Archive Revision as of 02:47, 25 November 2012

https://en.bitcoin.it/w/index.php?title=BIP_0030&oldid=33022

bip-0030.mediawiki

@@ -1,8 +1,10 @@
+{{bip}}
+
 <pre>
   BIP: 30
   Title: Duplicate transactions
   Author: Pieter Wuille <[email protected]>
-  Status: Accepted
+  Status: Final
   Type: Standards Track
   Created: 22-02-2012
 </pre>
@@ -15,9 +17,9 @@ So far, the Bitcoin reference implementation always assumed duplicate transactio
 
 ==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]]