Bitcoin-Qt 0.8.6

Bitcoin-Qt version 0.8.6 is now available from: is a maintenance release to fix a critical bug; we urge all users to upgrade. Please report bugs using the issue tracker at to Upgrade -------------- If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), then run the installer (on Windows) or just copy over /Applications/Bitcoin-Qt (on Mac) or bitcoind/bitcoin-qt (on Linux). If you are upgrading from version 0.7.2 or earlier, the first time you run 0.8.6 your blockchain files will be re-indexed, which will take anywhere from 30 minutes to several hours, depending on the speed of your machine. 0.8.6 Release notes =================== - Default block size increase for miners. (see Remove the all-outputs-must-be-greater-than-CENT-to-qualify-as-free rule for relaying (see Lower maximum size for free transaction creation (see OSX block chain database corruption fixes - Update leveldb to 1.13 - Use fcntl with `F_FULLSYNC` instead of fsync on OSX - Use native Darwin memory barriers - Replace use of mmap in leveldb for improved reliability (only on OSX) - Fix nodes forwarding transactions with empty vins and getting banned - Network code performance and robustness improvements - Additional debug.log logging for diagnosis of network problems, log timestamps by default - Fix Bitcoin-Qt startup crash when clicking dock icon on OSX - Fix memory leaks in CKey::SetCompactSignature and Key::SignCompact - Fix rare GUI crash on send - Various small GUI, documentation and build fixes Warning ------- - There have been frequent reports of users running out of virtual memory on 32-bit systems during the initial sync. Hence it is recommended to use a 64-bit executable if possible. A 64-bit executable for Windows is planned for 0.9.