Returns right away, with no response. Does not wait for CheckTx nor DeliverTx results.

{
  "jsonrpc": "2.0",
  "id": 0,
  "result": {
    "code": "0",
    "data": "",
    "log": "",
    "codespace": "ibc",
    "hash": "0D33F2F03A5234F38706E43004489E061AC40A2E"
  },
  "error": ""
}

{
  "id": 0,
  "jsonrpc": "2.0",
  "error": "Description of failure"
}