For example, several popular wallets warn a user if they are about to send funds to a Hive account that is very close to the name of an exchange or payment service, to prevent a user from mistyping and sending the funds to the wrong place. As a side note, most exchange wallets do not provide this service, so be extra careful when sending funds from an exchange.
It's only tangentially related to this topic but I think Hive UI's should move towards selecting names from lists (eg. following list, list of exchanges) and only as a last resort should users ever type someone's account name for a transfer (if it's on none of their lists). One-character typos are just too damn common and usernames don't have checksums, and it's as easy to do with a large sum as a small one.
It is reasonably closely related, since I think one of the most important functions of the blacklists is to warn people about transfers that might cause them to lose funds.
I've been considering a similar idea for a while for the wallet functionality. For the fiat money transmission sites I use, I have to first setup specific "beneficiary" accounts, and only then can I make transfers by selecting from such a list.
I think a similar function would be useful in the UI, such that when the user types an account name he has never sent to before, it would warn him that he has never sent to it before, and ask them if they want to do the transfer. This prompt could also ask if the user wants it to be added to a list of "commonly used" accounts that would show up as a dropdown below the edit box (which would be filtered as the user typed characters).
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