Hotaru
type: MusicGroup
genre: vocaloid
popularity: 3
followers: 127
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2a5480dfe0555ea47c4f670ab9bde7ebc1fb60a75bdb2d7840634819e9daf50b
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953997
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953997
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/220de3f2-d840-4d15-a4c8-b953e5483963.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/220de3f2-d840-4d15-a4c8-b953e5483963.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/220de3f2-d840-4d15-a4c8-b953e5483963
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T20:07:57Z
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 0x2a5480dfe0555ea47c4f670ab9bde7ebc1fb60a75bdb2d7840634819e9daf50b. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/220de3f2-d840-4d15-a4c8-b953e5483963.json and https://artists.proofprofile.net/proofs/artist/220de3f2-d840-4d15-a4c8-b953e5483963.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T20:07:57Z
album: Ameagari No Neonlight (feat. IA)
  type: MusicAlbum
  date published: 2020-12-26
album: Milk tea and clock hands
  type: MusicAlbum
  date published: 2021-07-03
album: ミルクティーと時計の針 (Vocaloid ver.)
  type: MusicAlbum
  date published: 2021-07-17
album: Milk Tea & Clock Hands (Vocaloid ver.)
  type: MusicAlbum
  date published: 2021-07-17
album: Laplace
  type: MusicAlbum
  date published: 2022-06-04
album: Laplace
  type: MusicAlbum
  date published: 2022-06-04
album: シーラカンスと体温 (feat. 初音ミク)
  type: MusicAlbum
  date published: 2023-02-18
album: Coelacanth & Your Temperature (feat. HATSUNE MIKU)
  type: MusicAlbum
  date published: 2023-02-18
album: umbrella hole
  type: MusicAlbum
  date published: 2023-04-01
album: あんぶれらほーる
  type: MusicAlbum
  date published: 2023-04-01
album: utopia (feat. KAFU)
  type: MusicAlbum
  date published: 2023-05-27
album: ユートピア (feat. 可不)
  type: MusicAlbum
  date published: 2023-05-27
album: a fragment of doze (feat. KAFU)
  type: MusicAlbum
  date published: 2023-12-23
album: Cradle of Ephemeroptera (feat. KAFU)
  type: MusicAlbum
  date published: 2024-10-23