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From: Stephen Pair <stephen@bitpay.com>
Date: Wed, 13 Mar 2013 01:31:18 -0400
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Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Blocking uneconomical UTXO creation
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Instead of thinking in terms of blocking uneconomical transactions (how
would a node even determine what's economical?), what about thinking in
terms of paying for a feed of economical (i.e. profitable) transactions?
There is a market for fee bearing, profitable transactions...if there is no
one willing to pay to receive a transaction, then no one will bother
propagating it. Such a system would make it possible to determine the
probability of confirmation in a given timeframe for a given fee.
On Tue, Mar 12, 2013 at 3:49 AM, Peter Todd <pete@petertodd.org> wrote:
> On Sat, Mar 09, 2013 at 11:31:55PM -0500, Peter Todd wrote:
> > As discussed endlessly data in the UTXO set is more costly, especially
> > in the long run, than transaction data itself. The fee system is per KB
> > in a block, and thus doesn't properly capture the long-term costs of
> > UTXO creation.
>
> There's been a lot of discussion about this issue, and many people have
> asked that Bitcoin not arbitrarily block interesting potential uses of
> provably unspendable txouts for data applications, and similarly
> spendable txouts representing assets. I've changed my hardline position
> and now think we should support all that stuff. However, there is one
> remaining class of txout not yet talked about, unspendable but not
> provably so txouts. For instance we could make the following a standard
> transaction type:
>
> scriptPubKey: OP_HASH160 <20 byte digest> OP_EQUALVERIFY <data>
> scriptSig: <data>
>
> Of course, usually the 20 byte digest would be picked randomly, but it
> might not be, and thus all validating nodes will always have a copy of
> the data. With the 10KB limit on script sizes you can fit 9974 bytes of
> data per transaction output with very little waste.
>
> A good application is timestamping, with the advantage over
> coinbase/merkle tree systems in that you don't have to wait until your
> timestamp confirms, or even store the timestamp at all. Another
> application, quite possible with large block sizes and hence cheap or
> free transactions, is secure data backups. In particular such a service,
> perhaps called Google Chain Storage, can offer the unique guarantee that
> you can know you're data is secure by simply performing a successful
> Bitcoin transaction.
>
> --
> 'peter'[:-1]@petertodd.org
>
>
> ------------------------------------------------------------------------------
> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
> endpoint security space. For insight on selecting the right partner to
> tackle endpoint security challenges, access the full report.
> http://p.sf.net/sfu/symantec-dev2dev
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
>
--
Stephen Pair, Co-Founder, CTO
Does *your* website accept cash? bitpay.com
[image: bitpay-small]
ABC6 C11B BF75 9E2B FC6A B3E0 7B96 40B2 CAC0 C158
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<div dir=3D"ltr">Instead of thinking in terms of blocking uneconomical tran=
sactions (how would a node even determine what's economical?), what abo=
ut thinking in terms of paying for a feed of economical (i.e. profitable) t=
ransactions? There is a market for fee bearing, profitable transactions...i=
f there is no one willing to pay to receive a transaction, then no one will=
bother propagating it. =A0Such a system would make it possible to determin=
e the probability of confirmation in a given timeframe for a given fee.</di=
v>
<div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Tue, Mar 1=
2, 2013 at 3:49 AM, Peter Todd <span dir=3D"ltr"><<a href=3D"mailto:pete=
@petertodd.org" target=3D"_blank">pete@petertodd.org</a>></span> wrote:<=
br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left=
:1px #ccc solid;padding-left:1ex">
<div class=3D"im">On Sat, Mar 09, 2013 at 11:31:55PM -0500, Peter Todd wrot=
