{
  "manageEntity": {
    "action": "Save",
    "entityId": "1904718683",
    "entityType": "Track",
    "nonce": "0xc56773c8d1c7e1ec94c2dbbc68efafed8db7091b7f53ee1a1d7672ba521fa8a2",
    "signature": "0x2bbfb6963a3f6b56c9c7e8bd94af7092d101d891fa8e9e55473b050eaec5a02c6a1252c5834a547edbae3264e2559e17918ee81180e7773b7a9e3b4cd5e43ff21c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}