1 Bitcoin-Qt version 0.8.0 is now available from:
2 http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.8.0/
4 This is a major release designed to improve performance and handle the
5 increasing volume of transactions on the network.
7 Please report bugs using the issue tracker at github:
8 https://github.com/bitcoin/bitcoin/issues
13 If you are running an older version, shut it down. Wait
14 until it has completely shut down (which might take a few minutes for older
15 versions), then run the installer (on Windows) or just copy over
16 /Applications/Bitcoin-Qt (on Mac) or bitcoind/bitcoin-qt (on Linux).
18 The first time you run after the upgrade a re-indexing process will be
19 started that will take anywhere from 30 minutes to several hours,
20 depending on the speed of your machine.
25 This release no longer maintains a full index of historical transaction ids
26 by default, so looking up an arbitrary transaction using the getrawtransaction
27 RPC call will not work. If you need that functionality, you must run once
28 with -txindex=1 -reindex=1 to rebuild block-chain indices (see below for more
34 Mac and Windows binaries are signed with certificates owned by the Bitcoin
35 Foundation, to be compatible with the new security features in OSX 10.8 and
38 LevelDB, a fast, open-source, non-relational database from Google, is
39 now used to store transaction and block indices. LevelDB works much better
40 on machines with slow I/O and is faster in general. Berkeley DB is now only
41 used for the wallet.dat file (public and private wallet keys and transactions
44 Pieter Wuille implemented many optimizations to the way transactions are
45 verified, so a running, synchronized node uses less working memory and does
46 much less I/O. He also implemented parallel signature checking, so if you
47 have a multi-CPU machine all CPUs will be used to verify transactions.
52 "Bloom filter" support in the network protocol for sending only relevant transactions to
55 contrib/verifysfbinaries is a shell-script to verify that the binary downloads
56 at sourceforge have not been tampered with. If you are able, you can help make
57 everybody's downloads more secure by running this occasionally to check PGP
58 signatures against download file checksums.
60 contrib/spendfrom is a python-language command-line utility that demonstrates
61 how to use the "raw transactions" JSON-RPC api to send coins received from particular
62 addresses (also known as "coin control").
64 New/changed settings (command-line or bitcoin.conf file)
65 --------------------------------------------------------
67 dbcache : controls LevelDB memory usage.
69 par : controls how many threads to use to validate transactions. Defaults to the number
70 of CPUs on your machine, use -par=1 to limit to a single CPU.
72 txindex : maintains an extra index of old, spent transaction ids so they will be found
73 by the getrawtransaction JSON-RPC method.
75 reindex : rebuild block and transaction indices from the downloaded block data.
77 New JSON-RPC API Features
78 -------------------------
80 lockunspent / listlockunspent allow locking transaction outputs for a period of time so
81 they will not be spent by other processes that might be accessing the same wallet.
83 addnode / getaddednodeinfo methods, to connect to specific peers without restarting.
85 importprivkey now takes an optional boolean parameter (default true) to control whether
86 or not to rescan the blockchain for transactions after importing a new private key.
91 Privacy leak: the position of the "change" output in most transactions was not being
92 properly randomized, making network analysis of the transaction graph to identify
93 users' wallets easier.
95 Zero-confirmation transaction vulnerability: accepting zero-confirmation transactions
96 (transactions that have not yet been included in a block) from somebody you do not
97 trust is still not recommended, because there will always be ways for attackers to
98 double-spend zero-confirmation transactions. However, this release includes a bug
99 fix that makes it a little bit more difficult for attackers to double-spend a
100 certain type ("lockTime in the future") of zero-confirmation transaction.
105 Qt 4.8.3 (compiling against older versions of Qt 4 should continue to work)
108 Thanks to everybody who contributed to this release:
109 ----------------------------------------------------
131 Wladimir J. van der Laan