Bitcoin Purchasing Minimums
We have had to restrict the number of transactions we send through our Bitcoin backend server every hour. To do this, we have temporarily implemented a minimum purchase amount.
The technical reason for this is that the backend server could previously have have sent out some transactions that would never confirm, i.e. you would never receive them. This is an unfortunate side effect of the malleability attack happening on the Bitcoin network. By ensuring that the server never sends unconfirmed change outputs, we can safely send Bitcoins out, but at a vastly reduced pace. This is because we can no longer assume that unconfirmed change inputs that we thought were sent by us are actually safe to send.