{
  "manageEntity": {
    "action": "Save",
    "entityId": "493618",
    "entityType": "Track",
    "nonce": "0xfa0f9db55aa975db410a1c70423496954c2b686ce12031ee84376bf8ed7039aa",
    "signature": "0xb6c1cf490d0eb841b543894ae6842c9f845e2405d96ae1bb02342004e7b05fe329e497176cb3655f2c06a1e90c6d34bf7fe39d4201a1402c224dcc272115d4c21c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}