One could skip the checksum part and just brute force the 4 missing bits on a hardware wallet and this way eliminate the need for a PC/smartphone.
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One could skip the checksum part and just brute force the 4 missing bits on a hardware wallet and this way eliminate the need for a PC/smartphone.
Ultimately the point was to show exactly how it works and why many combinations will throw an error.
However the brute force option is definitely a good one.
The fact that the last word only contains 7 bits of entropy (128 options vs 2048) means it's okay to pick any valid word you want and that choice will still be random enough for security purposes.
At the same time the entire point of this exercise was to avoid using a device that ever communicates with the outside world. This would imply that you should never use that hardware wallet ever again... and what happens when you actually want to move the funds?
If I happen to follow this up it will be to show how we can create a public signed operation by hand and broadcast it to the network by using nothing but a pen and paper for the airgap. I've actually already performed such a feat on hive when I changed my recovery account after the hostile takeover. It's actually a lot easier than it sounds but copying a signature by hand is rather tedious.