foreach $host (keys %localDigest) {
  foreach $file (keys %{ $localDigest{$host} }) {
     if (exists $remoteDigest{$host}{$file}) {
       # replace with compare
       print "$localDigest{$host}{$file} = $remoteDigest{$host}{$file}
+\n";
     }
     else {
        print "file $host $file missing\n";
     }
  }
}
[download]

isn't it possible to compare your files,host and checksum in your original foreach loop, instead of building this complex hash structure?

MP