Matsushima Utako
type: MusicGroup
genre: enka
genre: japanese classical
genre: kayokyoku
popularity: 2
followers: 281
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x8da5d09c18ff894c65b6aa484d432b441ec692b6ea6262795fdce00f53e1629b
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954638
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954638
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d51ab0fc-6dd5-476d-9719-5f75f89c510e.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d51ab0fc-6dd5-476d-9719-5f75f89c510e.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d51ab0fc-6dd5-476d-9719-5f75f89c510e
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T03:45:44Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x8da5d09c18ff894c65b6aa484d432b441ec692b6ea6262795fdce00f53e1629b","name":"Matsushima Utako","registered_at":"2026-06-21T02:19:19Z","symbol":"NIM1788421","token_address":"0xb3e7830f1776929bba2c01e0b4f676a63650239c","type":"artist","uuid":"d51ab0fc-6dd5-476d-9719-5f75f89c510e"}
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 0x8da5d09c18ff894c65b6aa484d432b441ec692b6ea6262795fdce00f53e1629b. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d51ab0fc-6dd5-476d-9719-5f75f89c510e.json and https://artists.proofprofile.net/proofs/artist/d51ab0fc-6dd5-476d-9719-5f75f89c510e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T03:45:44Z
  text: {"copyright_id":"0x8da5d09c18ff894c65b6aa484d432b441ec692b6ea6262795fdce00f53e1629b","name":"Matsushima Utako","registered_at":"2026-06-21T02:19:19Z","symbol":"NIM1788421","token_address":"0xb3e7830f1776929bba2c01e0b4f676a63650239c","type":"artist","uuid":"d51ab0fc-6dd5-476d-9719-5f75f89c510e"}
album: Sore Mo Omoide
  type: MusicAlbum
  date published: 2015-03-03
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  type: MusicAlbum
  date published: 2015-03-04
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  type: MusicAlbum
  date published: 2015-03-04
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  type: MusicAlbum
  date published: 2015-03-09
album: Kissaten no Katasumi De
  type: MusicAlbum
  date published: 2015-03-09