{
  "manageEntity": {
    "action": "Save",
    "entityId": "1409123390",
    "entityType": "Track",
    "nonce": "0xddd815d2389dbea93404ecd612f063bc9c88ade83e18f2048a7305cca7f15287",
    "signature": "0x88156282e609ff4ba709789ff8266873ddc9a7298b9ef10d1110675bb070bf446f8e8dcfde9d3077ccea3e7e78509ba7ab7fde00f5f297f18296269c95b04cc21b",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}