user131897: I lost my private key front 5 character can i gain back my private key my address is 1PfNh5fRcE9JKDmicD2Rh3pexGwce1LqyU  i didn't have any backup. If any one help me to get my private key back i will give you good Reward.

user128539: A private key in WIF format has a checksum of 4 bytes, and with that checksum you can check every possible key for a valid checksum.
I made a program do recover missing characters in a private key. Please note it is not fast because it is written in js, but it works and should be sufficient for 5 missing character.
https://github.com/antonilol/btc_stuff/blob/master/priv_key_recovery.js
with 6 or more chracters there can be multiple possible private keys. If that's the case you can remove process.exit(0); on line 22 (it exits the program after finding a key)

131897: <p>I lost my private key front 5 character can i gain back my private key my address is 1PfNh5fRcE9JKDmicD2Rh3pexGwce1LqyU  i didn't have any backup. If any one help me to get my private key back i will give you good Reward.</p>
 128539: <p>A private key in WIF format has a checksum of 4 bytes, and with that checksum you can check every possible key for a valid checksum.</p>
<p>I made a program do recover missing characters in a private key. Please note it is not fast because it is written in js, but it works and should be sufficient for 5 missing character.</p>
<p><a href="https://github.com/antonilol/btc_stuff/blob/master/priv_key_recovery.js" rel="nofollow noreferrer">https://github.com/antonilol/btc_stuff/blob/master/priv_key_recovery.js</a></p>
<p>with 6 or more chracters there can be multiple possible private keys. If that's the case you can remove <code>process.exit(0);</code> on line 22 (it exits the program after finding a key)</p>
