@rebroad Yup. OTOH the cost difference for the attacker isn't huge, about an order of magnitude better than just buying p2p resources with fees, so it's not an attack I'm very worried about. I actually did write and test up some quick code that just adjusts nSize so the fee calculations end up fair, but there isn't a pressing need for it yet. Creating transactions that simply can't be mined on the other hand is approximately ∞ cheaper than buying mempool RAM and network bandwidth with fees!