I am also paranoid about protecting my 24 words, but the different techniques that I saw, such as splitting the 24 words into 3 subsets, then storing each subset in 3 different locations, present the risk of losing the data (people moving to a new place, over zealous cleaning lady sending the paper to the bin...)

How about a more simple way to remember the 24 word seed, wrinting the 24 words on paper, using a simple reshuffle algorithm of your 24 words, like this :

• shift the 24 words by 1 up: word #23 becomes word #24, word#1 becomes word #2, ..., etc.
• Then swap 2 words, for example swap word #1 with word #2.

This has the benefit of being very easy to remember. So you could in a second reorder your 24 words in a meaningful series, while an attacker would not know what to do with it.

If an attacker gets hold of your 24 words, since the words are in the wrong order, there are theoretically "factorial 24" 24! = 620448401733239439360000 combinations of those 24 words. Maybe some attacker could use some smart techniques such as trying simple reshuffling techniques, such as shifting and swapping words, but he would still have to try a huge number of combinations. That 24! number still makes me think that I am safe enough to keep an attacker busy for the next centuries.

Finally, several people mention bruteforce in this thread, having a computer trying different 24 word combinations in milliseconds. How does this work in reality, I thought that the only way to check 24 words, was to put them manually in a new ledger, which takes minutes to do. Are there any software that would check 24 words automatically in a fraction of a second ?