Why are you saying to put your "Key" in the memo field?
I originally thought you were trying to scam people, but it appears you've just selected a bad choice of words. IMHO, you should change the word "key" to "phrase" or something like that so people aren't entering in their keys into the memo field. I will remove my downvote if you make this change. Thanks!
English is not my native language, sorry about that. Words changed.