{
  "manageEntity": {
    "action": "Save",
    "entityId": "1389959775",
    "entityType": "Track",
    "nonce": "0x8ac0034fac89437776a11a4d9b0c70bcb1f6c4172dc1fc16ffbfd34144280ca9",
    "signature": "0x961114b4672539cf746f435a82d9f62d526a9827092feec0dffdc768eb32d1733641c62a018485ff7f9e35207ed9977c0c088246457cf1a80d1a736b3b91b72f1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}