This error is showing up immediately on FinderOuter.Thanks for your response. Wish you merry Xmas.
Then you are entering the wrong string in to FinderOuter. If it is showing up immediately, then it means FinderOuter is simply checking the string you have entered and telling you it has an incorrect checksum. It is not actually attempting to brute force any other possibilities.
Here's what you should be doing:
Open FinderOuter
Click on "Missing Base58"
Paste in your private key to the first box
Swap the invalid characters I and l for the missing char symbol (which is * by default)
Ensure the input type is "PrivateKey"
Click "Find" at the top
If it doesn't find your key, if you could then copy and paste here exactly what appears in the box at the bottom, that would be useful.
Thanks for your response. Wish you and all a very very happy New Year 2023. May year 2023 bring peace, prosperity and good health to all.
Regarding the invalid key which I have is as follows.
The result in FinderOuter is finished fail.
The key has checksum error along with several characters not at the right positions. It starts with 5 but the second character is F followed by other characters with two invalid Base 58 characters and checksum error which makes me understand that last four characters are not correct. So, in total the key has the atleast 7 characters wrong and could be more.
I am frustrated because I purchased Bitcoins via PayPal with my debit card in 2010/11 and least expected to be scammed on Bitcoins then because they were not worth even Pennies as of early days.
I tried to sweep key from the key produced by FinderOuter in Electrum but it results in No count
I feel the entire key is invalid.
If anybody can help me to get contact details of Blackschneider78 who has posted on this forum of having purchased Bitcoins in 2011, via email/PayPal, please do.
Appreciate your suggestions and advice.