カタカナ英会話
type: MusicGroup
popularity: 3
followers: 770
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xdb990dfc10a55cc8f48d4b12969d772d68a42ac28b8ea9cdf9153ba76ca52926
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954689
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954689
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e197ced0-e59e-4d64-82b7-e12ea3ce2095.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e197ced0-e59e-4d64-82b7-e12ea3ce2095.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/e197ced0-e59e-4d64-82b7-e12ea3ce2095
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T10:35:31Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xdb990dfc10a55cc8f48d4b12969d772d68a42ac28b8ea9cdf9153ba76ca52926","name":"カタカナ英会話","registered_at":"2026-06-21T06:44:16Z","symbol":"NIM1851761","token_address":"0x69eaced67865293dab0ef95826e96b3fb6868487","type":"artist","uuid":"e197ced0-e59e-4d64-82b7-e12ea3ce2095"}
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 0xdb990dfc10a55cc8f48d4b12969d772d68a42ac28b8ea9cdf9153ba76ca52926. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e197ced0-e59e-4d64-82b7-e12ea3ce2095.json and https://artists.proofprofile.net/proofs/artist/e197ced0-e59e-4d64-82b7-e12ea3ce2095.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T10:35:31Z
  text: {"copyright_id":"0xdb990dfc10a55cc8f48d4b12969d772d68a42ac28b8ea9cdf9153ba76ca52926","name":"カタカナ英会話","registered_at":"2026-06-21T06:44:16Z","symbol":"NIM1851761","token_address":"0x69eaced67865293dab0ef95826e96b3fb6868487","type":"artist","uuid":"e197ced0-e59e-4d64-82b7-e12ea3ce2095"}
album: カタカナ英会話 Welcome Japan Vol.1
  type: MusicAlbum
  date published: 2016-07-25
album: カタカナ英会話 Welcome Japan Vol.2
  type: MusicAlbum
  date published: 2018-08-29
album: カタカナ英会話 Welcome Japan Vol.3
  type: MusicAlbum
  date published: 2018-08-29