Koji Maruyama
type: MusicGroup
genre: japanese classical
popularity: 5
followers: 277
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xbf607a4287b11b04d9e58864f4fc8590be6bc949f9ae841aa3d4230066a7a4ae
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953885
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953885
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0bbe5f23-453a-458c-870c-435d02859637.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0bbe5f23-453a-458c-870c-435d02859637.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/0bbe5f23-453a-458c-870c-435d02859637
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T04:12:47Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xbf607a4287b11b04d9e58864f4fc8590be6bc949f9ae841aa3d4230066a7a4ae","name":"Koji Maruyama","registered_at":"2026-06-15T17:39:22Z","symbol":"NIM0782575","token_address":"0x46aff77c50fec4e13c433b9d7a52cb7b9763f518","type":"artist","uuid":"0bbe5f23-453a-458c-870c-435d02859637"}
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 0xbf607a4287b11b04d9e58864f4fc8590be6bc949f9ae841aa3d4230066a7a4ae. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0bbe5f23-453a-458c-870c-435d02859637.json and https://artists.proofprofile.net/proofs/artist/0bbe5f23-453a-458c-870c-435d02859637.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T04:12:47Z
  text: {"copyright_id":"0xbf607a4287b11b04d9e58864f4fc8590be6bc949f9ae841aa3d4230066a7a4ae","name":"Koji Maruyama","registered_at":"2026-06-15T17:39:22Z","symbol":"NIM0782575","token_address":"0x46aff77c50fec4e13c433b9d7a52cb7b9763f518","type":"artist","uuid":"0bbe5f23-453a-458c-870c-435d02859637"}
album: cradle
  type: MusicAlbum
  date published: 2020-10-21
album: cradle
  type: MusicAlbum
  date published: 2020-10-21
album: cyanos
  type: MusicAlbum
  date published: 2021-02-24
album: cyanos
  type: MusicAlbum
  date published: 2021-02-24
album: eyes
  type: MusicAlbum
  date published: 2023-12-06
album: Lisianthus
  type: MusicAlbum
  date published: 2024-07-24
album: Lisianthus
  type: MusicAlbum
  date published: 2024-07-24
  track: eyes
    type: MusicRecording
    duration: PT3M18S
    duration ms: 198149
    explicit: false
    by artist: Koji Maruyama
    in album: Lisianthus
      type: MusicAlbum
      date published: 2024-07-24
    genre: japanese classical
    isrc code: TCJPA2480600
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-06T06:06:29+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x5bc16d560acb7eb0f5001f2e3edcdc8b02406de5b6679706bf2a832e048622f8
    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/TCJPA2480600
    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
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc16d560acb7eb0f5001f2e3edcdc8b02406de5b6679706bf2a832e048622f8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCJPA2480600.
      date published: 2026-07-06T06:56:49Z
    audio: eyes
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 152.104
      additional property: Musical Key
        type: PropertyValue
        value: 6
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 3
      additional property: Danceability
        type: PropertyValue
        value: 0.445
      additional property: Energy
        type: PropertyValue
        value: 0.33
      additional property: Speechiness
        type: PropertyValue
        value: 0.029
      additional property: Acousticness
        type: PropertyValue
        value: 0.898
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.932
      additional property: Liveness
        type: PropertyValue
        value: 0.106
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.257
      additional property: Loudness (dB)
        type: PropertyValue
        value: -12.54
      additional property: Key Name
        type: PropertyValue
        value: F#
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: ponder
  type: MusicAlbum
  date published: 2025-05-07
album: ponder
  type: MusicAlbum
  date published: 2025-05-07
  track: ponder
    type: MusicRecording
    duration: PT4M1S
    duration ms: 241505
    explicit: false
    by artist: Koji Maruyama
    in album: ponder
      type: MusicAlbum
      date published: 2025-05-07
    genre: japanese classical
    isrc code: TCJPG2513106
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-20T05:28:37+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x980a29acdedaa1b8b952cff73669e0e2a4cf253b737d279796e991c13e61d0d0
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958832
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958832
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPG2513106
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T05:43:55Z
    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 0x980a29acdedaa1b8b952cff73669e0e2a4cf253b737d279796e991c13e61d0d0. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/TCJPG2513106.
      date published: 2026-07-20T05:43:55Z
    audio: ponder
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 105.442
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
      additional property: Danceability
      additional property: Energy
      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

Time Signature
type: PropertyValue
value: 3

Danceability
type: PropertyValue
value: 0.48

Energy
type: PropertyValue
value: 0.028

Speechiness
type: PropertyValue
value: 0.058

Acousticness
type: PropertyValue
value: 0.995

Instrumentalness
type: PropertyValue
value: 0.916

Liveness
type: PropertyValue
value: 0.1

Valence (Positivity)
type: PropertyValue
value: 0.064

Loudness (dB)
type: PropertyValue
value: -26.682

Key Name
type: PropertyValue
value: C

Mode Name
type: PropertyValue
value: Major