Classern Quartet
type: MusicGroup
popularity: 11
followers: 618
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2f9301b754df351605476b38428db8e5cae8e5f021d16b1b3fa59dffe2f6a26e
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953750
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953750
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a7ab674b-ad6b-428f-a09b-e8e33e6a2d32.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a7ab674b-ad6b-428f-a09b-e8e33e6a2d32.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/a7ab674b-ad6b-428f-a09b-e8e33e6a2d32
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T06:12:23Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x2f9301b754df351605476b38428db8e5cae8e5f021d16b1b3fa59dffe2f6a26e","name":"Classern Quartet","registered_at":"2026-06-14T22:12:07Z","symbol":"NIM0592224","token_address":"0x5b7d7dba9b181d399c00660af8b95a3ff4f665df","type":"artist","uuid":"a7ab674b-ad6b-428f-a09b-e8e33e6a2d32"}
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 0x2f9301b754df351605476b38428db8e5cae8e5f021d16b1b3fa59dffe2f6a26e. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7ab674b-ad6b-428f-a09b-e8e33e6a2d32.json and https://artists.proofprofile.net/proofs/artist/a7ab674b-ad6b-428f-a09b-e8e33e6a2d32.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T06:12:23Z
  text: {"copyright_id":"0x2f9301b754df351605476b38428db8e5cae8e5f021d16b1b3fa59dffe2f6a26e","name":"Classern Quartet","registered_at":"2026-06-14T22:12:07Z","symbol":"NIM0592224","token_address":"0x5b7d7dba9b181d399c00660af8b95a3ff4f665df","type":"artist","uuid":"a7ab674b-ad6b-428f-a09b-e8e33e6a2d32"}
album: Classern Quartet
  type: MusicAlbum
  date published: 2016-12-23
album: All Smashed Up
  type: MusicAlbum
  date published: 2018-05-18
album: Just Bangers
  type: MusicAlbum
  date published: 2019-03-19
album: Old Town Road
  type: MusicAlbum
  date published: 2019-05-31
album: Sucker
  type: MusicAlbum
  date published: 2019-06-07
album: Speechless
  type: MusicAlbum
  date published: 2019-06-07
album: Summer Sessions
  type: MusicAlbum
  date published: 2019-07-23
album: Opus I
  type: MusicAlbum
  date published: 2019-10-07
album: Anyone
  type: MusicAlbum
  date published: 2020-03-09
album: Everything I Wanted
  type: MusicAlbum
  date published: 2020-03-23
album: Good as Hell
  type: MusicAlbum
  date published: 2020-03-30
album: 10,000 Hours
  type: MusicAlbum
  date published: 2020-04-16
album: Blinding Lights
  type: MusicAlbum
  date published: 2020-05-04
album: Opus II
  type: MusicAlbum
  date published: 2020-06-24
album: Sunday Best
  type: MusicAlbum
  date published: 2020-10-13
album: Cardigan
  type: MusicAlbum
  date published: 2020-10-26
album: My Future
  type: MusicAlbum
  date published: 2020-10-30
album: A Very Classern Christmas
  type: MusicAlbum
  date published: 2020-11-02
album: Watermelon Sugar
  type: MusicAlbum
  date published: 2021-06-15
album: Strange
  type: MusicAlbum
  date published: 2021-08-16
album: Love, Vol. I
  type: MusicAlbum
  date published: 2021-10-12
album: Golden Hour
  type: MusicAlbum
  date published: 2023-09-26
album: Tango Por Havana
  type: MusicAlbum
  date published: 2023-10-17
album: Unholy
  type: MusicAlbum
  date published: 2023-10-30
album: Love, Vol. II
  type: MusicAlbum
  date published: 2025-11-10