下川恭平
type: MusicGroup
popularity: 4
followers: 56
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xfe8af6b681b7c0224fadeab3b8c72b8b8d2e0593111edea77d82d58ea560f47a
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954342
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954342
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8cf26fcf-6fe9-4bab-abff-e11d75a174a1.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8cf26fcf-6fe9-4bab-abff-e11d75a174a1.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/8cf26fcf-6fe9-4bab-abff-e11d75a174a1
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:22:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xfe8af6b681b7c0224fadeab3b8c72b8b8d2e0593111edea77d82d58ea560f47a","name":"下川恭平","registered_at":"2026-06-17T14:46:22Z","symbol":"NIM1428404","token_address":"0x5d2f36e282fd44f697bf1e443221ea3bfc2282b5","type":"artist","uuid":"8cf26fcf-6fe9-4bab-abff-e11d75a174a1"}
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8af6b681b7c0224fadeab3b8c72b8b8d2e0593111edea77d82d58ea560f47a. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8cf26fcf-6fe9-4bab-abff-e11d75a174a1.json and https://artists.proofprofile.net/proofs/artist/8cf26fcf-6fe9-4bab-abff-e11d75a174a1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
  text: {"copyright_id":"0xfe8af6b681b7c0224fadeab3b8c72b8b8d2e0593111edea77d82d58ea560f47a","name":"下川恭平","registered_at":"2026-06-17T14:46:22Z","symbol":"NIM1428404","token_address":"0x5d2f36e282fd44f697bf1e443221ea3bfc2282b5","type":"artist","uuid":"8cf26fcf-6fe9-4bab-abff-e11d75a174a1"}
album: 映画「ぼくが生きてる、ふたつの世界」テーマソング
  type: MusicAlbum
  date published: 2025-03-08
  track: letters
    type: MusicRecording
    duration: PT3M59S
    duration ms: 239675
    explicit: false
    by artist: 下川恭平
    in album: 映画「ぼくが生きてる、ふたつの世界」テーマソング
      type: MusicAlbum
      date published: 2025-03-08
    isrc code: TCJPE2550104
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-17T06:19:43+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xfa268fff9bdd6a006b3616d5302f7818f263826899e1b48e614ff11450683a6b
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958376
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958376
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPE2550104
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T06:41:00Z
    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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa268fff9bdd6a006b3616d5302f7818f263826899e1b48e614ff11450683a6b. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/TCJPE2550104.
      date published: 2026-07-17T06:41:00Z
    audio: letters
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 111.8
      additional property: Musical Key
        type: PropertyValue
        value: 6
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 3
      additional property: Danceability
        type: PropertyValue
        value: 0.608
      additional property: Energy
        type: PropertyValue
        value: 0.114
      additional property: Speechiness
        type: PropertyValue
        value: 0.036
      additional property: Acousticness
        type: PropertyValue
        value: 0.868
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.35
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.277
      additional property: Loudness (dB)
        type: PropertyValue
        value: -14.689
      additional property: Key Name
        type: PropertyValue
        value: F#
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: 紡ぐ春
  type: MusicAlbum
  date published: 2025-04-19