Sometimes the  characters could be Offline bitcoin wallet mistakenly read for another letter, such as a b versus an 8 or 1 versus l. If even a single character is wrong or mistakenly typed then the entire private key will be invalid. Private keys in wif format have a checksum but there are no tools for regular users to correct mistakes.

A bitcoin address is a string of characters that makes the account uniquely identifiable. These addresses each have characters and start with either ‘1’,’3’, or ‘bc1’. It’s a little more complicated, but you can get surprisingly far with voucher websites and bitcoins.

The best way to do this  is to disable all wi-fi, cellular, and bluetooth connections. The goal is to eliminate any chance of remote monitoring during the paper wallet creation process. Now, even if someone gets to your paper wallet and steals your private key, he/she cannot use it because the private key will only be unlocked using the passphrase. The process literally takes 30 seconds and you have your own paper wallet.

Take whatever precautions necessary to ensure it stays safe until needed. Since then, he has assisted over 100 companies in a variety of domains, including e-commerce, blockchain, cybersecurity, online marketing, and a lot more. In his free time, he likes playing games on his xbox and scrolling through quora.

A more private solution is to import the private key into bitcoin-qt and rescan. Nobody watching the bitcoin-qt full node from outside will be able to tell which address it's interested in because all the scanning happens locally on disk. Unfortunately rescanning is not scalable and so is very slow; therefore most users are pushed towards using public blockchain explorers or electrum servers. These centralized services can spy on the user and learn exactly how many bitcoins they have and where they spend them. Almost all wallet software today especially smartphone wallets relies on centralized lookups when redeeming paper wallets.