{
  "manageEntity": {
    "action": "Save",
    "entityId": "1397568179",
    "entityType": "Track",
    "nonce": "0x4d2649647d7d3ab1bbc46bcce3ec72268414b11944b459c475fee3b288283f0a",
    "signature": "0xa0a9ca4645e202b2b3af638808ed8cea4de0fe10bd0c50e49a47d8f2648ca5821d04876fc6a9c6731f3b054301ce42d5f8f5e8ffbb11efa18ddc4aa2a99ac1491b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}