[bitcoin-dev] Dynamically Controlled Bitcoin Block Size Max Cap

Chris Wardell wardell.c at gmail.com
Tue Aug 18 17:26:45 UTC 2015

I'm no authority on the subject, but I don't understand why there is a max
block-size, other than anti-spam measures.

The only other reason I have heard for a max-block-size is to force people
into paying higher fees.

This seems like the wrong way to force fees.  If you want to force fees,
then do exactly that - make fees required, and set a minimum... don't force
people to pay fees by limiting transactions per second.  That's like
shooting yourself in the foot to get free surgery....

On Tue, Aug 18, 2015 at 8:13 AM, Upal Chakraborty via bitcoin-dev <
bitcoin-dev at lists.linuxfoundation.org> wrote:

> Regarding:
> http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-August/010295.html
> I am arguing with the following statement here...
> *I see problems to this approach. The biggest one I see is that a miner
>> with 11% of hash power could sabotage block size increases by only ever
>> mining empty blocks.*
> First, I would like to argue from economics' point of view. If someone
> wants to hold back the block size increase with 11% hash power by mining
> empty blocks, he has to sacrifice Tx fees, which is not economical. 11%
> hash power will most likely be a pool and pool miners will find out soon
> that they are losing Tx fees because of pool owner's intention. Hence,
> they'll switch pool and pool owner will lose out. This is the same reason
> why 51% attack will never happen, even if a pool gets more than 51% hash
> power.
> Next, I would like to propose a slightly modified technical solution to
> this problem in algorithmic format...
> If more than 50% of block's size, found in the first 2000 of the last
> difficulty period, is more than 90% MaxBlockSize
>          Double MaxBlockSize
> Else if more than 90% of block's size, found in the first 2000 of the last
> difficulty period, is less than 50% MaxBlockSize
>          Half MaxBlockSize
> Else
>          Keep the same MaxBlockSize
> This is how, those who want to stop increase, need to have more than 50%
> hash power. Those who want to stop decrease, need to have more than 10%
> hash power, but must mine more than 50% of MaxBlockSize in all blocks. In
> this approach, not only miners, but also the end user have their say.
> Because, end users will fill up the mempool, from where miners will take Tx
> to fill up the blocks. Please note that, taking first 2000 of the last 2016
> blocks is important to avoid data discrepancy among different nodes due to
> orphan blocks. It is assumed that a chain can not be orphaned after having
> 16 confirmation.
> Looking for comments.
> _______________________________________________
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> bitcoin-dev at lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
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