春川 宙(CV.山本 和臣)
type: MusicGroup
popularity: 23
followers: 151
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xdaa0e26d146d537d545199db3c7ae3f6f5299af860bbf7822e8a00d40e411af5
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953407
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953407
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/41bdd43b-7215-4b25-ad48-cef6922fb789.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/41bdd43b-7215-4b25-ad48-cef6922fb789.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/41bdd43b-7215-4b25-ad48-cef6922fb789
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-12T19:24:56Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xdaa0e26d146d537d545199db3c7ae3f6f5299af860bbf7822e8a00d40e411af5","name":"春川 宙(CV.山本 和臣)","registered_at":"2026-06-11T17:49:15Z","symbol":"NIM0085678","token_address":"0x1878b4f3c27a1f28e9f8a61f7b2d50c7d6d4e30e","type":"artist","uuid":"41bdd43b-7215-4b25-ad48-cef6922fb789"}
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 0xdaa0e26d146d537d545199db3c7ae3f6f5299af860bbf7822e8a00d40e411af5. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/41bdd43b-7215-4b25-ad48-cef6922fb789.json and https://artists.proofprofile.net/proofs/artist/41bdd43b-7215-4b25-ad48-cef6922fb789.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T19:24:56Z
  text: {"copyright_id":"0xdaa0e26d146d537d545199db3c7ae3f6f5299af860bbf7822e8a00d40e411af5","name":"春川 宙(CV.山本 和臣)","registered_at":"2026-06-11T17:49:15Z","symbol":"NIM0085678","token_address":"0x1878b4f3c27a1f28e9f8a61f7b2d50c7d6d4e30e","type":"artist","uuid":"41bdd43b-7215-4b25-ad48-cef6922fb789"}
album: 春川 宙「Smiling Flower’s Season!」あんさんぶるスターズ！！ ESアイドルソング Solo -Bright me up!!-
  type: MusicAlbum
  date published: 2025-10-10
  track: Smiling Flower’s Season!
    type: MusicRecording
    duration: PT3M0S
    duration ms: 180280
    explicit: false
    by artist: 春川 宙(CV.山本 和臣)
    in album: 春川 宙「Smiling Flower’s Season!」あんさんぶるスターズ！！ ESアイドルソング Solo -Bright me up!!-
      type: MusicAlbum
      date published: 2025-10-10
    isrc code: JPD642500291
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-06T02:39:20+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x7a0ceb7931c15f3c728e3204c2328802c58cb0e577d44f0633bafd54c2bd9e73
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956889
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956889
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPD642500291
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-06T06:56:49Z
    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 0x7a0ceb7931c15f3c728e3204c2328802c58cb0e577d44f0633bafd54c2bd9e73. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/JPD642500291.
      date published: 2026-07-06T06:56:49Z
    audio: Smiling Flower’s Season!
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 174.152
      additional property: Musical Key
        type: PropertyValue
        value: 11
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.593
      additional property: Energy
        type: PropertyValue
        value: 0.975
      additional property: Speechiness
        type: PropertyValue
        value: 0.103
      additional property: Acousticness
        type: PropertyValue
        value: 0.072
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.348
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.706
      additional property: Loudness (dB)
        type: PropertyValue
        value: -4.125
      additional property: Key Name
        type: PropertyValue
        value: B
      additional property: Mode Name
        type: PropertyValue
        value: Minor