{
  "manageEntity": {
    "action": "Save",
    "entityId": "1616035882",
    "entityType": "Track",
    "nonce": "0x2786ecd836629a499a4d7857aaef316015c120547dcc66322449bcc7b67f72ac",
    "signature": "0xbaa781e2871ea027b3980dd2f29177ade13d51e67d490cad3d05f24f9ad16d1704db25c9cf3eb62d70e3210dad7eff57a5a2be3ff2946ae855715ace0f25ede21b",
    "signer": "0x5Da8B4553216Faedf54f0B756f3d3BA7F6781A2a",
    "userId": "680517375"
  }
}