SKET×Sketch
type: MusicGroup
genre: anime
popularity: 6
followers: 324
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2a26e5da0dc09a144f4f359f06c4c30e9edf00e42bb6540542f7da9131b7d8c7
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954124
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954124
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/7bb0e09a-6ce5-495e-82be-6a6d7ff36de0.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/7bb0e09a-6ce5-495e-82be-6a6d7ff36de0.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/7bb0e09a-6ce5-495e-82be-6a6d7ff36de0
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T18:22:18Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x2a26e5da0dc09a144f4f359f06c4c30e9edf00e42bb6540542f7da9131b7d8c7","name":"SKET×Sketch","registered_at":"2026-06-17T08:41:44Z","symbol":"NIM1341511","token_address":"0x4e45dcddc92a500fe3a6c71f4568a40fcd61d20b","type":"artist","uuid":"7bb0e09a-6ce5-495e-82be-6a6d7ff36de0"}
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 0x2a26e5da0dc09a144f4f359f06c4c30e9edf00e42bb6540542f7da9131b7d8c7. Chain 2 (Bitcoin): anchored in block 954124 (2026-06-17T18:22:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7bb0e09a-6ce5-495e-82be-6a6d7ff36de0.json and https://artists.proofprofile.net/proofs/artist/7bb0e09a-6ce5-495e-82be-6a6d7ff36de0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T18:22:18Z
  text: {"copyright_id":"0x2a26e5da0dc09a144f4f359f06c4c30e9edf00e42bb6540542f7da9131b7d8c7","name":"SKET×Sketch","registered_at":"2026-06-17T08:41:44Z","symbol":"NIM1341511","token_address":"0x4e45dcddc92a500fe3a6c71f4568a40fcd61d20b","type":"artist","uuid":"7bb0e09a-6ce5-495e-82be-6a6d7ff36de0"}
album: 世界は屋上で見渡せた
  type: MusicAlbum
  date published: 2012-08-29
  track: 世界は屋上で見渡せた - 合唱 ver.
    type: MusicRecording
    duration: PT4M27S
    duration ms: 267026
    explicit: false
    by artist: SKET×Sketch
    in album: 世界は屋上で見渡せた
      type: MusicAlbum
      date published: 2012-08-29
    genre: anime
    isrc code: JPB601233802
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-20T01:39:25+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x59aa0e27d8dd48ab349dac7f1d2c1f4ebb7ad01f5029ed1fa5eae85e02d0eee3
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958805
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958805
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPB601233802
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T02:22:58Z
    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 0x59aa0e27d8dd48ab349dac7f1d2c1f4ebb7ad01f5029ed1fa5eae85e02d0eee3. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/JPB601233802.
      date published: 2026-07-20T02:22:58Z
    audio: 世界は屋上で見渡せた - 合唱 ver.
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 204.074
      additional property: Musical Key
        type: PropertyValue
        value: 9
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.381
      additional property: Energy
        type: PropertyValue
        value: 0.509
      additional property: Speechiness
        type: PropertyValue
        value: 0.032
      additional property: Acousticness
        type: PropertyValue
        value: 0.869
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.202
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.308
      additional property: Loudness (dB)
        type: PropertyValue
        value: -5.697
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Major