TETSURO KAWASHIMA QUARTET
type: MusicGroup
popularity: 2
followers: 288
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x8e971914fa5e9a58fb06dbddbba4a4ee60c6b9204776b3ce59dff6518ac9a853
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953889
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953889
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0d50e9a2-cd46-43ee-83d2-b484862c83db.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0d50e9a2-cd46-43ee-83d2-b484862c83db.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/0d50e9a2-cd46-43ee-83d2-b484862c83db
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T04:57:45Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x8e971914fa5e9a58fb06dbddbba4a4ee60c6b9204776b3ce59dff6518ac9a853","name":"TETSURO KAWASHIMA QUARTET","registered_at":"2026-06-15T18:07:24Z","symbol":"NIM0789250","token_address":"0x35d77ec01054c635dd19a1e9d6b0d8f9e958fef1","type":"artist","uuid":"0d50e9a2-cd46-43ee-83d2-b484862c83db"}
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 0x8e971914fa5e9a58fb06dbddbba4a4ee60c6b9204776b3ce59dff6518ac9a853. Chain 2 (Bitcoin): anchored in block 953889 (2026-06-16T04:57:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d50e9a2-cd46-43ee-83d2-b484862c83db.json and https://artists.proofprofile.net/proofs/artist/0d50e9a2-cd46-43ee-83d2-b484862c83db.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T04:57:45Z
  text: {"copyright_id":"0x8e971914fa5e9a58fb06dbddbba4a4ee60c6b9204776b3ce59dff6518ac9a853","name":"TETSURO KAWASHIMA QUARTET","registered_at":"2026-06-15T18:07:24Z","symbol":"NIM0789250","token_address":"0x35d77ec01054c635dd19a1e9d6b0d8f9e958fef1","type":"artist","uuid":"0d50e9a2-cd46-43ee-83d2-b484862c83db"}
album: 哀歌
  type: MusicAlbum
  date published: 2008-11-19
album: デイズ・オブ・バード
  type: MusicAlbum
  date published: 2010-09-29
album: ラメンテーション～ライブ・アット東京TUC～
  type: MusicAlbum
  date published: 2014-04-23
album: Lamentation (Live at Tokyo TUC)
  type: MusicAlbum
  date published: 2014-04-23
album: Soul Suite
  type: MusicAlbum
  date published: 2016-06-08
album: Soul Suite
  type: MusicAlbum
  date published: 2016-06-08