{
  "manageEntity": {
    "action": "Save",
    "entityId": "411505",
    "entityType": "Track",
    "nonce": "0x40d83fc05658eadd9477efdaf5f08bd12481cb86bfb38e3e55e0e059074bb723",
    "signature": "0x08964809581514560aa62e9f5fefc031b95864853f7b9c3ba6ae4f6d08303cd04c590b05089fa712ca9529d2065ffeb6b1f0626f405e8a9a0c2e138a3418cb171b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}