{fetchurl}:
fetchurl {
  url = "https://github.com/MilkBowl/Vault/releases/download/1.7.3/Vault.jar";
  sha256 = "a6b5ed97f43a5cf5bbaf00a7c8cd23c5afc9bd003f849875af8b36e6cf77d01d";
  name = "Vault.jar";
}