Kai Ichinose
type: MusicGroup
popularity: 26
followers: 3366
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x28c8462889d5b4c47798d51fb2e6fd6c69265caf5c8b3de274effd55d0f3c7c1
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953407
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953407
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/4d8df5c4-379d-4392-af76-d3eb47a6d5d8.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/4d8df5c4-379d-4392-af76-d3eb47a6d5d8.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/4d8df5c4-379d-4392-af76-d3eb47a6d5d8
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-12T19:24:56Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x28c8462889d5b4c47798d51fb2e6fd6c69265caf5c8b3de274effd55d0f3c7c1","name":"Kai Ichinose","registered_at":"2026-06-11T19:33:25Z","symbol":"NIM0101458","token_address":"0x77fa8b69c958e5e3caf3b7c4a8695736cac057cc","type":"artist","uuid":"4d8df5c4-379d-4392-af76-d3eb47a6d5d8"}
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 0x28c8462889d5b4c47798d51fb2e6fd6c69265caf5c8b3de274effd55d0f3c7c1. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4d8df5c4-379d-4392-af76-d3eb47a6d5d8.json and https://artists.proofprofile.net/proofs/artist/4d8df5c4-379d-4392-af76-d3eb47a6d5d8.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-12T19:24:56Z
  text: {"copyright_id":"0x28c8462889d5b4c47798d51fb2e6fd6c69265caf5c8b3de274effd55d0f3c7c1","name":"Kai Ichinose","registered_at":"2026-06-11T19:33:25Z","symbol":"NIM0101458","token_address":"0x77fa8b69c958e5e3caf3b7c4a8695736cac057cc","type":"artist","uuid":"4d8df5c4-379d-4392-af76-d3eb47a6d5d8"}
album: TVアニメ「ピアノの森」 Piano Selection I ショパン: エチュード ハ長調 作品10-1
  type: MusicAlbum
  date published: 2018-04-09
album: TVアニメ「ピアノの森」 Piano Selection IV モーツァルト: ピアノ・ソナタ第2番 ヘ長調 K. 280 〜第1楽章
  type: MusicAlbum
  date published: 2018-04-30
  track: TVアニメ「ピアノの森」 Piano Selection IV モーツァルト: ピアノ・ソナタ第2番 ヘ長調 K. 280 〜第1楽章
    type: MusicRecording
    duration: PT3M26S
    duration ms: 206935
    explicit: false
    by artist: Kai Ichinose
    in album: TVアニメ「ピアノの森」 Piano Selection IV モーツァルト: ピアノ・ソナタ第2番 ヘ長調 K. 280 〜第1楽章
      type: MusicAlbum
      date published: 2018-04-30
    isrc code: JPCO01806770
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-04T08:11:05+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xabc77e4b75c0c143225efd34040b8604dc91d34f5661a7c922f1fcf667b525cb
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956639
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956639
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01806770
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-04T11:19:20Z
    additional property: OTSVerifyInstructions
      type: PropertyValue
      value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xabc77e4b75c0c143225efd34040b8604dc91d34f5661a7c922f1fcf667b525cb. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01806770 — a six-check JSON result.
      date published: 2026-07-04T11:19:20Z
    audio: TVアニメ「ピアノの森」 Piano Selection IV モーツァルト: ピアノ・ソナタ第2番 ヘ長調 K. 280 〜第1楽章
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 136.02
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 3
      additional property: Danceability
        type: PropertyValue
        value: 0.338
      additional property: Energy
        type: PropertyValue
        value: 0.113
      additional property: Speechiness
        type: PropertyValue
        value: 0.039
      additional property: Acousticness
        type: PropertyValue
        value: 0.99
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.954
      additional property: Liveness
        type: PropertyValue
        value: 0.114
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.623
      additional property: Loudness (dB)
        type: PropertyValue
        value: -25.226
      additional property: Key Name
        type: PropertyValue
        value: F
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: TVアニメ「ピアノの森」 Piano Selection V 海ヘ (TVアニメ「ピアノの森」オープニングテーマ)
  type: MusicAlbum
  date published: 2018-05-07
album: To the Sea ~ Opening Theme (Tv Animation "Piano No Mori" Piano Selection V)
  type: MusicAlbum
  date published: 2018-05-07
album: TVアニメ「ピアノの森」 Piano Selection VII リスト: 「ラ・カンパネラ」〜パガニーニ大練習曲集 第3曲
  type: MusicAlbum
  date published: 2018-05-21
album: Beethoven: Piano Sonata Nr. 14 Op. 27 Nr. 2 Cis-Moll "Quasi Una Fantasia" (arrange Version) (Tv Animation "Piano No Mori" Piano Selection VIII)
  type: MusicAlbum
  date published: 2018-05-28
album: TVアニメ「ピアノの森」 Piano Selection VIII ベートーヴェン: ピアノ・ソナタ第14番 嬰ハ短調 作品27-2「月光」 〜第3楽章 (アレンジ・バージョン)
  type: MusicAlbum
  date published: 2018-05-28
  track: TVアニメ「ピアノの森」 Piano Selection VIII ベートーヴェン: ピアノ・ソナタ第14番 嬰ハ短調 作品27-2「月光」 〜第3楽章 (アレンジ・バージョン)
    type: MusicRecording
    duration: PT5M53S
    duration ms: 353353
    explicit: false
    by artist: Kai Ichinose
    in album: TVアニメ「ピアノの森」 Piano Selection VIII ベートーヴェン: ピアノ・ソナタ第14番 嬰ハ短調 作品27-2「月光」 〜第3楽章 (アレンジ・バージョン)
      type: MusicAlbum
      date published: 2018-05-28
    isrc code: JPCO01811810
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-14T18:44:40+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x17c316fa704d8dd86500764fbd0f727488414af3ea2466a3b268ef501b22388e
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958045
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958045
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01811810
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-14T18:53:23Z
    additional property: OTSVerifyInstructions
      type: PropertyValue
      value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x17c316fa704d8dd86500764fbd0f727488414af3ea2466a3b268ef501b22388e. Chain 2 (Bitcoin): anchored in block 958045 (2026-07-14T18:53:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01811810 — a six-check JSON result.
      date published: 2026-07-14T18:53:23Z
    audio: TVアニメ「ピアノの森」 Piano Selection VIII ベートーヴェン: ピアノ・ソナタ第14番 嬰ハ短調 作品27-2「月光」 〜第3楽章 (アレンジ・バージョン)
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 80.553
      additional property: Musical Key
        type: PropertyValue
        value: 6
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.281
      additional property: Energy
        type: PropertyValue
        value: 0.274
      additional property: Speechiness
      additional property: Acousticness
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
album: TVアニメ「ピアノの森」 Piano Selection IX ショパン: エチュード ホ短調 作品25-5
album: TVアニメ「ピアノの森」 Piano Selection XII ショパン: ノクターン第3番 ロ長調 作品9-3
album: TVアニメ「ピアノの森」Piano Selection ショパン: ポロネーズ第6番 変イ長調 作品53 「英雄」
album: TVアニメ「ピアノの森」一ノ瀬 海 至高の世界
album: TVアニメ「ピアノの森」茶色の小瓶 (オーケストラver.)

