{
  "manageEntity": {
    "action": "Save",
    "entityId": "1408549283",
    "entityType": "Track",
    "nonce": "0xfffb7f479838a0d8591e81b885925bb7928c785e64fd5c1b159e524359424694",
    "signature": "0xedfb60df45837ecd6d95c9caaa0140ab691915eb09c535be39003dc2f3d7ff4738e4ff2573a903b8cc3c14089611ed204174a5c73254398124eb15fb956ff5e61b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}