BLACKCALL
type: MusicGroup
genre: vocaloid
popularity: 4
followers: 338
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x8ccbb09c711746664529b10120f0298454141775b5255ef7e0e3ca5d49488516
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954342
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954342
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/811ec174-34eb-4372-8165-df519e7cbdc4.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/811ec174-34eb-4372-8165-df519e7cbdc4.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/811ec174-34eb-4372-8165-df519e7cbdc4
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:22:39Z
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 0x8ccbb09c711746664529b10120f0298454141775b5255ef7e0e3ca5d49488516. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/811ec174-34eb-4372-8165-df519e7cbdc4.json and https://artists.proofprofile.net/proofs/artist/811ec174-34eb-4372-8165-df519e7cbdc4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
album: When I Could Not Do Anything (아무것도 할 수 없을때)
  type: MusicAlbum
  date published: 1905-07-05
album: Love Me
  type: MusicAlbum
  date published: 2012-07-31
album: Higher
  type: MusicAlbum
  date published: 2012-09-11
album: Musical Power
  type: MusicAlbum
  date published: 2012-10-09
album: Musical Power
  type: MusicAlbum
  date published: 2012-10-09
album: To See You
  type: MusicAlbum
  date published: 2012-11-12
album: Nightmare
  type: MusicAlbum
  date published: 2012-11-22
album: Show Me Your Heart
  type: MusicAlbum
  date published: 2012-12-03
album: Auld Lang Syne
  type: MusicAlbum
  date published: 2012-12-11
album: Restart!
  type: MusicAlbum
  date published: 2013-01-02
album: Love Ranking
  type: MusicAlbum
  date published: 2013-02-03