{
  "manageEntity": {
    "action": "Save",
    "entityId": "163915",
    "entityType": "Track",
    "nonce": "0x6dc6d7917b63ff83a86e9b651658fba04cf47f4f637d275f74355f5aed8be941",
    "signature": "0x03169b5983cbf2a6fd9d1385270409a080c301d648ef837668f101f908865f3e674d53ae6728559033e6ac504fc375eac8a8ac255bc534c060174ac152b9abe01b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}