---
title: Bitcoin-Qt version 0.8.3 released
---
Bitcoin-Qt version 0.8.3 is now available from:
  <http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.8.3/>

This is a maintenance release to fix a denial-of-service attack that
can cause nodes to crash.

Please report bugs using the issue tracker at github:
  <https://github.com/bitcoin/bitcoin/issues>


How 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 0.8.3 your blockchain files will be re-indexed, which will take
anywhere from 30 minutes to several hours, depending on the speed of
your machine.

0.8.3 Release notes
===================

Truncate over-size messages to prevent a memory exhaustion attack.

Fix a regression that causes excessive re-writing of the `peers.dat` file.

0.8.2 Release notes
===================

Fee Policy changes
------------------

The default fee for low-priority transactions is lowered from 0.0005 BTC 
(for each 1,000 bytes in the transaction; an average transaction is
about 500 bytes) to 0.0001 BTC.

Payments (transaction outputs) of 0.543 times the minimum relay fee
(0.00005430 BTC) are now considered 'non-standard', because storing them
costs the network more than they are worth and spending them will usually
cost their owner more in transaction fees than they are worth.

Non-standard transactions are not relayed across the network, are not included
in blocks by most miners, and will not show up in your wallet until they are
included in a block.

The default fee policy can be overridden using the -mintxfee and -minrelaytxfee
command-line options, but note that we intend to replace the hard-coded fees
with code that automatically calculates and suggests appropriate fees in the
0.9 release and note that if you set a fee policy significantly different from
the rest of the network your transactions may never confirm.

Bitcoin-Qt changes
------------------

* New icon and splash screen
* Improve reporting of synchronization process
* Remove hardcoded fee recommendations
* Improve metadata of executable on MacOSX and Windows
* Move export button to individual tabs instead of toolbar
* Add "send coins" command to context menu in address book
* Add "copy txid" command to copy transaction IDs from transaction overview
* Save & restore window size and position when showing & hiding window
* New translations: Arabic (ar), Bosnian (bs), Catalan (ca), Welsh (cy),
  Esperanto (eo), Interlingua (la), Latvian (lv) and many improvements
  to current translations

MacOSX:
* OSX support for click-to-pay (bitcoin:) links
* Fix GUI disappearing problem on MacOSX (issue #1522)

Linux/Unix:
* Copy addresses to middle-mouse-button clipboard


Command-line options
--------------------

* -walletnotify will call a command on receiving transactions that affect the wallet.
* -alertnotify will call a command on receiving an alert from the network.
* -par now takes a negative number, to leave a certain amount of cores free.

JSON-RPC API changes
--------------------

* fixed a getblocktemplate bug that caused excessive CPU creating blocks.
* listunspent now lists account and address infromation.
* getinfo now also returns the time adjustment estimated from your peers.
* getpeerinfo now returns bytessent, bytesrecv and syncnode.
* gettxoutsetinfo returns statistics about the unspent transaction output database.
* gettxout returns information about a specific unspent transaction output.


Networking changes
------------------

* Significant changes to the networking code, reducing latency and memory consumption.
* Avoid initial block download stalling.
* Remove IRC seeding support.
* Performance tweaks.
* Added testnet DNS seeds.

Wallet compatibility/rescuing
-----------------------------

* Cases where wallets cannot be opened in another version/installation should be reduced.
* -salvagewallet now works for encrypted wallets.


Known Bugs
----------

* Entering the `getblocktemplate` or `getwork` RPC commands into the Bitcoin-Qt debug
console will cause Bitcoin-Qt to crash. Run Bitcoin-Qt with the -server command-line
option to workaround.

Thanks to everybody who contributed to the 0.8.2 and 0.8.3 releases!
--------------------------------------------------------------------

* APerson241
* Andrew Poelstra
* Calvin Owens
* Chuck LeDuc Díaz
* Colin Dean
* David Griffith
* David Serrano
* Eric Lombrozo
* Gavin Andresen
* Gregory Maxwell
* Jeff Garzik
* Jonas Schnelli
* Larry Gilbert
* Luke Dashjr
* Matt Corallo
* Michael Ford
* Mike Hearn
* Patrick Brown
* Peter Todd
* Philip Kaufmann
* Pieter Wuille
* Richard Schwab
* Roman Mindalev
* Scott Howard
* Tariq Bashir
* Warren Togami
* Wladimir J. van der Laan
* freewil
* gladoscc
* kjj2
* mb300sd
* super3
