Masayuki Kawaguchi
type: MusicGroup
popularity: 2
followers: 21
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x12d307f8648fd90e0f637b5001ba5e546065dcf1c6ebc76b8192256cc34304cd
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/1fe4d6ea-051a-45be-8358-be2feb8fc0e7.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1fe4d6ea-051a-45be-8358-be2feb8fc0e7.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/1fe4d6ea-051a-45be-8358-be2feb8fc0e7
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T13:28:01Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x12d307f8648fd90e0f637b5001ba5e546065dcf1c6ebc76b8192256cc34304cd","name":"Masayuki Kawaguchi","registered_at":"2026-06-16T00:39:52Z","symbol":"NIM0882887","token_address":"0x7ea6e77f6c8d82d165214cd02c066987d346f4a5","type":"artist","uuid":"1fe4d6ea-051a-45be-8358-be2feb8fc0e7"}
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 0x12d307f8648fd90e0f637b5001ba5e546065dcf1c6ebc76b8192256cc34304cd. 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/1fe4d6ea-051a-45be-8358-be2feb8fc0e7.json and https://artists.proofprofile.net/proofs/artist/1fe4d6ea-051a-45be-8358-be2feb8fc0e7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T13:28:01Z
  text: {"copyright_id":"0x12d307f8648fd90e0f637b5001ba5e546065dcf1c6ebc76b8192256cc34304cd","name":"Masayuki Kawaguchi","registered_at":"2026-06-16T00:39:52Z","symbol":"NIM0882887","token_address":"0x7ea6e77f6c8d82d165214cd02c066987d346f4a5","type":"artist","uuid":"1fe4d6ea-051a-45be-8358-be2feb8fc0e7"}
album: Italian Mandolin IV
  type: MusicAlbum
  date published: 2007-07-25
album: 義大利曼陀林5
  type: MusicAlbum
  date published: 2007-07-25
album: 義大利曼陀林2
  type: MusicAlbum
  date published: 2007-07-25
album: 義大利曼陀林 III
  type: MusicAlbum
  date published: 2007-07-25