Speechiness
type: PropertyValue
value: 0.045

Acousticness
type: PropertyValue
value: 0.98

Instrumentalness
type: PropertyValue
value: 0.918

Liveness
type: PropertyValue
value: 0.093

Valence (Positivity)
type: PropertyValue
value: 0.074

Loudness (dB)
type: PropertyValue
value: -14.985

Key Name
type: PropertyValue
value: F#

Mode Name
type: PropertyValue
value: Minor

TVアニメ「ピアノの森」 Piano Selection IX ショパン: エチュード ホ短調 作品25-5
type: MusicAlbum
date published: 2018-06-04
track: TVアニメ「ピアノの森」 Piano Selection IX ショパン: エチュード ホ短調 作品25-5
  type: MusicRecording
  duration: PT3M35S
  duration ms: 215485
  explicit: false
  by artist: Kai Ichinose
  in album: TVアニメ「ピアノの森」 Piano Selection IX ショパン: エチュード ホ短調 作品25-5
    type: MusicAlbum
    date published: 2018-06-04
  isrc code: JPCO01812510
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-04T21:20:05+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xecfa2b3a15ecfe746a7b61912525f24507e51f50ad48ee9ee577a8ce440decad
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 956725
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/956725
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01812510
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-05T01:12:41Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xecfa2b3a15ecfe746a7b61912525f24507e51f50ad48ee9ee577a8ce440decad. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01812510 — a six-check JSON result.
    date published: 2026-07-05T01:12:41Z
  audio: TVアニメ「ピアノの森」 Piano Selection IX ショパン: エチュード ホ短調 作品25-5
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 103.567
    additional property: Musical Key
      type: PropertyValue
      value: 4
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.39
    additional property: Energy
      type: PropertyValue
      value: 0.145
    additional property: Speechiness
      type: PropertyValue
      value: 0.041
    additional property: Acousticness
      type: PropertyValue
      value: 0.989
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.843
    additional property: Liveness
      type: PropertyValue
      value: 0.094
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.138
    additional property: Loudness (dB)
      type: PropertyValue
      value: -18.913
    additional property: Key Name
      type: PropertyValue
      value: E
    additional property: Mode Name
      type: PropertyValue
      value: Major

