Jeff Garzik recently proposed that the upper blocksize limit be removed
entirely, with a "soft" limit being enforced via miner vote, recorded by
hashing power.

This mechanism within the protocol for users to have any influence over
the miner vote. We can add that back by providing a way for transactions
themselves to set a flag determining whether or not they can be included
in a block casting a specific vote.

We can simplify Garzik's vote to say that one of the nVersion bits
either votes for the blocksize to be increased, or decreased, by some
fixed ratio (e.g 2x or 1/2x) the next interval. Then we can use a
nVersion bit in transactions themselves, also voting for an increase or
decrease. Transactions may only be included in blocks with an
indentical vote, thus providing miners with a monetary incentive via
fees to vote according to user wishes.

Of course, to cast a "don't care" vote we can either define an
additional bit, or sign the transaction with both versions. Equally we
can even have different versions with different fees, broadcast via a
mechanism such as replace-by-fee.

See also John Dillon's proposal for proof-of-stake blocksize voting:


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