Quote from: aysg76 on Today at 12:58:29 PM

Now if you say that you know only 6 words out of 12 then I would say it's near to impossible brute force and crack the rest of words because there are lot of possible combinations as you are missing 6 words out of it.See this answer where only one word is missing and we have so many possibilities so you are wrong on this part I would say.

There are many posts on the forum that explain how demanding (or rather expensive and time-consuming) everything that exceeds 4 words is - because @o_e_l_e_o explained it in one of his posts on the example of seed where someone needed about 30 hours for 4 words with note that he did not do it with his computer. Only 5 words would extend that same procedure to even 7 years.

Quote from: o_e_l_e_o on October 22, 2020, 07:57:43 PM

This person bruteforced 4 words: https://medium.com/@johncantrell97/how-i-checked-over-1-trillion-mnemonics-in-30-hours-to-win-a-bitcoin-635fe051a752
On his own computer it would have taken him 25 years. By spending $350 renting cloud computing he was able to do it in 30 hours. If you make that 5 words, rather than 4, then it would have cost him $350*2048 = $716,800 and would have taken him 30 hours*2048 = ~7 years.

I think 4 words is the limit of what could be called "easily" brute forced (and even then, it's not that easy). 5 words is potentially possibly, but only with a significant amount of time, money, and resources.

Also from the same thread, one interesting fact when it comes to 12 word seeds.

Quote from: o_e_l_e_o on October 22, 2020, 11:29:41 PM

Because there are this many possible valid 12 word seeds:
340,282,366,920,938,463,463,374,607,431,768,211,456

And there only approximately 30 million bitcoin addresses with balance on them. Divide those two numbers and you get a roughly 1 in 11 million trillion trillion chance of finding a collision. (Now, this is not quite accurate since any seed can generate potentially billions of addresses, but you get the idea.)