Kミュージックカンパニー
type: MusicGroup
genre: classical piano
popularity: 3
followers: 29
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x211cfc0a8285a41abc9c7f5e425e2d2de44644cc972f123c0f6ff1393e6828f9
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954667
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954667
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/dfb86caa-6ba4-44da-a6df-fd570d41c6a7.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/dfb86caa-6ba4-44da-a6df-fd570d41c6a7.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/dfb86caa-6ba4-44da-a6df-fd570d41c6a7
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x211cfc0a8285a41abc9c7f5e425e2d2de44644cc972f123c0f6ff1393e6828f9","name":"Kミュージックカンパニー","registered_at":"2026-06-21T06:13:15Z","symbol":"NIM1844903","token_address":"0xa69ea2697b75311ee5fcfaed33306030fd74f10e","type":"artist","uuid":"dfb86caa-6ba4-44da-a6df-fd570d41c6a7"}
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 0x211cfc0a8285a41abc9c7f5e425e2d2de44644cc972f123c0f6ff1393e6828f9. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dfb86caa-6ba4-44da-a6df-fd570d41c6a7.json and https://artists.proofprofile.net/proofs/artist/dfb86caa-6ba4-44da-a6df-fd570d41c6a7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0x211cfc0a8285a41abc9c7f5e425e2d2de44644cc972f123c0f6ff1393e6828f9","name":"Kミュージックカンパニー","registered_at":"2026-06-21T06:13:15Z","symbol":"NIM1844903","token_address":"0xa69ea2697b75311ee5fcfaed33306030fd74f10e","type":"artist","uuid":"dfb86caa-6ba4-44da-a6df-fd570d41c6a7"}
album: KMC Viola Sound Track Vol.1
  type: MusicAlbum
  date published: 2018-12-11
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  type: MusicAlbum
  date published: 2019-01-21
album: KMC Clarinet Sound
  type: MusicAlbum
  date published: 2019-03-19
album: ピアノソロ
  type: MusicAlbum
  date published: 2019-06-12
album: 日本の歌・世界の歌
  type: MusicAlbum
  date published: 2019-06-26
album: 声楽・ソプラノ・歌曲
  type: MusicAlbum
  date published: 2019-10-29
album: Jazz Horn
  type: MusicAlbum
  date published: 2020-05-31