関裕美 (CV: 会沢紗弥)
type: MusicGroup
popularity: 14
followers: 169
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x3e79628481e03783054904d39d5e53ce774641b3dc67fcf961c3fa8a50a06733
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953742
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953742
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/76351708-9689-4da0-ab67-1ba5b09a1445.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/76351708-9689-4da0-ab67-1ba5b09a1445.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/76351708-9689-4da0-ab67-1ba5b09a1445
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T04:47:56Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x3e79628481e03783054904d39d5e53ce774641b3dc67fcf961c3fa8a50a06733","name":"関裕美 (CV: 会沢紗弥)","registered_at":"2026-06-14T16:57:02Z","symbol":"NIM0517114","token_address":"0x30026910827bbcd191984db4b5da1e81f27f40f6","type":"artist","uuid":"76351708-9689-4da0-ab67-1ba5b09a1445"}
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 0x3e79628481e03783054904d39d5e53ce774641b3dc67fcf961c3fa8a50a06733. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/76351708-9689-4da0-ab67-1ba5b09a1445.json and https://artists.proofprofile.net/proofs/artist/76351708-9689-4da0-ab67-1ba5b09a1445.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T04:47:56Z
  text: {"copyright_id":"0x3e79628481e03783054904d39d5e53ce774641b3dc67fcf961c3fa8a50a06733","name":"関裕美 (CV: 会沢紗弥)","registered_at":"2026-06-14T16:57:02Z","symbol":"NIM0517114","token_address":"0x30026910827bbcd191984db4b5da1e81f27f40f6","type":"artist","uuid":"76351708-9689-4da0-ab67-1ba5b09a1445"}
album: 書きかけのラブレター (GAME VERSION)
  type: MusicAlbum
  date published: 2024-03-20
  track: 書きかけのラブレター - GAME VERSION
    type: MusicRecording
    duration: PT2M9S
    duration ms: 129264
    explicit: false
    by artist: 関裕美 (CV: 会沢紗弥)
    in album: 書きかけのラブレター (GAME VERSION)
      type: MusicAlbum
      date published: 2024-03-20
    isrc code: JPCO02404140
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-21T18:44:30+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x150f0ac69dfc5d4e80d7fb847128163e3f798a826f77189499bbf2a5958adfe4
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 959047
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/959047
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO02404140
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-21T19:17:28Z
    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 0x150f0ac69dfc5d4e80d7fb847128163e3f798a826f77189499bbf2a5958adfe4. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/JPCO02404140.
      date published: 2026-07-21T19:17:28Z
    audio: 書きかけのラブレター - GAME VERSION
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 163.935
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.536
      additional property: Energy
        type: PropertyValue
        value: 0.85
      additional property: Speechiness
        type: PropertyValue
        value: 0.041
      additional property: Acousticness
        type: PropertyValue
        value: 0.043
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.097
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.731
      additional property: Loudness (dB)
        type: PropertyValue
        value: -4.24
      additional property: Key Name
        type: PropertyValue
        value: F
      additional property: Mode Name
        type: PropertyValue
        value: Major