Hiroshi "Hiro" Kawaguchi
type: MusicGroup
genre: japanese vgm
popularity: 8
followers: 422
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xed59ec4d3628776513755a0b4790e9969c061a07a5308201f5796aa5d061e051
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954667
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954667
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d53f397a-2e0b-45cf-a892-b2fea84345e0.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d53f397a-2e0b-45cf-a892-b2fea84345e0.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d53f397a-2e0b-45cf-a892-b2fea84345e0
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xed59ec4d3628776513755a0b4790e9969c061a07a5308201f5796aa5d061e051","name":"Hiroshi \"Hiro\" Kawaguchi","registered_at":"2026-06-21T02:45:39Z","symbol":"NIM1792139","token_address":"0x4b77c787090e6f0dc37764d4d57f38ddb79b344a","type":"artist","uuid":"d53f397a-2e0b-45cf-a892-b2fea84345e0"}
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 0xed59ec4d3628776513755a0b4790e9969c061a07a5308201f5796aa5d061e051. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d53f397a-2e0b-45cf-a892-b2fea84345e0.json and https://artists.proofprofile.net/proofs/artist/d53f397a-2e0b-45cf-a892-b2fea84345e0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0xed59ec4d3628776513755a0b4790e9969c061a07a5308201f5796aa5d061e051","name":"Hiroshi \"Hiro\" Kawaguchi","registered_at":"2026-06-21T02:45:39Z","symbol":"NIM1792139","token_address":"0x4b77c787090e6f0dc37764d4d57f38ddb79b344a","type":"artist","uuid":"d53f397a-2e0b-45cf-a892-b2fea84345e0"}
album: Space Harrier (Official Game Soundtrack)
  type: MusicAlbum
  date published: 2022-04-17
  track: MAIN THEME
    type: MusicRecording
    duration: PT4M12S
    duration ms: 252993
    explicit: false
    by artist: Hiroshi "Hiro" Kawaguchi
    in album: Space Harrier (Official Game Soundtrack)
      type: MusicAlbum
      date published: 2022-04-17
    genre: japanese vgm
    isrc code: QZHN62203922
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-17T04:57:20+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x72e2ca7c28c23806b83c94e8d307b5e54b6418532b048306c0fec27949402504
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958368
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958368
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN62203922
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T07:58:16Z
    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 0x72e2ca7c28c23806b83c94e8d307b5e54b6418532b048306c0fec27949402504. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T07:58:16Z), 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/QZHN62203922.
      date published: 2026-07-17T07:58:16Z
    audio: MAIN THEME
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 154.096
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.41
      additional property: Energy
        type: PropertyValue
        value: 0.652
      additional property: Speechiness
        type: PropertyValue
        value: 0.051
      additional property: Acousticness
        type: PropertyValue
        value: 0.032
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.919
      additional property: Liveness
        type: PropertyValue
        value: 0.158
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.718
      additional property: Loudness (dB)
        type: PropertyValue
        value: -12.172
      additional property: Key Name
        type: PropertyValue
        value: F
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: OutRun (Official Game Soundtrack)
  type: MusicAlbum
  date published: 2022-04-17