城田 優
type: MusicGroup
popularity: 2
followers: 119
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2ced8abc8598ee13c4fccd3a646693aadbfa662904ce3014f6b936648a44394f
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/ef5763d2-67db-49c7-afc6-382381c7c34c.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/ef5763d2-67db-49c7-afc6-382381c7c34c.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/ef5763d2-67db-49c7-afc6-382381c7c34c
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-22T02:53:59Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x2ced8abc8598ee13c4fccd3a646693aadbfa662904ce3014f6b936648a44394f","name":"城田 優","registered_at":"2026-06-21T12:51:54Z","symbol":"NIM1928067","token_address":"0x605fd9fdc9f737a18ec4f297d9303853be8deed4","type":"artist","uuid":"ef5763d2-67db-49c7-afc6-382381c7c34c"}
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 0x2ced8abc8598ee13c4fccd3a646693aadbfa662904ce3014f6b936648a44394f. 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/ef5763d2-67db-49c7-afc6-382381c7c34c.json and https://artists.proofprofile.net/proofs/artist/ef5763d2-67db-49c7-afc6-382381c7c34c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-22T02:53:59Z
  text: {"copyright_id":"0x2ced8abc8598ee13c4fccd3a646693aadbfa662904ce3014f6b936648a44394f","name":"城田 優","registered_at":"2026-06-21T12:51:54Z","symbol":"NIM1928067","token_address":"0x605fd9fdc9f737a18ec4f297d9303853be8deed4","type":"artist","uuid":"ef5763d2-67db-49c7-afc6-382381c7c34c"}
album: 夢の種～I'll be by your side
  type: MusicAlbum
  date published: 2024-10-30
  track: 夢の種～I'll be by your side
    type: MusicRecording
    duration: PT5M56S
    duration ms: 356200
    explicit: false
    by artist: 城田 優
    in album: 夢の種～I'll be by your side
      type: MusicAlbum
      date published: 2024-10-30
    isrc code: JPCO02432590
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-21T14:31:38+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x7058299d2a31e18ff42a13bacdc50fb11a8a8908d3fb0ac9b1fb09221255db2c
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 959023
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/959023
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO02432590
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-21T17:33:46Z
    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 0x7058299d2a31e18ff42a13bacdc50fb11a8a8908d3fb0ac9b1fb09221255db2c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:33:46Z), 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/JPCO02432590.
      date published: 2026-07-21T17:33:46Z
    audio: 夢の種～I'll be by your side
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 100.044
      additional property: Musical Key
        type: PropertyValue
        value: 7
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.638
      additional property: Energy
        type: PropertyValue
        value: 0.33
      additional property: Speechiness
        type: PropertyValue
        value: 0.027
      additional property: Acousticness
        type: PropertyValue
        value: 0.953
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.15
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.161
      additional property: Loudness (dB)
        type: PropertyValue
        value: -7.304
      additional property: Key Name
        type: PropertyValue
        value: G
      additional property: Mode Name
        type: PropertyValue
        value: Major