{
  "manageEntity": {
    "action": "Save",
    "entityId": "1944209714",
    "entityType": "Track",
    "nonce": "0x7a94c8b71e96048ae8cf37f82b15153d6dd481ed00485589a26693eaec2763df",
    "signature": "0x1b8e884a0556f921e9632215b31f7a4a687b4b5ee4b2c9fa51d1df2cb43ebc0302e2b1d4603c699f9f04de3661739be500254b98472f1189a9c72e19dcc42e731b",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}