Considerations when building a cryptocurrency wallet

You have now created a desktop cryptocurrency wallet. However, this wallet is not yet complete. A cryptocurrency wallet is a vast topic that changes so often that a book could be written on this topic alone. There are other features you can implement into a cryptocurrency wallet application, such as how many blocks have been confirmed for this transaction. In our application, we only wait for one transaction, but some users may want to confirm a couple of blocks first. If the transaction is confirmed with only one block, there is a slight chance that it could be replaced with a longer block. However, after 12 blocks, the transaction in the block is pretty much secure and irreversible, as explained in the following link: https://ethereum.stackexchange.com/questions/319/what-number-of-confirmations-is-considered-secure-in-ethereum...