かんたろう
type: MusicGroup
popularity: 4
followers: 159
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x781d8c5c8aa736dac976204a7970dd0c06082aa41049531144ed91ab97e58155
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954065
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954065
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/4cb2fc04-a226-4de0-ae58-9fba7417f3bc.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/4cb2fc04-a226-4de0-ae58-9fba7417f3bc.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/4cb2fc04-a226-4de0-ae58-9fba7417f3bc
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:10:43Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x781d8c5c8aa736dac976204a7970dd0c06082aa41049531144ed91ab97e58155","name":"かんたろう","registered_at":"2026-06-16T16:23:00Z","symbol":"NIM1108025","token_address":"0xe078be1d206561d3b2b07111cdf86ecb334f4a28","type":"artist","uuid":"4cb2fc04-a226-4de0-ae58-9fba7417f3bc"}
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 0x781d8c5c8aa736dac976204a7970dd0c06082aa41049531144ed91ab97e58155. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4cb2fc04-a226-4de0-ae58-9fba7417f3bc.json and https://artists.proofprofile.net/proofs/artist/4cb2fc04-a226-4de0-ae58-9fba7417f3bc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:10:43Z
  text: {"copyright_id":"0x781d8c5c8aa736dac976204a7970dd0c06082aa41049531144ed91ab97e58155","name":"かんたろう","registered_at":"2026-06-16T16:23:00Z","symbol":"NIM1108025","token_address":"0xe078be1d206561d3b2b07111cdf86ecb334f4a28","type":"artist","uuid":"4cb2fc04-a226-4de0-ae58-9fba7417f3bc"}
album: ぼくって
  type: MusicAlbum
  date published: 2024-02-28
album: ツキノサクラ (feat.アオイエマ。)
  type: MusicAlbum
  date published: 2024-03-27
  track: ツキノサクラ (feat.アオイエマ。)
    type: MusicRecording
    duration: PT3M59S
    duration ms: 239466
    explicit: false
    by artist: かんたろう
    in album: ツキノサクラ (feat.アオイエマ。)
      type: MusicAlbum
      date published: 2024-03-27
    isrc code: JPP302400119
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-18T22:10:27+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xe6f8b40b049217631f5c22857a04677e4e0672cb5c9aa423bb8ce1125f719083
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958622
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958622
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPP302400119
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-18T22:58:55Z
    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 0xe6f8b40b049217631f5c22857a04677e4e0672cb5c9aa423bb8ce1125f719083. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/JPP302400119.
      date published: 2026-07-18T22:58:55Z
    audio: ツキノサクラ (feat.アオイエマ。)
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 80
      additional property: Musical Key
        type: PropertyValue
        value: 11
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.579
      additional property: Energy
        type: PropertyValue
        value: 0.512
      additional property: Speechiness
        type: PropertyValue
        value: 0.032
      additional property: Acousticness
        type: PropertyValue
        value: 0.598
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.134
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.373
      additional property: Loudness (dB)
        type: PropertyValue
        value: -6.898
      additional property: Key Name
        type: PropertyValue
        value: B
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Voyager
  type: MusicAlbum
  date published: 2024-04-24
album: くしゃみんぐ
  type: MusicAlbum
  date published: 2024-05-29
album: 光 feat.YABE
  type: MusicAlbum
  date published: 2024-09-25
album: ヒューマニッシモ
  type: MusicAlbum
  date published: 2024-11-13
album: 告白
  type: MusicAlbum
  date published: 2025-08-27