The Pen Friend Club
type: MusicGroup
genre: album rock
genre: city pop
genre: garage rock
genre: neo soul
genre: power pop
genre: shibuya-kei
popularity: 14
followers: 1416
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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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09462cf1ea3efc09314ff86dbd31518245172450f4aaeccccff6047beb4cbcc7. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b3b90f9-1a13-4c2c-ac4c-58e81106bf5b.json and https://artists.proofprofile.net/proofs/artist/3b3b90f9-1a13-4c2c-ac4c-58e81106bf5b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T13:54:28Z
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album: Three By The Pen Friend Club
  type: MusicAlbum
  date published: 2012-12-01
album: Four By The Pen Friend Club
  type: MusicAlbum
  date published: 2014-01-01
album: Sound Of The Pen Friend Club
  type: MusicAlbum
  date published: 2014-04-16
album: Sound of the Pen Friend Club
  type: MusicAlbum
  date published: 2014-04-23
album: Sound Of The Pen Friend Club
  type: MusicAlbum
  date published: 2014-04-23
album: Spirit Of The Pen Friend Club
  type: MusicAlbum
  date published: 2015-02-11
album: Spirit Of The Pen Friend Club
  type: MusicAlbum
  date published: 2015-02-11
album: Tell Me (Do You Really Love Me?) / The Monkey's Uncle
  type: MusicAlbum
  date published: 2015-03-25
album: I Like You / Wichita Lineman
  type: MusicAlbum
  date published: 2015-04-18
album: 街のアンサンブル / 土曜日の恋人
  type: MusicAlbum
  date published: 2015-05-10
album: Season Of The Pen Friend Club
  type: MusicAlbum
  date published: 2016-01-20
album: Season Of The Pen Friend Club - Remixed & Remastered Edition
  type: MusicAlbum
  date published: 2016-06-19
album: ふたりの夕日ライン / 微笑んで
  type: MusicAlbum
  date published: 2017-01-14
album: Sherry She Needs Me / River Deep - Mountain High
  type: MusicAlbum
  date published: 2017-01-24
album: Wonderful World Of The Pen Friend Club
  type: MusicAlbum
  date published: 2017-02-08
album: Wonderful World Of The Pen Friend Club
  type: MusicAlbum
  date published: 2017-02-08
album: Wonderful World of The Pen Friend Club
  type: MusicAlbum
  date published: 2017-02-22
album: Best Of The Pen Friend Club 2012-2017
  type: MusicAlbum
  date published: 2017-09-06
  track: 土曜日の恋人
    type: MusicRecording
    duration: PT3M10S
    duration ms: 190906
    explicit: false
    by artist: The Pen Friend Club
    in album: Best Of The Pen Friend Club 2012-2017
      type: MusicAlbum
      date published: 2017-09-06
    genre: album rock
    genre: city pop
    genre: garage rock
    genre: neo soul
    genre: power pop
    genre: shibuya-kei
    isrc code: JPB621701385
    additional property: CopyrightID
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    additional property: OTSTimestamp
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      value: 2026-07-03T08:56:35Z
    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 0x6bb08b784d170f7f1c7a3348bf81235ea3597e6fd81194af04d89de5d467f8e6. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/JPB621701385.
      date published: 2026-07-03T08:56:35Z
    audio: 土曜日の恋人
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 159.902
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.367
      additional property: Energy
        type: PropertyValue
        value: 0.676
      additional property: Speechiness
        type: PropertyValue
        value: 0.028
      additional property: Acousticness
        type: PropertyValue
        value: 0.059
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.154
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.545
      additional property: Loudness (dB)
        type: PropertyValue
        value: -4.718
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Garden Of The Pen Friend Club
  type: MusicAlbum
  date published: 2018-03-21
album: Garden Of The Pen Friend Club
  type: MusicAlbum
  date published: 2018-03-21
album: Garden Of The Pen Friend Club
  type: MusicAlbum
  date published: 2018-03-21
album: Sound Of The Pen Friend Club (Remixed & Remastered Edition)
  type: MusicAlbum
  date published: 2019-06-19
album: Spirit Of The Pen Friend Club (Remixed & Remastered Edition)
album: Wonderful World Of The Pen Friend Club - Remixed & Remastered Edition
album: 飛翔する日常 / Don't Take Your Time
album: Along Comes Mary / Love Can Go The Distance
album: 一本の音楽 / 八月の雨の日
album: IN CONCERT
album: Merry Christmas From The Pen Friend Club
album: 蛍の光 (A CAPPELLA ON THE BEACH)
album: The Sun Is Up
album: Beyond The Railroad
album: The Pen Friend Club
album: Darlin' / 土曜日の恋人
album: Back In The Pen Friend Club
album: Ketzal
album: Best Of The Pen Friend Club 2018-2024
album: The Pen Friend Club (Remixed Edition)

Spirit Of The Pen Friend Club (Remixed & Remastered Edition)
type: MusicAlbum
date published: 2019-06-19

Wonderful World Of The Pen Friend Club - Remixed & Remastered Edition
type: MusicAlbum
date published: 2019-06-19

飛翔する日常 / Don't Take Your Time
type: MusicAlbum
date published: 2020-02-07

Along Comes Mary / Love Can Go The Distance
type: MusicAlbum
date published: 2020-03-25

一本の音楽 / 八月の雨の日
type: MusicAlbum
date published: 2020-08-08

一本の音楽 / 八月の雨の日
type: MusicAlbum
date published: 2020-09-22

IN CONCERT
type: MusicAlbum
date published: 2020-09-23

Garden Of The Pen Friend Club
type: MusicAlbum
date published: 2021-06-24

Merry Christmas From The Pen Friend Club
type: MusicAlbum
date published: 2021-11-24

蛍の光 (A CAPPELLA ON THE BEACH)
type: MusicAlbum
date published: 2022-06-29

The Sun Is Up
type: MusicAlbum
date published: 2022-07-13

Beyond The Railroad
type: MusicAlbum
date published: 2022-08-17

The Pen Friend Club
type: MusicAlbum
date published: 2022-09-07

Darlin' / 土曜日の恋人
type: MusicAlbum
date published: 2024-02-03

Back In The Pen Friend Club
type: MusicAlbum
date published: 2024-05-01

Ketzal
type: MusicAlbum
date published: 2024-10-23

Best Of The Pen Friend Club 2018-2024
type: MusicAlbum
date published: 2024-11-06

The Pen Friend Club (Remixed Edition)
type: MusicAlbum
date published: 2025-03-20