virtualusers

{
  "name": "changepubkey",
  "base": "",
  "fields": [
    {
      "name": "old_key",
      "type": "public_key"
    },
    {
      "name": "new_key",
      "type": "public_key"
    },
    {
      "name": "transdata",
      "type": "checksum256"
    }
  ]
}