{
  "manageEntity": {
    "action": "Save",
    "entityId": "1003713",
    "entityType": "Track",
    "nonce": "0xe2dc3c44990d1caf1ddfeb03ee41440d9e3d99334c4f43d67613c1a43b3c2ed3",
    "signature": "0x38b2c56cf57c1b3db6e833b9e90459b081e091b92bf4e68d242180a69bb2a29a492a622e817df56bc272e63ec4cbf7d0f542e81546439a1171f8e4d20e32139f1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}