Eruka
type: MusicGroup
genre: vocaloid
popularity: 4
followers: 50
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xaa8ad53262014ffa3471dd98787bda9755788722b3f05374a68b70ca2acc35ff
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954705
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954705
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/eb82f759-27a3-48fa-bfbf-2430bb5209de.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/eb82f759-27a3-48fa-bfbf-2430bb5209de.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/eb82f759-27a3-48fa-bfbf-2430bb5209de
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T13:42:37Z
additional property: OTSCanonicalRecord
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 0xaa8ad53262014ffa3471dd98787bda9755788722b3f05374a68b70ca2acc35ff. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb82f759-27a3-48fa-bfbf-2430bb5209de.json and https://artists.proofprofile.net/proofs/artist/eb82f759-27a3-48fa-bfbf-2430bb5209de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T13:42:37Z
album: Escape Key
  type: MusicAlbum
  date published: 2023-10-18
album: Nobody knows under the umbrella
  type: MusicAlbum
  date published: 2023-10-18
album: まいあいでぃーる！！
  type: MusicAlbum
  date published: 2023-10-18
album: My ideal!!
  type: MusicAlbum
  date published: 2023-10-18
album: God, save us
  type: MusicAlbum
  date published: 2023-10-18
album: エスケープキー
  type: MusicAlbum
  date published: 2023-10-18
album: Rent free
  type: MusicAlbum
  date published: 2023-10-18
album: PleochroicSky
  type: MusicAlbum
  date published: 2023-10-18
album: 神様救え僕たちを
  type: MusicAlbum
  date published: 2023-10-18
album: Untrace
  type: MusicAlbum
  date published: 2023-10-18
album: Dream is stuck in my head (feat. HATSUNE MIKU & KAGAMINE RIN)
  type: MusicAlbum
  date published: 2024-10-03
album: Uncalled (feat. KASANE TETO & HATSUNE MIKU)
  type: MusicAlbum
  date published: 2024-10-03
  track: Uncalled (feat. KASANE TETO & HATSUNE MIKU)
    type: MusicRecording
    duration: PT2M13S
    duration ms: 133989
    explicit: false
    by artist: Eruka
    in album: Uncalled (feat. KASANE TETO & HATSUNE MIKU)
      type: MusicAlbum
      date published: 2024-10-03
    genre: vocaloid
    isrc code: TCJPC2407836
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-16T17:04:36+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xea87b8e9219ed996202add55f8967ab2f9792b799206ad5edd39c621e4b70526
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958319
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958319
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPC2407836
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T02:01:40Z
    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 0xea87b8e9219ed996202add55f8967ab2f9792b799206ad5edd39c621e4b70526. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-17T02:01:40Z), 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/TCJPC2407836.
      date published: 2026-07-17T02:01:40Z
    audio: Uncalled (feat. KASANE TETO & HATSUNE MIKU)
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 100.088
      additional property: Musical Key
        type: PropertyValue
        value: 4
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.724
      additional property: Energy
        type: PropertyValue
        value: 0.846
      additional property: Speechiness
        type: PropertyValue
        value: 0.078
      additional property: Acousticness
        type: PropertyValue
        value: 0.181
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.281
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.588
      additional property: Loudness (dB)
        type: PropertyValue
        value: -5.351
      additional property: Key Name
        type: PropertyValue
        value: E
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: アンコールド (feat. 重音テト & 初音ミク)
  type: MusicAlbum
  date published: 2024-10-03
album: Placing a Bookmark on a Rainy Night (feat. Una Otomachi)
  type: MusicAlbum
  date published: 2024-12-26
album: ♡アグレッション (feat. 歌愛ユキ & 音街ウナ)
  type: MusicAlbum
  date published: 2025-05-15
album: heartaggression (feat. Kaai Yuki & Una Otomachi)
  type: MusicAlbum
  date published: 2025-05-15
album: All your fault (feat. HATSUNE MIKU)
  type: MusicAlbum
  date published: 2025-06-26
album: お前のせいだ (feat. 初音ミク)
  type: MusicAlbum
  date published: 2025-06-26