class
type: MusicGroup
genre: j-pop
genre: kayokyoku
description: Class, Classes, or The Class may refer to: Common uses not otherwise categorized Class (biology), a taxonomic rank Class (knowledge representation), a collection of individuals or objects Class (
popularity: 37
followers: 9458
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2fe7de1b8b9c6640cc46f75f5c73354018efdec017a5b4a9dc4cd43dbf94b55e
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953407
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953407
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fd05f42b-a715-4a8e-9326-2a860315b2a3.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fd05f42b-a715-4a8e-9326-2a860315b2a3.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/fd05f42b-a715-4a8e-9326-2a860315b2a3
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-12T19:24:56Z
additional property: OTSCanonicalRecord
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 0x2fe7de1b8b9c6640cc46f75f5c73354018efdec017a5b4a9dc4cd43dbf94b55e. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fd05f42b-a715-4a8e-9326-2a860315b2a3.json and https://artists.proofprofile.net/proofs/artist/fd05f42b-a715-4a8e-9326-2a860315b2a3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T19:24:56Z
album: 夏の日の1993
  type: MusicAlbum
  date published: 1993-04-21
album: Mellow Prism
  type: MusicAlbum
  date published: 1993-07-26
album: もう君を離さない
  type: MusicAlbum
  date published: 1993-10-18
album: Duo
  type: MusicAlbum
  date published: 1993-11-15
album: Holiday
  type: MusicAlbum
  date published: 1994-03-28
album: Re-Prologue
  type: MusicAlbum
  date published: 1994-04-25
album: 永遠の素顔
  type: MusicAlbum
  date published: 1994-05-16
album: 百万本の雨
  type: MusicAlbum
  date published: 1994-10-31
album: CLASSIX
  type: MusicAlbum
  date published: 1994-11-14
album: 夏にかかるWedding Song
  type: MusicAlbum
  date published: 1995-05-25
album: That's cool!
  type: MusicAlbum
  date published: 1995-06-22
album: 君だけが知ってる
  type: MusicAlbum
  date published: 1995-10-21
album: class book 〜class 1993 to 1996 best〜
  type: MusicAlbum
  date published: 1996-03-28
  track: もう君を離さない
    type: MusicRecording
    duration: PT4M16S
    duration ms: 256133
    explicit: false
    by artist: class
    in album: class book 〜class 1993 to 1996 best〜
      type: MusicAlbum
      date published: 1996-03-28
    genre: j-pop
    genre: kayokyoku
    isrc code: JPAP09308301
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-17T00:43:00+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xb226abf882cd1b4b336a94258f717c9ed004eb482ed04fbb293673373098fb17
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958342
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958342
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPAP09308301
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T01:09:53Z
    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 0xb226abf882cd1b4b336a94258f717c9ed004eb482ed04fbb293673373098fb17. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/JPAP09308301.
      date published: 2026-07-17T01:09:53Z
    audio: もう君を離さない
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 121.907
      additional property: Musical Key
        type: PropertyValue
        value: 2
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.621
      additional property: Energy
        type: PropertyValue
        value: 0.756
      additional property: Speechiness
        type: PropertyValue
        value: 0.039
      additional property: Acousticness
        type: PropertyValue
        value: 0.302
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.227
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.553
      additional property: Loudness (dB)
        type: PropertyValue
        value: -9.416
      additional property: Key Name
        type: PropertyValue
        value: D
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: 夏の日の1993 〜2003 up to date session〜
  type: MusicAlbum
  date published: 2003-07-09
album: 夏記
  type: MusicAlbum
  date published: 2004-07-21
album: 十六年と一日
  type: MusicAlbum
  date published: 2009-04-22