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Date: Sat, 1 Jun 2013 16:58:53 -0400
From: Peter Todd <pete@petertodd.org>
To: Luke-Jr <luke@dashjr.org>
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Cc: bitcoin-development@lists.sourceforge.net
Subject: Re: [Bitcoin-development] Proposal: soft-fork to make
anyone-can-spend outputs unspendable for 100 blocks
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On Sat, Jun 01, 2013 at 08:34:29PM +0000, Luke-Jr wrote:
> On Saturday, June 01, 2013 7:30:36 PM Peter Todd wrote:
> > scriptPubKey: <data> OP_TRUE
> >=20
> > ...
> > Along with that change anyone-can-spend outputs should be make IsStanda=
rd()
> > so they will be relayed.
>=20
> Data does not belong in the blockchain. People running nodes have all=20
> implicitly agreed to store the blocks for financial purposes, and storing=
data=20
> is a violation of that social contract. Proof-of-stake may be arguably=20
> financial, but I'm sure there must be a way to do it without spamming peo=
ple=20
> against their consent.
We have no way of preventing this, so ensure it's done in a way that
minimizes harm. For instance, my zookeyv key-value consensus system can
be implemented using transactions with txout pairs of the following
form:
Let H(d) =3D RIPEMD160(SHA256(d))
txout_k*2 : OP_DUP H(key) OP_EQUALVERIFY
txout_k*2+1: OP_DUP H(value) OP_EQUALVERIFY
With an additional rule to allow for references to previous sacrifices
with txouts of the form:
txout_n: OP_DUP H(txid:vout) OP_EQUALVERIFY
This is perfectly compatible with Gregory Maxwell's address pre-image
fix to data-in-chain storage, and at the same time is completely
unblockable by making such transactions more expensive - the whole point
is to prove you've sacrificed funds.
Yet another reason why increasing the blocksize is madness.
--=20
'peter'[:-1]@petertodd.org
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