{
  "manageEntity": {
    "action": "Save",
    "entityId": "327453",
    "entityType": "Track",
    "nonce": "0xef3a93904ec8f55e646a539785303864625c8a01cd641d4714916a2aad94b199",
    "signature": "0xfd5fa918af594004820536df352481e725406db62122ea1d5748961c9825579f521ec557e845f805ff73e5131de5622adc704d31812c2b576f12a85c5e8187c21b",
    "signer": "0x2B28feb1CA15953a5a910C4E741698a24e8b3FE9",
    "userId": "887020893"
  }
}