On Dec 8, 2015, at 6:02 AM, Gregory Maxwell via bitcoin-dev 
<bitcoin-dev@lists.linuxfoundation.org> wrote:

> The particular proposal amounts to a 4MB blocksize increase at worst.

I understood that SegWit would allow about 1.75 MB of data in the average case 
while also allowing up to 4 MB of data in the worst case. This means that the 
mining and block distribution network would need a larger safety factor to deal 
with worst-case situations, right? If you want to make sure that nothing goes 
wrong when everything is at its worst, you need to size your network pipes to 
handle 4 MB in a timely (DoS-resistant) fashion, but you'd normally only be 
able to use 1.75 MB of it. It seems to me that it would be safer to use a 3 MB 
limit, and that way you'd also be able to use 3 MB of actual transactions.

As an accounting trick to bypass the 1 MB limit, SegWit sounds like it might 
make things less well accounted for.

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