To: Btc Ideas <btcideas@protonmail.com>,
	Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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From: Stian Ellingsen <stian@plaimi.net>
Message-ID: <c0d518f4-ffb5-704b-02ee-d9587415571c@plaimi.net>
Date: Mon, 27 Mar 2017 19:50:12 +0200
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Subject: Re: [bitcoin-dev] Encouraging good miners
Precedence: list

On 27/03/17 18:12, Btc Ideas via bitcoin-dev wrote:

> Add a preference for mined blocks to be the one with more
> transactions. This comes into play when 2 blocks of the same height
> are found. The first good block mined would be orphaned if it had
> less transactions than another. Optionally, have this rule apply to
> the current block and the previous one.

This would encourage miners to make their own tiny junk transactions
to fill up their blocks, perhaps leaving larger, more space-efficient
transactions in the mempool.

> This increases incentive for full blocks because a miner thinking
> the faster propagation of a smaller block will win him the reward,
> but that would no longer be a good assumption.

> I read some miners could attack a chain by mining small or empty
> blocks. This makes that a little more difficult, but they can still
> attack the chain many ways.

"Good" miners should probably build upon the block with a set of
transactions more similar to what they themselves would include based
on their mempool at the time.  However, miners don't have an incentive
to do so today.  Instead, they may be better off building upon the
block that leaves the most valuable transactions in the mempool,
e.g. a small or empty block, and maybe leave some valuable
transactions in the mempool for the next miner.[1]  This issue could
possibly be addressed by a soft-fork that requires miners to pay a
portion of their fees to future miners.

[1]
https://freedom-to-tinker.com/2016/10/21/bitcoin-is-unstable-without-the-=
block-reward/

--=20
Stian