Katsutoshi Nagasawa
type: MusicGroup
description: was a Japanese composer of classical music with a modern approach. Nagasawa composed for traditional Japanese musical instruments (e.g., Shakuhachi, Koto, Shamisen). Nagasawa was born in 1923 in To
popularity: 4
followers: 89
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additional property: OTSVerifyInstructions
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  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
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  date published: 2026-06-17T08:10:43Z
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album: Authentic Japan (Vinyl)
  type: MusicAlbum
  date published: 1986-06-30
  track: Fantasy of Waves - Remastered
    type: MusicRecording
    duration: PT2M17S
    duration ms: 137584
    explicit: false
    by artist: Katsutoshi Nagasawa
    in album: Authentic Japan (Vinyl)
      type: MusicAlbum
      date published: 1986-06-30
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    additional property: OTSTimestamp
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    additional property: OTSVerifyInstructions
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      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
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      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6751358cf421b375d5a7ff8a973f505c20edcc3c912f34a742fe16f3f9c55e4e. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEB632305726.
      date published: 2026-07-21T00:24:07Z
    audio: Fantasy of Waves - Remastered
      type: AudioObject
      additional property: Tempo (BPM)
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      additional property: Musical Key
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      additional property: Time Signature
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        value: 1
      additional property: Danceability
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      additional property: Energy
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      additional property: Speechiness
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      additional property: Acousticness
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      additional property: Instrumentalness
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      additional property: Liveness
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      additional property: Valence (Positivity)
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      additional property: Loudness (dB)
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        value: -13.378
      additional property: Key Name
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        value: G
      additional property: Mode Name
        type: PropertyValue
        value: Major