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Archive Revision as of 02:47, 25 November 2012

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https://en.bitcoin.it/w/index.php?title=BIP_0030&oldid=33022
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Peter Todd 2013-10-21 00:51:10 -04:00
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{{bip}}
<pre>
BIP: 30
Title: Duplicate transactions
Author: Pieter Wuille <pieter.wuille@gmail.com>
Status: Accepted
Status: Final
Type: Standards Track
Created: 22-02-2012
</pre>
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==Specification==
To counter this problem, the following network rule is introduced:
*Blocks are not allowed to contain a transaction whose hash matches that of an earlier transaction in the same chain, unless that earlier transaction was already fully spent before said block.
*Blocks are not allowed to contain a transaction whose identifier matches that of an earlier, not-fully-spent transaction in the same chain.
This rule is to be applied to all blocks whose timestamp is after march 15, 2012, 0:00 UTC (unix timestamp 1331769600).
This rule is to be applied to all blocks whose timestamp is after a point in time that is yet to be decided.
==Rationale==
Whatever solution is used, the following law must be obeyed to guarantee sane behaviour: the set of usable
@ -40,8 +42,11 @@ The addition of this rule only makes some previously-valid blocks invalid. This
==Implementation==
A patch for the reference client can be found on https://github.com/sipa/bitcoin/tree/nooverwritetx
This BIP was implemented in Commit [https://github.com/bitcoin/bitcoin/commit/a206b0ea12eb4606b93323268fc81a4f1f952531 Do not allow overwriting unspent transactions (BIP 30)]
There have been additional commits to refine the implementation of this BIP.
==Acknowledgements==
Thanks to Russell O'Connor for finding and demonstrating this problem and helping test the patch, and to Ben Reeves for pointing out a few weaknesses in the implementation.
Thanks to Russell O'Connor for finding and demonstrating this problem, and helping test the patch.
[[Category:Developer]]
[[Category:Technical]]