KATANAGARI
type: MusicGroup
genre: kayokyoku
popularity: 14
followers: 111
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x76fb9fe834da4f1b9fbf01439c806dcdb092db7b50b336d04e7cb66e5a5719de
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953803
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953803
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e9588ab1-66fa-41d7-b9f4-8e9ec5d5d809.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e9588ab1-66fa-41d7-b9f4-8e9ec5d5d809.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/e9588ab1-66fa-41d7-b9f4-8e9ec5d5d809
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T15:41:00Z
additional property: OTSCanonicalRecord
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fb9fe834da4f1b9fbf01439c806dcdb092db7b50b336d04e7cb66e5a5719de. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9588ab1-66fa-41d7-b9f4-8e9ec5d5d809.json and https://artists.proofprofile.net/proofs/artist/e9588ab1-66fa-41d7-b9f4-8e9ec5d5d809.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T19:59:56Z
album: HITORIGURASHI
  type: MusicAlbum
  date published: 2017-10-13
album: INAKA
  type: MusicAlbum
  date published: 2017-11-22
album: クリスマスソング by 刀狩
  type: MusicAlbum
  date published: 2017-12-08
album: ダイエット
  type: MusicAlbum
  date published: 2018-02-16
album: 離婚
  type: MusicAlbum
  date published: 2018-04-20
album: テレビ
  type: MusicAlbum
  date published: 2018-12-29
album: アルコール
  type: MusicAlbum
  date published: 2018-12-29
album: COVERS
  type: MusicAlbum
  date published: 2019-11-29
album: 初
  type: MusicAlbum
  date published: 2020-04-03
album: 新
  type: MusicAlbum
  date published: 2020-04-03
album: COVERS2
  type: MusicAlbum
  date published: 2020-04-03
album: COVERS3
  type: MusicAlbum
  date published: 2020-04-24
  track: 愛なんだ
    type: MusicRecording
    duration: PT4M57S
    duration ms: 297399
    explicit: false
    by artist: KATANAGARI
    in album: COVERS3
      type: MusicAlbum
      date published: 2020-04-24
    genre: kayokyoku
    isrc code: JPJ592000919
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-16T04:39:24+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xf331656c6294370991c4139e31dd44c447ca37bd51e0ebc7a400b16d3450d187
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958245
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958245
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPJ592000919
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-16T07:42:44Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf331656c6294370991c4139e31dd44c447ca37bd51e0ebc7a400b16d3450d187. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:42:44Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPJ592000919.
      date published: 2026-07-16T07:42:44Z
    audio: 愛なんだ
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 121.039
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.584
      additional property: Energy
        type: PropertyValue
        value: 0.802
      additional property: Speechiness
        type: PropertyValue
        value: 0.04
      additional property: Acousticness
        type: PropertyValue
        value: 0.535
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.252
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.485
      additional property: Loudness (dB)
        type: PropertyValue
        value: -3.942
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: COVERS4
  type: MusicAlbum
  date published: 2020-12-04
album: COVERS5
  type: MusicAlbum
  date published: 2022-03-16
album: COVERS6
  type: MusicAlbum
  date published: 2022-03-23
album: COVERS8
  type: MusicAlbum
  date published: 2022-09-07
  track: どんないいこと
    type: MusicRecording
    duration: PT4M33S
    duration ms: 273068
    explicit: false
    by artist: KATANAGARI
    in album: COVERS8
      type: MusicAlbum
      date published: 2022-09-07
    genre: kayokyoku
    isrc code: JP92G2203838
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-15T12:13:26+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xb5b56816ac7e6e0f1f785277781273754f12a6a6606e388300fe5e41b17b38ef
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958157
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958157
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JP92G2203838
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-15T15:15:30Z
    additional property: OTSVerifyInstructions
    subject of: OpenTimestamps Proof of Existence
    audio: どんないいこと
album: COVERS9
album: COVERS10
album: COVERS11
album: COVERS12
album: COVERS13

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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b56816ac7e6e0f1f785277781273754f12a6a6606e388300fe5e41b17b38ef. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:15:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JP92G2203838.
date published: 2026-07-15T15:15:30Z

どんないいこと
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 176.112
additional property: Musical Key
  type: PropertyValue
  value: 9
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 1
additional property: Time Signature
  type: PropertyValue
  value: 4
additional property: Danceability
  type: PropertyValue
  value: 0.344
additional property: Energy
  type: PropertyValue
  value: 0.682
additional property: Speechiness
  type: PropertyValue
  value: 0.042
additional property: Acousticness
  type: PropertyValue
  value: 0.718
additional property: Instrumentalness
  type: PropertyValue
  value: 0
additional property: Liveness
  type: PropertyValue
  value: 0.247
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.682
additional property: Loudness (dB)
  type: PropertyValue
  value: -4.257
additional property: Key Name
  type: PropertyValue
  value: A
additional property: Mode Name
  type: PropertyValue
  value: Major

COVERS9
type: MusicAlbum
date published: 2023-04-19
track: ベスト・フレンド
  type: MusicRecording
  duration: PT3M56S
  duration ms: 236500
  explicit: false
  by artist: KATANAGARI
  in album: COVERS9
    type: MusicAlbum
    date published: 2023-04-19
  genre: kayokyoku
  isrc code: JP92G2301544
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-19T20:00:25+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xf502d9c4831b89d28a9b5c2b4b5f2a196fbb2008523d02588804bc7e1799f0ee
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 958776
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/958776
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JP92G2301544
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-19T20:11:59Z
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf502d9c4831b89d28a9b5c2b4b5f2a196fbb2008523d02588804bc7e1799f0ee. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JP92G2301544.
    date published: 2026-07-19T20:11:59Z
  audio: ベスト・フレンド
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 79.989
    additional property: Musical Key
      type: PropertyValue
      value: 5
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.612
    additional property: Energy
      type: PropertyValue
      value: 0.528
    additional property: Speechiness
      type: PropertyValue
      value: 0.024
    additional property: Acousticness
      type: PropertyValue
      value: 0.577
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.169
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.454
    additional property: Loudness (dB)
      type: PropertyValue
      value: -3.568
    additional property: Key Name
      type: PropertyValue
      value: F
    additional property: Mode Name
      type: PropertyValue
      value: Major

COVERS10
type: MusicAlbum
date published: 2023-08-24

COVERS11
type: MusicAlbum
date published: 2024-02-14

COVERS12
type: MusicAlbum
date published: 2025-06-04

COVERS13
type: MusicAlbum
date published: 2025-06-04