Since at least 80% of the Bitcoin network is now protected against
this attack, I've been given permission to disclose it:
The Merkle hash implementation that Bitcoin uses to calculate the
Merkle root in a block header is flawed in that one can easily
construct multiple lists of hashes that map t
On Wednesday, August 22, 2012 2:25:20 AM Forrest Voight wrote:
> An unpatched Bitcoin installation can be permanently wedged at its
> current highest block using this and the fact that Bitcoin caches
> orphan blocks in a disk-backed database. To do so, the attacker must
> send it a valid block (tha
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