{
      "name": "hashicorp/precise64",
      "description": "This box contains Ubuntu 12.04 LTS 64-bit.",
      "versions": [
        {
          "version": "0.1.0",
          "providers": [
            {
              "name": "virtualbox",
              "url": "http://somewhere.com/precise64_010_virtualbox.box",
              "checksum_type": "sha1",
---->         "checksum": "foo"
            }
          ]
        }
      ]
    }