[bitcoin-dev] Managing block size the same way we do difficulty (aka Block75)

Bram Cohen bram at bittorrent.com
Sat Dec 10 23:12:25 UTC 2016


On Mon, Dec 5, 2016 at 7:27 AM, t. khan via bitcoin-dev <
bitcoin-dev at lists.linuxfoundation.org> wrote:

>
> Put another way: let’s stop thinking about what the max block size should
> be and start thinking about how full we want the average block to be
> regardless of size. Over the last year, we’ve had averages of 75% or
> higher, so aiming for 75% full seems reasonable, hence naming this concept
> ‘Block75’.
>

That's effectively making the blocksize limit completely uncapped and only
preventing spikes, and even in the case of spikes it doesn't differentiate
between 'real' traffic and low value spam attacks. It suffers from the same
fundamental problems as bitcoin unlimited: There are in the end no
transaction fees, and inevitably some miners will want to impose some cap
on block size for practical purposes, resulting in a fork.

Difficulty adjustment works because there's a clear goal of having a
certain rate of making new blocks. Without a target to attempt automatic
adjustment makes no sense.
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