Seiha Nagasawa
type: MusicGroup
popularity: 2
followers: 12
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf79d9588c169348049b5fb40cc8f7608783cca46516b9f27b97f096335def6a7
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/eeaa0d3e-4884-4e1d-9b73-84d99bb9ec65.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/eeaa0d3e-4884-4e1d-9b73-84d99bb9ec65.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/eeaa0d3e-4884-4e1d-9b73-84d99bb9ec65
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T13:42:37Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xf79d9588c169348049b5fb40cc8f7608783cca46516b9f27b97f096335def6a7","name":"Seiha Nagasawa","registered_at":"2026-06-21T12:16:01Z","symbol":"NIM1919983","token_address":"0x3ff535733d1d58a7b101d8756a0ab2c01083675d","type":"artist","uuid":"eeaa0d3e-4884-4e1d-9b73-84d99bb9ec65"}
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 0xf79d9588c169348049b5fb40cc8f7608783cca46516b9f27b97f096335def6a7. 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/eeaa0d3e-4884-4e1d-9b73-84d99bb9ec65.json and https://artists.proofprofile.net/proofs/artist/eeaa0d3e-4884-4e1d-9b73-84d99bb9ec65.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T13:42:37Z
  text: {"copyright_id":"0xf79d9588c169348049b5fb40cc8f7608783cca46516b9f27b97f096335def6a7","name":"Seiha Nagasawa","registered_at":"2026-06-21T12:16:01Z","symbol":"NIM1919983","token_address":"0x3ff535733d1d58a7b101d8756a0ab2c01083675d","type":"artist","uuid":"eeaa0d3e-4884-4e1d-9b73-84d99bb9ec65"}
album: POLO
  type: MusicAlbum
  date published: 2025-04-12
album: POLO
  type: MusicAlbum
  date published: 2025-04-12
album: Leave Me Alone
  type: MusicAlbum
  date published: 2025-06-27
album: Leave Me Alone
  type: MusicAlbum
  date published: 2025-06-27
  track: Leave Me Alone
    type: MusicRecording
    duration: PT2M15S
    duration ms: 135202
    explicit: true
    by artist: Seiha Nagasawa
    in album: Leave Me Alone
      type: MusicAlbum
      date published: 2025-06-27
    isrc code: TCJPJ2522781
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-19T23:48:36+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x3fca75923b80d6c495b726a4c78386fefed6eaac8b392951ae68b9bc8135e26e
    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/TCJPJ2522781
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T02:51:39Z
    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 0x3fca75923b80d6c495b726a4c78386fefed6eaac8b392951ae68b9bc8135e26e. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:51:39Z), 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/TCJPJ2522781.
      date published: 2026-07-20T02:51:39Z
    audio: Leave Me Alone
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 148.088
      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: 0.676
      additional property: Energy
        type: PropertyValue
        value: 0.741
      additional property: Speechiness
        type: PropertyValue
        value: 0.209
      additional property: Acousticness
        type: PropertyValue
        value: 0.234
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.19
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.275
      additional property: Loudness (dB)
        type: PropertyValue
        value: -4.763
      additional property: Key Name
        type: PropertyValue
        value: E
      additional property: Mode Name
        type: PropertyValue
        value: Minor