{
  "manageEntity": {
    "action": "Save",
    "entityId": "604064083",
    "entityType": "Track",
    "nonce": "0xaf7a6657a56f11cd3c6269eed5a017966cb7996883394ed4c63cb6e9de3902a7",
    "signature": "0xe9ae3bd33cf6aa28546029d1b776b82af152eb891f5472c60933daf34f79004738e82fcdf343ba3641d8465c665b7e8c7951aa71ab571b936f5758312c869d2c1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}