{
  "manageEntity": {
    "action": "Save",
    "entityId": "493213",
    "entityType": "Track",
    "nonce": "0xd1ca50f33c04b1ccad632724702ea5f6f734cb68dee9d3cdffda86301ab4cea8",
    "signature": "0xfe0a6f5b14d99494e5fa783295a2776aeefb7c7f489246a7ca5bf5d7c5caa41320b59bc0405f2b739ffac46d468ec7f19e50ce096227475755f1221c0c44bb6c1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}