メトロワ
type: MusicGroup
popularity: 5
followers: 199
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xafc0f0b065adbc32343b17fa764c009acc9f2de0e77aec7763720870c9471fcb
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954784
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954784
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fefb9b58-e1c8-487d-bddc-28a6405e61b0.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fefb9b58-e1c8-487d-bddc-28a6405e61b0.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/fefb9b58-e1c8-487d-bddc-28a6405e61b0
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-22T02:53:59Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xafc0f0b065adbc32343b17fa764c009acc9f2de0e77aec7763720870c9471fcb","name":"メトロワ","registered_at":"2026-06-21T18:47:01Z","symbol":"NIM2005318","token_address":"0x12380ed92374242e07fa16d2e43e19cb759d28b2","type":"artist","uuid":"fefb9b58-e1c8-487d-bddc-28a6405e61b0"}
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 0xafc0f0b065adbc32343b17fa764c009acc9f2de0e77aec7763720870c9471fcb. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fefb9b58-e1c8-487d-bddc-28a6405e61b0.json and https://artists.proofprofile.net/proofs/artist/fefb9b58-e1c8-487d-bddc-28a6405e61b0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-22T02:53:59Z
  text: {"copyright_id":"0xafc0f0b065adbc32343b17fa764c009acc9f2de0e77aec7763720870c9471fcb","name":"メトロワ","registered_at":"2026-06-21T18:47:01Z","symbol":"NIM2005318","token_address":"0x12380ed92374242e07fa16d2e43e19cb759d28b2","type":"artist","uuid":"fefb9b58-e1c8-487d-bddc-28a6405e61b0"}
album: Bouquet
  type: MusicAlbum
  date published: 2024-05-25
  track: 彼岸花
    type: MusicRecording
    duration: PT4M56S
    duration ms: 296718
    explicit: false
    by artist: メトロワ
    in album: Bouquet
      type: MusicAlbum
      date published: 2024-05-25
    isrc code: JP92A2416683
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-03T23:23:15+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x10debe7089dcdce1ab06a7413b09cc5510a04b58365ab2f6c9af59e9a32dc4cb
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956634
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956634
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JP92A2416683
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-04T10:04:33Z
    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 0x10debe7089dcdce1ab06a7413b09cc5510a04b58365ab2f6c9af59e9a32dc4cb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/JP92A2416683.
      date published: 2026-07-04T10:04:33Z
    audio: 彼岸花
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 127.92
      additional property: Musical Key
        type: PropertyValue
        value: 8
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 3
      additional property: Danceability
        type: PropertyValue
        value: 0.571
      additional property: Energy
        type: PropertyValue
        value: 0.771
      additional property: Speechiness
        type: PropertyValue
        value: 0.04
      additional property: Acousticness
        type: PropertyValue
        value: 0.426
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.128
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.514
      additional property: Loudness (dB)
        type: PropertyValue
        value: -4.121
      additional property: Key Name
        type: PropertyValue
        value: Ab
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: アカツキ
  type: MusicAlbum
  date published: 2024-12-29
album: unknown
  type: MusicAlbum
  date published: 2025-07-10
album: 夕暮れ
  type: MusicAlbum
  date published: 2025-10-17