Hirokazu Akiyama
type: MusicGroup
popularity: 6
followers: 103
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xddb6d46757e9018cfd0931dd30b0961b151d96b3977049fd5591c0dfd7f5d8b0
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954784
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954784
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e84dc57d-5ccc-455f-b4fe-50c7c4f4626b.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e84dc57d-5ccc-455f-b4fe-50c7c4f4626b.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/e84dc57d-5ccc-455f-b4fe-50c7c4f4626b
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-22T02:53:59Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xddb6d46757e9018cfd0931dd30b0961b151d96b3977049fd5591c0dfd7f5d8b0","name":"Hirokazu Akiyama","registered_at":"2026-06-21T09:37:27Z","symbol":"NIM1886512","token_address":"0xb09b28ae82af53174bd873422057f7a24ed33285","type":"artist","uuid":"e84dc57d-5ccc-455f-b4fe-50c7c4f4626b"}
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 0xddb6d46757e9018cfd0931dd30b0961b151d96b3977049fd5591c0dfd7f5d8b0. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e84dc57d-5ccc-455f-b4fe-50c7c4f4626b.json and https://artists.proofprofile.net/proofs/artist/e84dc57d-5ccc-455f-b4fe-50c7c4f4626b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-22T02:53:59Z
  text: {"copyright_id":"0xddb6d46757e9018cfd0931dd30b0961b151d96b3977049fd5591c0dfd7f5d8b0","name":"Hirokazu Akiyama","registered_at":"2026-06-21T09:37:27Z","symbol":"NIM1886512","token_address":"0xb09b28ae82af53174bd873422057f7a24ed33285","type":"artist","uuid":"e84dc57d-5ccc-455f-b4fe-50c7c4f4626b"}
album: H/MIX Vol.1 Japanese style Fantasy
  type: MusicAlbum
  date published: 2024-06-22
  track: Evening Festival Breeze
    type: MusicRecording
    duration: PT3M41S
    duration ms: 221839
    explicit: false
    by artist: Hirokazu Akiyama
    in album: H/MIX Vol.1 Japanese style Fantasy
      type: MusicAlbum
      date published: 2024-06-22
    isrc code: JPY732400451
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-19T18:52:25+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xc64b56a69c045ba4062e689eebff47b8fc1906a7349236948ea5f67c3fbe69cd
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958770
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958770
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPY732400451
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-19T21:54:38Z
    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 0xc64b56a69c045ba4062e689eebff47b8fc1906a7349236948ea5f67c3fbe69cd. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:54:38Z), 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/JPY732400451.
      date published: 2026-07-19T21:54:38Z
    audio: Evening Festival Breeze
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 87.973
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.415
      additional property: Energy
        type: PropertyValue
        value: 0.263
      additional property: Speechiness
        type: PropertyValue
        value: 0.027
      additional property: Acousticness
        type: PropertyValue
        value: 0.312
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.265
      additional property: Liveness
        type: PropertyValue
        value: 0.239
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.159
      additional property: Loudness (dB)
        type: PropertyValue
        value: -13.764
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Major