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From: Hector Chu <hectorchu@gmail.com>
Date: Wed, 19 Aug 2015 13:15:48 +0100
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To: Jameson Lopp <jameson.lopp@gmail.com>
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Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] A solution to increase the incentive of running a
	node
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On 19 August 2015 at 13:08, Jameson Lopp <jameson.lopp@gmail.com> wrote:
> If operating as an SPV node then it can check the transactions by querying
> other nodes.

SPV is for checking validity of transactions that have already entered
the blockchain, as I understand it. My proposal requires nodes to
validate transactions that are unconfirmed, and to commit to the
validation by doing a POW on it.

> On an unrelated note, it sounds like your proposal will significantly
> increase the data size of every transaction, which will create even more
> contention for block space.

If we stipulate that the coinbase fields only hold space for a single
pubkey, then the entire block header including the two coinbases
should only take an extra 100 bytes or so. Transactions are already
routinely 250 bytes+. So an increase of roughly 33%.