{
  "manageEntity": {
    "action": "Save",
    "entityId": "66520",
    "entityType": "Track",
    "nonce": "0xec6744eff58ad6bab52e09e152e1e741d2975cdafa9cb4b2250b6b8199b53368",
    "signature": "0xc88e56751edfbdba1f9de75dfc7bb8fb00f085a6a4f5588e2de17569d8e417332355ef03db4ef9ab61051e648a0eab503cf3bc4a8011ee023228e721c04491e81c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}