れいか
type: MusicGroup
genre: enka
genre: kayokyoku
popularity: 4
followers: 194
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0f152a000826764e50f00592766d5bc827fa42608ccb6754184f8f8aa24c2c01
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954342
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954342
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/82396ac2-d494-4cb9-a407-18c15f46ad70.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/82396ac2-d494-4cb9-a407-18c15f46ad70.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/82396ac2-d494-4cb9-a407-18c15f46ad70
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:22:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x0f152a000826764e50f00592766d5bc827fa42608ccb6754184f8f8aa24c2c01","name":"れいか","registered_at":"2026-06-17T11:03:25Z","symbol":"NIM1375300","token_address":"0x09dc5a20b0eede4b445f3c6d4ce9073403caeec2","type":"artist","uuid":"82396ac2-d494-4cb9-a407-18c15f46ad70"}
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 0x0f152a000826764e50f00592766d5bc827fa42608ccb6754184f8f8aa24c2c01. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/82396ac2-d494-4cb9-a407-18c15f46ad70.json and https://artists.proofprofile.net/proofs/artist/82396ac2-d494-4cb9-a407-18c15f46ad70.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
  text: {"copyright_id":"0x0f152a000826764e50f00592766d5bc827fa42608ccb6754184f8f8aa24c2c01","name":"れいか","registered_at":"2026-06-17T11:03:25Z","symbol":"NIM1375300","token_address":"0x09dc5a20b0eede4b445f3c6d4ce9073403caeec2","type":"artist","uuid":"82396ac2-d494-4cb9-a407-18c15f46ad70"}
album: 貯金の好きな女／紅い月のアモーレ
  type: MusicAlbum
  date published: 2020-12-02
album: OSAKAレイニーブルース／東京ボレロ
  type: MusicAlbum
  date published: 2023-01-25
album: とわず語りの数え唄／硝子のシャボン玉
  type: MusicAlbum
  date published: 2025-04-02
  track: とわず語りの数え唄
    type: MusicRecording
    duration: PT4M50S
    duration ms: 290320
    explicit: false
    by artist: れいか
    in album: とわず語りの数え唄／硝子のシャボン玉
      type: MusicAlbum
      date published: 2025-04-02
    genre: enka
    genre: kayokyoku
    isrc code: JPCR02500220
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-04T20:05:52+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xffb9b1518cc6ce183ba41a1abfe29eef00f1d22c387076ef815851e803c3eafa
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956725
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956725
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCR02500220
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-05T01:12:41Z
    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 0xffb9b1518cc6ce183ba41a1abfe29eef00f1d22c387076ef815851e803c3eafa. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPCR02500220.
      date published: 2026-07-05T01:12:41Z
    audio: とわず語りの数え唄
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 205.843
      additional property: Musical Key
        type: PropertyValue
        value: 8
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.398
      additional property: Energy
        type: PropertyValue
        value: 0.803
      additional property: Speechiness
        type: PropertyValue
        value: 0.046
      additional property: Acousticness
        type: PropertyValue
        value: 0.128
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.011
      additional property: Liveness
        type: PropertyValue
        value: 0.276
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.826
      additional property: Loudness (dB)
        type: PropertyValue
        value: -1.349
      additional property: Key Name
        type: PropertyValue
        value: Ab
      additional property: Mode Name
        type: PropertyValue
        value: Minor