TVアニメ「ピアノの森」 Piano Selection XII ショパン: ノクターン第3番 ロ長調 作品9-3
type: MusicAlbum
date published: 2018-07-02

TVアニメ「ピアノの森」Piano Selection ショパン: ポロネーズ第6番 変イ長調 作品53 「英雄」
type: MusicAlbum
date published: 2019-02-25

TVアニメ「ピアノの森」一ノ瀬 海 至高の世界
type: MusicAlbum
date published: 2019-03-20
track: マズルカ 作品50 第1曲 ト長調
  type: MusicRecording
  duration: PT2M28S
  duration ms: 148066
  explicit: false
  by artist: Kai Ichinose
  in album: TVアニメ「ピアノの森」一ノ瀬 海 至高の世界
    type: MusicAlbum
    date published: 2019-03-20
  isrc code: JPCO01904520
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-03T13:13:17+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x37a32a9efed84edd30f5b7a3f9f5ba919fcb5310b89b7c1536ec413a277dcbb4
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 956545
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/956545
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01904520
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-03T19:59:51Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x37a32a9efed84edd30f5b7a3f9f5ba919fcb5310b89b7c1536ec413a277dcbb4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01904520 — a six-check JSON result.
    date published: 2026-07-03T19:59:51Z
  audio: マズルカ 作品50 第1曲 ト長調
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 85.172
    additional property: Musical Key
      type: PropertyValue
      value: 7
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.322
    additional property: Energy
      type: PropertyValue
      value: 0.044
    additional property: Speechiness
      type: PropertyValue
      value: 0.034
    additional property: Acousticness
      type: PropertyValue
      value: 0.995
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.902
    additional property: Liveness
      type: PropertyValue
      value: 0.139
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.213
    additional property: Loudness (dB)
      type: PropertyValue
      value: -23.869
    additional property: Key Name
      type: PropertyValue
      value: G
    additional property: Mode Name
      type: PropertyValue
      value: Major
track: 「葬送曲」 〜詩的で宗教的な調べ 第7曲
  type: MusicRecording
  duration: PT13M35S
  duration ms: 815640
  explicit: false
  by artist: Kai Ichinose
  in album: TVアニメ「ピアノの森」一ノ瀬 海 至高の世界
    type: MusicAlbum
    date published: 2019-03-20
  isrc code: JPCO01904470
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-06T02:05:15+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x9f60bcd677ef9ea4660af6a1bbc311e2586b8c2df21bec118054cb6846d33a74
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 956889
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/956889
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01904470
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-06T06:56:49Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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
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    date published: 2026-07-06T06:56:49Z
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  audio: ピアノ協奏曲 第1番 ホ短調 作品11 第1楽章
track: エチュード ハ長調 作品10-1
track: ピアノ協奏曲 第1番 ホ短調 作品11 第3楽章
track: プレリュード ニ短調 作品28-24
track: ピアノ・ソナタ 第3番 ロ短調 作品58 第1楽章
track: ピアノ・ソナタ 第3番 ロ短調 作品58 第2楽章
track: ピアノ・ソナタ 第3番 ロ短調 作品58 第4楽章

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OpenTimestamps Proof of Existence
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date published: 2026-07-05T10:01:46Z

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エチュード ハ長調 作品10-1
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-19T00:50:09Z
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ピアノ協奏曲 第1番 ホ短調 作品11 第3楽章
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-15T06:57:12Z
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プレリュード ニ短調 作品28-24
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-16T05:50:22Z
audio: プレリュード ニ短調 作品28-24
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ピアノ・ソナタ 第3番 ロ短調 作品58 第1楽章
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-20T00:01:46Z
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ピアノ・ソナタ 第3番 ロ短調 作品58 第2楽章
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-22T12:33:25Z
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ピアノ・ソナタ 第3番 ロ短調 作品58 第4楽章
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TVアニメ「ピアノの森」茶色の小瓶 (オーケストラver.)
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