[icebraining]

Also, you can verify via bitcoin address if you're dealing with a hacker who is known to give data back.

How so? Presumably they use a different one for each payment, no? Otherwise, how could they tell who paid?

[lkowalcz]

Apparently they reuse the primary wallet quite frequently:

http://www.coindesk.com/cryptowall-325-million-bitcoin-ranso...