Sean Matsukawa
type: MusicGroup
genre: indie r&b
popularity: 5
followers: 840
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x25a21eb9e5a62f10d72c0f7705f9350e6bd38201d0fcc3f861bc1adcd5fc5039
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/ee872ad4-5683-4dde-8f0d-ba7e62045616.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/ee872ad4-5683-4dde-8f0d-ba7e62045616.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/ee872ad4-5683-4dde-8f0d-ba7e62045616
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T13:42:37Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x25a21eb9e5a62f10d72c0f7705f9350e6bd38201d0fcc3f861bc1adcd5fc5039","name":"Sean Matsukawa","registered_at":"2026-06-21T11:46:29Z","symbol":"NIM1914809","token_address":"0x52a406bc22d3c81b191526efe32fcd9839afb1a7","type":"artist","uuid":"ee872ad4-5683-4dde-8f0d-ba7e62045616"}
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 0x25a21eb9e5a62f10d72c0f7705f9350e6bd38201d0fcc3f861bc1adcd5fc5039. 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/ee872ad4-5683-4dde-8f0d-ba7e62045616.json and https://artists.proofprofile.net/proofs/artist/ee872ad4-5683-4dde-8f0d-ba7e62045616.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T13:42:37Z
  text: {"copyright_id":"0x25a21eb9e5a62f10d72c0f7705f9350e6bd38201d0fcc3f861bc1adcd5fc5039","name":"Sean Matsukawa","registered_at":"2026-06-21T11:46:29Z","symbol":"NIM1914809","token_address":"0x52a406bc22d3c81b191526efe32fcd9839afb1a7","type":"artist","uuid":"ee872ad4-5683-4dde-8f0d-ba7e62045616"}
album: Vincent Van Gogh
  type: MusicAlbum
  date published: 2015-07-17
album: Maple
  type: MusicAlbum
  date published: 2017-12-30
album: Spiderweb
  type: MusicAlbum
  date published: 2018-01-31
  track: Spiderweb
    type: MusicRecording
    duration: PT3M30S
    duration ms: 210000
    explicit: true
    by artist: Sean Matsukawa
    in album: Spiderweb
      type: MusicAlbum
      date published: 2018-01-31
    genre: indie r&b
    isrc code: QM24S1800320
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-03T19:26:13+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x44c0df59a571bec395a59879ffbd31ab17349ec651ce623c91028ec7a4e2d2cf
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956551
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956551
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM24S1800320
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-03T21:18:05Z
    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 0x44c0df59a571bec395a59879ffbd31ab17349ec651ce623c91028ec7a4e2d2cf. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QM24S1800320.
      date published: 2026-07-03T21:18:05Z
    audio: Spiderweb
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 109.99
      additional property: Musical Key
        type: PropertyValue
        value: 2
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.976
      additional property: Energy
        type: PropertyValue
        value: 0.416
      additional property: Speechiness
        type: PropertyValue
        value: 0.059
      additional property: Acousticness
        type: PropertyValue
        value: 0.146
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.125
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.863
      additional property: Loudness (dB)
        type: PropertyValue
        value: -9.515
      additional property: Key Name
        type: PropertyValue
        value: D
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Palm
  type: MusicAlbum
  date published: 2018-04-21
album: Palm
  type: MusicAlbum
  date published: 2018-04-30
album: Drunk.
  type: MusicAlbum
  date published: 2018-06-12
album: Left Hand, Right Hand
  type: MusicAlbum
  date published: 2019-01-10
album: Left Hand, Right Hand
  type: MusicAlbum
  date published: 2019-01-10
album: Anyway.
  type: MusicAlbum
  date published: 2019-08-10
album: GENOCIDE
  type: MusicAlbum
  date published: 2020-05-27
album: ANYWAY.
  type: MusicAlbum
  date published: 2020-12-24
album: BLEED.
  type: MusicAlbum
  date published: 2022-05-02
album: FACES.
  type: MusicAlbum
  date published: 2022-05-16
album: Army of Two
  type: MusicAlbum
  date published: 2022-11-01