坂口由起子
type: MusicGroup
popularity: 2
followers: 28
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xca10dd965154b893d9c5a99fd6bd3628f5a0686379965cdab7f9f35fe4b041d8
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954650
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954650
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/da050104-025e-453f-b4d8-a27ec007ee71.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/da050104-025e-453f-b4d8-a27ec007ee71.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/da050104-025e-453f-b4d8-a27ec007ee71
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T04:51:12Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xca10dd965154b893d9c5a99fd6bd3628f5a0686379965cdab7f9f35fe4b041d8","name":"坂口由起子","registered_at":"2026-06-21T04:28:20Z","symbol":"NIM1816079","token_address":"0xbf821ec163f9be6eab6e4bbb2ce36e52cd9b5dc5","type":"artist","uuid":"da050104-025e-453f-b4d8-a27ec007ee71"}
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 0xca10dd965154b893d9c5a99fd6bd3628f5a0686379965cdab7f9f35fe4b041d8. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da050104-025e-453f-b4d8-a27ec007ee71.json and https://artists.proofprofile.net/proofs/artist/da050104-025e-453f-b4d8-a27ec007ee71.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T04:51:12Z
  text: {"copyright_id":"0xca10dd965154b893d9c5a99fd6bd3628f5a0686379965cdab7f9f35fe4b041d8","name":"坂口由起子","registered_at":"2026-06-21T04:28:20Z","symbol":"NIM1816079","token_address":"0xbf821ec163f9be6eab6e4bbb2ce36e52cd9b5dc5","type":"artist","uuid":"da050104-025e-453f-b4d8-a27ec007ee71"}
album: 榛
  type: MusicAlbum
  date published: 2008-02-29
album: うたとカラオケ 日本昔ばなし その1
  type: MusicAlbum
  date published: 2020-07-03
  track: はなさかじいさん
    type: MusicRecording
    duration: PT2M23S
    duration ms: 143975
    explicit: false
    by artist: 坂口由起子
    in album: うたとカラオケ 日本昔ばなし その1
      type: MusicAlbum
      date published: 2020-07-03
    isrc code: TCJPL2050835
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-22T05:11:23+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xb0d6265c2b06ce97b8ffabb7eaba4a560ba283be2da51f30c984f0c852fd1085
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 959105
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/959105
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPL2050835
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-22T08:07:41Z
    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 0xb0d6265c2b06ce97b8ffabb7eaba4a560ba283be2da51f30c984f0c852fd1085. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:07:41Z), 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/TCJPL2050835.
      date published: 2026-07-22T08:07:41Z
    audio: はなさかじいさん
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 109.963
      additional property: Musical Key
        type: PropertyValue
        value: 3
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.663
      additional property: Energy
        type: PropertyValue
        value: 0.49
      additional property: Speechiness
        type: PropertyValue
        value: 0.027
      additional property: Acousticness
        type: PropertyValue
        value: 0.564
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.068
      additional property: Liveness
        type: PropertyValue
        value: 0.243
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.851
      additional property: Loudness (dB)
        type: PropertyValue
        value: -9.086
      additional property: Key Name
        type: PropertyValue
        value: Eb
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: うたとカラオケ 日本昔ばなし その2
  type: MusicAlbum
  date published: 2020-07-03