かかこ
type: MusicGroup
genre: vocaloid
popularity: 5
followers: 99
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2f30ffb32d202cc3f6c40214ea15680c2e797f60ab149c061b05f82f9ee6c12d
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954638
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954638
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d4cd1235-fef2-458e-a2d5-5cabad50e6d5.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d4cd1235-fef2-458e-a2d5-5cabad50e6d5.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d4cd1235-fef2-458e-a2d5-5cabad50e6d5
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T03:45:44Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x2f30ffb32d202cc3f6c40214ea15680c2e797f60ab149c061b05f82f9ee6c12d","name":"かかこ","registered_at":"2026-06-21T02:24:16Z","symbol":"NIM1789872","token_address":"0x06071f1ce60848cac66ac8e692cc3a5eea3cf788","type":"artist","uuid":"d4cd1235-fef2-458e-a2d5-5cabad50e6d5"}
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 0x2f30ffb32d202cc3f6c40214ea15680c2e797f60ab149c061b05f82f9ee6c12d. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4cd1235-fef2-458e-a2d5-5cabad50e6d5.json and https://artists.proofprofile.net/proofs/artist/d4cd1235-fef2-458e-a2d5-5cabad50e6d5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T03:45:44Z
  text: {"copyright_id":"0x2f30ffb32d202cc3f6c40214ea15680c2e797f60ab149c061b05f82f9ee6c12d","name":"かかこ","registered_at":"2026-06-21T02:24:16Z","symbol":"NIM1789872","token_address":"0x06071f1ce60848cac66ac8e692cc3a5eea3cf788","type":"artist","uuid":"d4cd1235-fef2-458e-a2d5-5cabad50e6d5"}
album: バック・グラウンド・メモリー
  type: MusicAlbum
  date published: 2023-08-05
album: Back Ground Memory
  type: MusicAlbum
  date published: 2023-08-05
album: Q-SIDE
  type: MusicAlbum
  date published: 2025-02-23
album: Q-SIDE
  type: MusicAlbum
  date published: 2025-02-23
  track: Q-SIDE
    type: MusicRecording
    duration: PT3M0S
    duration ms: 180446
    explicit: false
    by artist: かかこ
    in album: Q-SIDE
      type: MusicAlbum
      date published: 2025-02-23
    genre: vocaloid
    isrc code: JP92U2500086
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-04T12:56:28+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x7e277756b130e746d13392b371d8b87d6110344afacf53555ca72075bb9594eb
    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/JP92U2500086
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e277756b130e746d13392b371d8b87d6110344afacf53555ca72075bb9594eb. 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/JP92U2500086.
      date published: 2026-07-05T01:12:41Z
    audio: Q-SIDE
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 164.968
      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: 0.613
      additional property: Energy
        type: PropertyValue
        value: 0.816
      additional property: Speechiness
        type: PropertyValue
        value: 0.047
      additional property: Acousticness
        type: PropertyValue
        value: 0.158
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.348
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.708
      additional property: Loudness (dB)
        type: PropertyValue
        value: -9.259
      additional property: Key Name
        type: PropertyValue
        value: Ab
      additional property: Mode Name
        type: PropertyValue
        value: Minor