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Date: Sun, 14 Jul 2013 19:40:21 +0000
Message-ID: <CAPaL=UXZP39CxjsVH5z0rvvvrFtt6uXbuy_Sn6Nz+CDUCt_T3A@mail.gmail.com>
From: John Dillon <john.dillon892@googlemail.com>
To: Pieter Wuille <pieter.wuille@gmail.com>
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Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Reward for P2SH IsStandard() patch.
Precedence: list

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On Sun, Jul 14, 2013 at 7:28 PM, Pieter Wuille <pieter.wuille@gmail.com> wrote:
> On Sun, Jul 14, 2013 at 07:05:26PM +0000, John Dillon wrote:
>> Long-term we should be using P2SH with an inner OP_CHECKSIG for most addresses
>> as it's a 1 byte savings. Change addresses can have this done first, although
>> bitcoinj support will help so that satoshidice and similar sites can pay to
>> P2SH change. As for multisig's P2SH overhead for a 1-of-2 and 2-of-2 and
>> 3-of-3, is 10%, 8.6% and 6.2% respectively, all pretty minor, especially if you
>> assume the blocksize limit will be raised.
>
> Small comment: the current implementation in the reference client uses a custom
> script encoder for the UTXO database, which stores every (valid) send-to-pubkey
> as 33 bytes and every send-to-pubkeyhash or send-to-scripthash as 21 bytes.
> So for "standard" address payment, there is no storage impact of using P2SH
> instead.

By "impact" I am referring to the impact on transaction size and thus
blockchain space and fees, not UTXO size as stored by nodes themselves.
Specifically take the size of the txout and txin and compare the version using
P2SH to the equivalent version not using it to get my numbers.

Anyway, given how much uncompressed keys are still used obviously fee pressure
isn't even close to getting people to create efficient transactions.
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