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Bitcoin-Qt 0.6.2

Bitcoin version 0.6.2 is now available for download at:

This is a bug-fix and code-cleanup release, with no major new features.

Please report bugs using the github issue tracker at:


Much faster shutdowns. However, the blkindex.dat file is no longer portable to different data directories by default. If you need a portable blkindex.dat file then run with the new -detachdb=1 option or the "Detach databases at shutdown" GUI preference.

Fixed, a bug that could cause long-running nodes to crash.

Mac and Windows binaries are compiled against OpenSSL 1.0.1b (Linux binaries are dynamically linked to the version of OpenSSL on the system).


Use 'git shortlog --no-merges v0.6.0..' for a summary of this release.

Source codebase changes

  • Many source code cleanups and warnings fixes. Close to building with -Wall
  • Locking overhaul, and several minor locking fixes
  • Several source code portability fixes, e.g. FreeBSD

JSON-RPC interface changes

  • addmultisigaddress enabled for mainnet (previously only enabled for testnet)

Network protocol changes

  • protocol version 60001
  • added nonce value to "ping" message (BIP 31)
  • added new "pong" message (BIP 31)

Backend storage changes

  • Less redundant database flushing, especially during initial block download
  • Shutdown improvements (see above)

Qt user interface

  • minor URI handling improvements
  • progressbar improvements
  • error handling improvements (show message box rather than console exception, etc.)
  • by popular request, make 4th bar of connection icon green