{
  "manageEntity": {
    "action": "Save",
    "entityId": "586792597",
    "entityType": "Track",
    "nonce": "0x18a52a332cd500912d522a95f5471ce8cb1c946f0f16c97accde1da74a41b6b8",
    "signature": "0x5b5a85a76b7a290d54b5f2f41c30b9ae183bb10f4fbbb36d3b8ea6f1d1f2e99602e6aebe31f2c3d4e1e384b0daf1c6e68c063d30165380df92ae83152700c5271c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}