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Diffstat (limited to 'bip-0030.mediawiki')
| -rw-r--r-- | bip-0030.mediawiki | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/bip-0030.mediawiki b/bip-0030.mediawiki index 56ef3de..a63b737 100644 --- a/bip-0030.mediawiki +++ b/bip-0030.mediawiki @@ -8,11 +8,16 @@ Status: Final Type: Standards Track Created: 2012-02-22 + License: BSD-2-Clause </pre> ==Abstract== This document gives a specification for dealing with duplicate transactions in the block chain, in an attempt to solve certain problems the reference implementations has with them. +==Copyright== + +This BIP is licensed under the 2-clause BSD license. + ==Motivation== So far, the Bitcoin reference implementation always assumed duplicate transactions (transactions with the same identifier) didn't exist. This is not true; in particular coinbases are easy to duplicate, and by building on duplicate coinbases, duplicate normal transactions are possible as well. Recently, an attack that exploits the reference implementation's dealing with duplicate transactions was described and demonstrated. It allows reverting fully-confirmed transactions to a single confirmation, making them vulnerable to become unspendable entirely. Another attack is possible that allows forking the block chain for a subset of the network. |