{
  "manageEntity": {
    "action": "Save",
    "entityId": "1629195022",
    "entityType": "Track",
    "nonce": "1786724889242769079",
    "signature": "0x39b197b2e6351988226626053b9124e74496aa58fbe922ddebb22fa455a973542a8917ba025aae413a284d5503d7133cb3c57498e5ea72b62838998e593c2e4d1b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}