# Gavin Andresen
# 2012-06-20 16:54:47
# https://bitcointalk.org/index.php?topic=88734.msg977560#msg977560

We're releasing 0.6.3 to fix two important issues (a serious potential denial-of-service attack, and to improve new-block propagation times for blocks containing lots of transactions). @p{par}

If you can, please help do some sanity testing@p{--} shutdown bitcoin, then download, install, and run 0.6.3 and let us know "works nicely for me running on 64-bit Ubuntu 10.04" by posting a quick reply to this thread. @p{par}

Release notes: @p{par}

Bitcoin version 0.6.3rc1 is now available for download at: @p{brk}
  @s{(link)} @p{par}

This is a bug-fix release, with no new features. @p{par}

CHANGE SUMMARY @p{brk}
============== @p{par}

Fixed a serious denial-of-service attack that could cause the @p{brk}
bitcoin process to become unresponsive. Thanks to Sergio Lerner @p{brk}
for finding and responsibly reporting the problem. (CVE-2012-3789) @p{par}

Optimized the process of checking transaction signatures, to @p{brk}
speed up processing of new block messages and make propagating @p{brk}
blocks across the network faster. @p{par}

Fixed an obscure bug that could cause the bitcoin process to get @p{brk}
stuck on an invalid block-chain, if the invalid chain was @p{brk}
hundreds of blocks long. @p{par}

Bitcoin-Qt no longer automatically selects the first address @p{brk}
in the address book (Issue #1384). @p{par}

Fixed minimize-to-dock behavior of Bitcon-Qt on the Mac. @p{par}

Added a block checkpoint at block 185,333 to speed up initial @p{brk}
blockchain download. @p{par}

 @p{brk}
Thanks to everybody who contributed to this release: @p{brk}
==================================================== @p{par}

Chris Moore @p{brk}
Christian von Roques @p{brk}
Fordy @p{brk}
Gavin Andresen @p{brk}
Jeff Garzik @p{brk}
Luke Dashjr @p{brk}
Matt Corallo @p{brk}
Michael Hendricks @p{brk}
Peter Todd @p{brk}
Philip Kaufmann @p{brk}
Pieter Wuille @p{brk}
R E Broadley @p{brk}
Sergio Lerner @p{brk}
Wladimir J. van der Laan @p{brk}