HALLCA
type: MusicGroup
genre: city pop
genre: shibuya-kei
popularity: 8
followers: 2498
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x5d2850566c083155b89a992912274ba6a4df4733ee685da3d616f5986f0996f5
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953949
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953949
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0dabb394-0769-4c3d-a8a4-3be7b8c43426.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0dabb394-0769-4c3d-a8a4-3be7b8c43426.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/0dabb394-0769-4c3d-a8a4-3be7b8c43426
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T13:28:01Z
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2850566c083155b89a992912274ba6a4df4733ee685da3d616f5986f0996f5. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0dabb394-0769-4c3d-a8a4-3be7b8c43426.json and https://artists.proofprofile.net/proofs/artist/0dabb394-0769-4c3d-a8a4-3be7b8c43426.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T13:28:01Z
album: Milky Way
  type: MusicAlbum
  date published: 2018-07-21
album: Aperitif e.p
  type: MusicAlbum
  date published: 2018-07-25
album: Aperitif e.p
  type: MusicAlbum
  date published: 2018-07-25
album: burning in blue
  type: MusicAlbum
  date published: 2019-03-01
album: VILLA
  type: MusicAlbum
  date published: 2019-09-25
album: Twisted Rainbow / Pink Medicine
  type: MusicAlbum
  date published: 2020-04-19
album: Twisted Rainbow / Pink Medicine
  type: MusicAlbum
  date published: 2020-04-19
album: Catch your night
  type: MusicAlbum
  date published: 2020-09-27
album: Catch your night
  type: MusicAlbum
  date published: 2020-09-27
album: "PRECIOUS FLIGHT WITH YOU" LIVE ARCHIVE at VARIT
  type: MusicAlbum
  date published: 2021-01-03
album: "PRECIOUS FLIGHT WITH YOU" LIVE ARCHIVE at VARIT
  type: MusicAlbum
  date published: 2021-01-03
album: PARADISE GATE
  type: MusicAlbum
  date published: 2021-11-02
album: PARADISE GATE
  type: MusicAlbum
  date published: 2021-11-24
album: Eternal Light (Blackstone Village Remix)
  type: MusicAlbum
  date published: 2022-06-25
album: Seaside Bar
  type: MusicAlbum
  date published: 2022-10-16
album: Night Driver
  type: MusicAlbum
  date published: 2023-07-11
album: Sugar
  type: MusicAlbum
  date published: 2023-07-18
album: Mind's Eye
  type: MusicAlbum
  date published: 2023-07-25
album: Romantic
  type: MusicAlbum
  date published: 2024-03-14
album: Romantic
  type: MusicAlbum
  date published: 2024-03-14
album: WAVE
  type: MusicAlbum
  date published: 2024-11-02