Tell me more: after stopping and restarting the program, it starts to sort through the keys again, or how is the previous search result saved?

Thank you for your help!!!

I don't currently have a file called KEYFOUNDKEYFOUND.txt
Will this file be created automatically when the private key is found?

Hello! Launched Keyhunt. Tell me, please, how can I understand that the key is found and where can I view it?
Sincerely!

$ ./keyhunt -m bsgs -f tests/125.txt -b 125 -R -k 256 -q -t 8 -s 10 -S

• Version 0.2.230507 Satoshi Quest, developed by AlbertoBSD
• Random mode
• K factor 256
• Quiet thread output
• Threads : 8
• Stats output every 10 seconds
• Mode BSGS random
• Opening file tests/125.txt
• Added 1 points from file
• Bit Range 125
• -- from : 0x10000000000000000000000000000000
• -- to   : 0x20000000000000000000000000000000
• N = 0x100000000000
• Bloom filter for 1073741824 elements : 3680.66 MB
• Bloom filter for 33554432 elements : 115.02 MB
• Bloom filter for 1048576 elements : 3.59 MB
• Allocating 16.00 MB for 1048576 bP Points
• processing 1073741824/1073741824 bP points : 100%     
• Making checkums .. ... done
• Sorting 1048576 elements... Done!
• Writing bloom filter to file keyhunt_bsgs_4_1073741824.blm .... Done!
• Writing bloom filter to file keyhunt_bsgs_6_33554432.blm .... Done!
• Writing bP Table to file keyhunt_bsgs_2_1048576.tbl .. Done!
• Writing bloom filter to file keyhunt_bsgs_7_1048576.blm .... Done!
• Total 187789848216885788672 keys in 8590 seconds: ~21 Pkeys/s (21861449152140371 keys/s)