Player Piano
type: MusicGroup
genre: ragtime
description: thumb|A restored pneumatic player piano thumb|thumbtime=2:30|Steinway reproducing piano from 1920. Harold Bauer playing Saint-Saëns' Piano Concerto No. 2 in G minor, Op. 22, excerpt of 3rd movement. D
popularity: 8
followers: 387
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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: 2026-06-17T08:11:48Z
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album: All Time Favorites
  type: MusicAlbum
  date published: 1992
album: Big Band Hits
  type: MusicAlbum
  date published: 1993
album: Player Piano - Country Hits
  type: MusicAlbum
  date published: 1993-01-01
album: A Player Piano Christmas
  type: MusicAlbum
  date published: 1998
album: Player Piano - Ragtime
  type: MusicAlbum
  date published: 1998-01-01
  track: 12th Street Rag
    type: MusicRecording
    duration: PT3M43S
    duration ms: 223627
    explicit: false
    by artist: Player Piano
    in album: Player Piano - Ragtime
      type: MusicAlbum
      date published: 1998-01-01
    genre: ragtime
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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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      date published: 2026-07-05T01:12:41Z
    audio: 12th Street Rag
      type: AudioObject
      additional property: Tempo (BPM)
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        value: 112.666
      additional property: Musical Key
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        value: 8
      additional property: Mode (Major/Minor)
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        value: 1
      additional property: Time Signature
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        value: 4
      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
        type: PropertyValue
        value: 0.172
      additional property: Valence (Positivity)
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        value: 0.958
      additional property: Loudness (dB)
        type: PropertyValue
        value: -15.182
      additional property: Key Name
        type: PropertyValue
        value: Ab
      additional property: Mode Name
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        value: Major
album: Player Piano - 20's Hit Parade
  type: MusicAlbum
  date published: 1998-01-01
  track: Sweet Georgia Brown
    type: MusicRecording
    duration: PT4M6S
    duration ms: 246360
    explicit: false
    by artist: Player Piano
    in album: Player Piano - 20's Hit Parade
      type: MusicAlbum
      date published: 1998-01-01
    genre: ragtime
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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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      date published: 2026-07-19T15:36:35Z
    audio: Sweet Georgia Brown
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      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name

Energy
type: PropertyValue
value: 0.281

Speechiness
type: PropertyValue
value: 0.082

Acousticness
type: PropertyValue
value: 0.984

Instrumentalness
type: PropertyValue
value: 0.74

Liveness
type: PropertyValue
value: 0.21

Valence (Positivity)
type: PropertyValue
value: 0.867

Loudness (dB)
type: PropertyValue
value: -15.564

Key Name
type: PropertyValue
value: D

Mode Name
type: PropertyValue
value: Major