msg.gm

{
  "name": "unreact",
  "base": "",
  "fields": [
    {
      "name": "sender",
      "type": "name"
    },
    {
      "name": "channel",
      "type": "name"
    },
    {
      "name": "seq",
      "type": "uint64"
    },
    {
      "name": "content",
      "type": "string"
    }
  ]
}