Hatsumi Kagaya
type: MusicGroup
popularity: 3
followers: 187
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf0ab38ce9f927a621cc69a00e22f158ece5ebf2533e10584aa46bddc8b1d6473
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953864
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953864
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/04396dac-1e7b-4e95-98bd-0c95d66628d5.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/04396dac-1e7b-4e95-98bd-0c95d66628d5.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/04396dac-1e7b-4e95-98bd-0c95d66628d5
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T00:30:31Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xf0ab38ce9f927a621cc69a00e22f158ece5ebf2533e10584aa46bddc8b1d6473","name":"Hatsumi Kagaya","registered_at":"2026-06-15T15:05:59Z","symbol":"NIM0745955","token_address":"0x9571bef9185d93afdb7d16bd36a14413cabac162","type":"artist","uuid":"04396dac-1e7b-4e95-98bd-0c95d66628d5"}
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 0xf0ab38ce9f927a621cc69a00e22f158ece5ebf2533e10584aa46bddc8b1d6473. Chain 2 (Bitcoin): anchored in block 953864 (2026-06-16T00:30:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/04396dac-1e7b-4e95-98bd-0c95d66628d5.json and https://artists.proofprofile.net/proofs/artist/04396dac-1e7b-4e95-98bd-0c95d66628d5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T00:30:31Z
  text: {"copyright_id":"0xf0ab38ce9f927a621cc69a00e22f158ece5ebf2533e10584aa46bddc8b1d6473","name":"Hatsumi Kagaya","registered_at":"2026-06-15T15:05:59Z","symbol":"NIM0745955","token_address":"0x9571bef9185d93afdb7d16bd36a14413cabac162","type":"artist","uuid":"04396dac-1e7b-4e95-98bd-0c95d66628d5"}
album: 君がいる
  type: MusicAlbum
  date published: 2011-08-31
album: 本日のスープ
  type: MusicAlbum
  date published: 2012-11-21
album: シンガーソングハイカー
  type: MusicAlbum
  date published: 2013-10-16
  track: 君がいる
    type: MusicRecording
    duration: PT4M20S
    duration ms: 260293
    explicit: false
    by artist: Hatsumi Kagaya
    in album: シンガーソングハイカー
      type: MusicAlbum
      date published: 2013-10-16
    isrc code: JPPO01147021
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-19T23:19:33+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x17a2b8cd9ae585de2401a7b8658238c7ef625c38be4001a78693e19138bbe2e0
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958796
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958796
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPO01147021
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T02:21:59Z
    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 0x17a2b8cd9ae585de2401a7b8658238c7ef625c38be4001a78693e19138bbe2e0. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:21:59Z), 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/JPPO01147021.
      date published: 2026-07-20T02:21:59Z
    audio: 君がいる
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 115.91
      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: 0.573
      additional property: Energy
        type: PropertyValue
        value: 0.827
      additional property: Speechiness
        type: PropertyValue
        value: 0.035
      additional property: Acousticness
        type: PropertyValue
        value: 0.051
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.201
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.526
      additional property: Loudness (dB)
        type: PropertyValue
        value: -2.714
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: MUSIC TRAIL
  type: MusicAlbum
  date published: 2019-02-06