Perhaps we can talk to him to get our coin back and/or find out why his/her address would be the place to send coin in a hack attack?
The interesting thing is he has lost the password, and it is not feasible to brute force it.
So, even if he agrees to pay you back, he can't.
Thank you for answering me. If I know that I probably put 10 characters with a capital letter at the beginning and 2 number at the end without knowing what it was, I have a chance to find the password with a script?
1 capital letter == 26^1 == 26
2 digits == 10^2 == 100
7 mixed case == 52^7 == 1028071702528
26 * 100 * 1028071702528 == 2672986426572800
2672986426572800 passwords / 10 passwords per second == 8,470,364 years