{
  "manageEntity": {
    "action": "Save",
    "entityId": "1016303733",
    "entityType": "Track",
    "nonce": "0x2fc95ddabf81cd84a70387007918b389abdb5958b51a85ed5eaeab34d05317a2",
    "signature": "0xe454212c74d707de6602994109892577151cf83f73e5353ceabd2ef79bf85e9515447c952caf3be466070b1c0dc861ce0fd5835725a766482fd94f1eb84873241b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}