久海菜々美(CV:山下七海)
type: MusicGroup
popularity: 5
followers: 1656
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7e2f91678aee6f502ed58ced8cc1e2380528e89fd4a00f99a1cdde0be4de903d
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953978
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953978
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/2c021da0-8c93-4b99-b05b-c293234179f4.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/2c021da0-8c93-4b99-b05b-c293234179f4.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/2c021da0-8c93-4b99-b05b-c293234179f4
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T17:11:18Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x7e2f91678aee6f502ed58ced8cc1e2380528e89fd4a00f99a1cdde0be4de903d","name":"久海菜々美(CV:山下七海)","registered_at":"2026-06-16T04:56:36Z","symbol":"NIM0944208","token_address":"0xfc2e95fd79b0a255933449d490f26116c5500dca","type":"artist","uuid":"2c021da0-8c93-4b99-b05b-c293234179f4"}
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 0x7e2f91678aee6f502ed58ced8cc1e2380528e89fd4a00f99a1cdde0be4de903d. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c021da0-8c93-4b99-b05b-c293234179f4.json and https://artists.proofprofile.net/proofs/artist/2c021da0-8c93-4b99-b05b-c293234179f4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T22:46:20Z
  text: {"copyright_id":"0x7e2f91678aee6f502ed58ced8cc1e2380528e89fd4a00f99a1cdde0be4de903d","name":"久海菜々美(CV:山下七海)","registered_at":"2026-06-16T04:56:36Z","symbol":"NIM0944208","token_address":"0xfc2e95fd79b0a255933449d490f26116c5500dca","type":"artist","uuid":"2c021da0-8c93-4b99-b05b-c293234179f4"}
album: Wake Up,Girls!Character song series 久海菜々美
  type: MusicAlbum
  date published: 2014-11-05
  track: オオカミとピアノ
    type: MusicRecording
    duration: PT4M42S
    duration ms: 282373
    explicit: false
    by artist: 久海菜々美(CV:山下七海)
    in album: Wake Up,Girls!Character song series 久海菜々美
      type: MusicAlbum
      date published: 2014-11-05
    isrc code: JPB601403813
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-20T03:08:00+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xa0fe5b8a415a21d2d21241f8908ed519685ce4f22bb7fd815bde7f030a471ff5
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958823
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958823
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPB601403813
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T04:29:18Z
    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 0xa0fe5b8a415a21d2d21241f8908ed519685ce4f22bb7fd815bde7f030a471ff5. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/JPB601403813.
      date published: 2026-07-20T04:29:18Z
    audio: オオカミとピアノ
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 131.371
      additional property: Musical Key
        type: PropertyValue
        value: 9
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.439
      additional property: Energy
        type: PropertyValue
        value: 0.972
      additional property: Speechiness
        type: PropertyValue
        value: 0.053
      additional property: Acousticness
        type: PropertyValue
        value: 0.141
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.001
      additional property: Liveness
        type: PropertyValue
        value: 0.121
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.878
      additional property: Loudness (dB)
        type: PropertyValue
        value: -3.142
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Wake Up, Girls! (Character song series2 久海菜々美)
  type: MusicAlbum
  date published: 2016-09-28
album: Wake Up, Girls!Character song series3 久海菜々美
  type: MusicAlbum
  date published: 2017-12-20