e:<br>
> As discussed endlessly data in the UTXO set is more costly, especially=
<br>
> in the long run, than transaction data itself. The fee system is per K=
B<br>
> in a block, and thus doesn't properly capture the long-term costs =
of<br>
> UTXO creation.<br>
<br>
</div>There's been a lot of discussion about this issue, and many peopl=
e have<br>
asked that Bitcoin not arbitrarily block interesting potential uses of<br>
provably unspendable txouts for data applications, and similarly<br>
spendable txouts representing assets. I've changed my hardline position=
<br>
and now think we should support all that stuff. However, there is one<br>
remaining class of txout not yet talked about, unspendable but not<br>
provably so txouts. For instance we could make the following a standard<br>
transaction type:<br>
<br>
scriptPubKey: OP_HASH160 <20 byte digest> OP_EQUALVERIFY <data>=
<br>
scriptSig: <data><br>
<br>
Of course, usually the 20 byte digest would be picked randomly, but it<br>
might not be, and thus all validating nodes will always have a copy of<br>
the data. With the 10KB limit on script sizes you can fit 9974 bytes of<br>
data per transaction output with very little waste.<br>
<br>
A good application is timestamping, with the advantage over<br>
coinbase/merkle tree systems in that you don't have to wait until your<=
br>
timestamp confirms, or even store the timestamp at all. Another<br>
application, quite possible with large block sizes and hence cheap or<br>
free transactions, is secure data backups. In particular such a service,<br>
perhaps called Google Chain Storage, can offer the unique guarantee that<br>
you can know you're data is secure by simply performing a successful<br>
Bitcoin transaction.<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
--<br>
'peter'[:-1]@<a href=3D"http://email.bitpay.com/wf/click?upn=3DPD-2=
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jOS-2ByvEI3032XdKnCZCsq-2FMOhkRURSRZLc3ku7VhLTIzNIvw-3D-3D" target=3D"_blan=
k">petertodd.org</a><br>
</font></span><br>---------------------------------------------------------=
---------------------<br>
Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester<br>
Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" =
in the<br>
endpoint security space. For insight on selecting the right partner to<br>
tackle endpoint security challenges, access the full report.<br>
<a href=3D"http://email.bitpay.com/wf/click?upn=3Dclv-2F4cJeMmAwKrWIy5r1pHm=
NKSjeHHsL7GwGZdM1NZbwiFi6PNn7ufn0yWxt6pse_FPVR34OW0iTCykNVpPzODvIQt2S-2BzCN=
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P0fB-2B0JPmEFDE9DtowuwqcPABVav1AOnT71bdEi8-2Fq4cg-3D-3D" target=3D"_blank">=
http://p.sf.net/sfu/symantec-dev2dev</a><br>_______________________________=
________________<br>
Bitcoin-development mailing list<br>
<a href=3D"mailto:Bitcoin-development@lists.sourceforge.net">Bitcoin-develo=
pment@lists.sourceforge.net</a><br>
<a href=3D"http://email.bitpay.com/wf/click?upn=3D5gbqSalhSqfN1zNfYP0Duq0J9=
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6Uf-2B0sLw0GF96Q-3D-3D" target=3D"_blank">https://lists.sourceforge.net/lis=
ts/listinfo/bitcoin-development</a><br>
<br></blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><font fa=
ce=3D"Helvetica"><span style=3D"font-size:12px">Stephen Pair, Co-Founder, C=
TO<br></span></font><div><div><p style=3D"margin-top:0px;margin-right:0px;m=
argin-bottom:0px;margin-left:0px">
Does=A0<i>your</i>=A0website accept cash?=A0<a href=3D"http://email.bitpay.=
com/wf/click?upn=3D6EQLaK-2BgXvAss2SsDJxT0IRUM3nZPIyJVSEW1KGcNz8-3D_FPVR34O=
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in-right:0px;margin-bottom:0px;margin-left:0px;font:normal normal normal 12=
px/normal Helvetica">
<img src=3D"cid:image001.png@01CC4F26.E94FE2A0" alt=3D"bitpay-small"></p><p=
style=3D"margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px=
;font:normal normal normal 12px/normal Helvetica">ABC6 C11B BF75 9E2B FC6A =
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</div></div>
</div>
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