Hirokazu Ogura
type: MusicGroup
description: musician from Takamatsu. His interest in playing the guitar started in High School. He has worked as a professional artist since 1982 as a guitarist and as a sound producer. His list of contacts inc
popularity: 5
followers: 573
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xa91b83a3e152dea37bbe86e00845906435e9f7d23441e0e7d05b792302fed42a
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/85cc74e8-c50f-4efb-b3e0-e57331afc8da.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/85cc74e8-c50f-4efb-b3e0-e57331afc8da.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/85cc74e8-c50f-4efb-b3e0-e57331afc8da
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:22:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xa91b83a3e152dea37bbe86e00845906435e9f7d23441e0e7d05b792302fed42a","name":"Hirokazu Ogura","registered_at":"2026-06-17T12:20:51Z","symbol":"NIM1393767","token_address":"0xb66a78505c3c5c18d624ab8e6306aaf439aafd2c","type":"artist","uuid":"85cc74e8-c50f-4efb-b3e0-e57331afc8da"}
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91b83a3e152dea37bbe86e00845906435e9f7d23441e0e7d05b792302fed42a. 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/85cc74e8-c50f-4efb-b3e0-e57331afc8da.json and https://artists.proofprofile.net/proofs/artist/85cc74e8-c50f-4efb-b3e0-e57331afc8da.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
  text: {"copyright_id":"0xa91b83a3e152dea37bbe86e00845906435e9f7d23441e0e7d05b792302fed42a","name":"Hirokazu Ogura","registered_at":"2026-06-17T12:20:51Z","symbol":"NIM1393767","token_address":"0xb66a78505c3c5c18d624ab8e6306aaf439aafd2c","type":"artist","uuid":"85cc74e8-c50f-4efb-b3e0-e57331afc8da"}
album: GOLDEN TIME
  type: MusicAlbum
  date published: 2014-11-05
album: GOLDEN TIME
  type: MusicAlbum
  date published: 2014-11-05
album: Summer Guitars
  type: MusicAlbum
  date published: 2016-11-23