Back in the dark ages new students to programming often wrote a "Hello World" program as there first exercise. I wonder if that is still the practice today? Shown below is my "Hello World" program using some of my favorite Linux commands such as sed, awk and tr. I thought about using grep too, but I just stuck with sed. If you have access to Linux you should be able to cut and paste right into your shell. If not, then decoding by hand should be fairly straight forward.
#################################################################################
echo "Hello World" | \
awk -F '' '{ for (i = NF; i > 0; --i) { printf("%s", $i) } }' | \
od -An -t uC | tr ' ' '\n' | sed '/^$/d'| \
awk 'BEGIN {
split("95:103:107:105:83:0:106:106:105:95:65:46", offset, ":")
i = 0
}
{
if ((i == 2) || (i == 8)) { print "." }
print $1 - offset[++i]
}' | \
sed 's/^32/ /' | tr -d '\n'
#################################################################################

You can validate your puzzle solution with certitude.
Congrats to TinSparrow for the FTF!
Additional Waypoints