川西拓実、桜田ひより
type: MusicGroup
popularity: 3
followers: 9
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xed6eca67d3bd26d348fb9dbc09a2b219d604b075721b2ee5115b0ac00547e871
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954603
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954603
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c07307c7-fa07-4251-bafc-81f3f7ca2959.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c07307c7-fa07-4251-bafc-81f3f7ca2959.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/c07307c7-fa07-4251-bafc-81f3f7ca2959
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T21:47:54Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xed6eca67d3bd26d348fb9dbc09a2b219d604b075721b2ee5115b0ac00547e871","name":"川西拓実、桜田ひより","registered_at":"2026-06-20T19:20:10Z","symbol":"NIM1688579","token_address":"0x86fb957e410270b631c4dfa8247f33b6254c2c9b","type":"artist","uuid":"c07307c7-fa07-4251-bafc-81f3f7ca2959"}
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 0xed6eca67d3bd26d348fb9dbc09a2b219d604b075721b2ee5115b0ac00547e871. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c07307c7-fa07-4251-bafc-81f3f7ca2959.json and https://artists.proofprofile.net/proofs/artist/c07307c7-fa07-4251-bafc-81f3f7ca2959.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T21:47:54Z
  text: {"copyright_id":"0xed6eca67d3bd26d348fb9dbc09a2b219d604b075721b2ee5115b0ac00547e871","name":"川西拓実、桜田ひより","registered_at":"2026-06-20T19:20:10Z","symbol":"NIM1688579","token_address":"0x86fb957e410270b631c4dfa8247f33b6254c2c9b","type":"artist","uuid":"c07307c7-fa07-4251-bafc-81f3f7ca2959"}
album: Talk：川西拓実、桜田ひより
  type: MusicAlbum
  date published: 2024-04-15