{
  "manageEntity": {
    "action": "Save",
    "entityId": "503990386",
    "entityType": "Track",
    "nonce": "0x5f8f1f4bf05eaaf3ce28f19cbd4f3224da77e4604677305cb57d5d738e6759da",
    "signature": "0xbf240f0fee0c290ea7a98f42440b1d3dd24a7114930dc98c523059cb68c995ea210f6fd5290a8e13ebb935ffad99a3d9bb7fa0e486a725584911f2c60edf71781c",
    "signer": "0x036B1ee0d2003ae5B5E252d58647d13f0e588EEB",
    "userId": "161353174"
  }
}