c354adc3cafc159fe7d705082fc3e545ddf1561d7e2cb76","name":"古閑正美","registered_at":"2026-06-21T14:04:26Z","symbol":"NIM1940732","token_address":"0x75a9d48b730c86ae7ee7d8dce488fc9736997a3d","type":"artist","uuid":"f2cd8778-9881-48e0-a8f2-dbff30e36f96"}
album: 月夜のメモリー
  type: MusicAlbum
  date published: 2025-06-18
  track: 月夜のメモリー
    type: MusicRecording
    duration: PT3M43S
    duration ms: 223146
    explicit: false
    by artist: 古閑正美
    in album: 月夜のメモリー
      type: MusicAlbum
      date published: 2025-06-18
    genre: enka
    genre: kayokyoku
    isrc code: JPTE02501870
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-16T12:49:17+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x2281bfa62d817e098db80298b3a8e89cdb56dcdd562bdaedcb762a86403e3558
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958300
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958300
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPTE02501870
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-16T16:14:30Z
    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 0x2281bfa62d817e098db80298b3a8e89cdb56dcdd562bdaedcb762a86403e3558. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/JPTE02501870 — a six-check JSON result.
      date published: 2026-07-16T16:14:30Z
    audio: 月夜のメモリー
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 142.882
      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: 0.535
      additional property: Energy
        type: PropertyValue
        value: 0.778
      additional property: Speechiness
        type: PropertyValue
        value: 0.05
      additional property: Acousticness
        type: PropertyValue
        value: 0.495
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.271
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.866
      additional property: Loudness (dB)
        type: PropertyValue
        value: -4.599
      additional property: Key Name
        type: PropertyValue
        value: B
      additional property: Mode Name
        type: PropertyValue
        value: Minor