{
  "manageEntity": {
    "action": "Save",
    "entityId": "1384818964",
    "entityType": "Track",
    "nonce": "0xe1e9798c5c92599af5f2a41f51e7f692e6e291428a44878f923a41d913827a85",
    "signature": "0xe3802dc8b76940d4b6b0547b6cee03e1324d479e90bc3032302ef3009083b5c867ee93f13762ef46b40a4851706dac1ad371976d9c62422d5f38881b40e85cec1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}