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Release notes for 0.8.2rc1
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Gavin Andresen
parent
056ab5b43f
commit
8f6709076e
@ -1,99 +1,80 @@
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(note: this is a temporary file, to be added-to by anybody, and deleted at
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release time)
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Building this from
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$ git shortlog --no-merges v0.7.1..
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Incompatible Changes
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--------------------
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This release no longer maintains a full index of historical transaction ids
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by default, so looking up an arbitrary transaction using the getrawtransaction
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RPC call will not work. If you need that functionality, you must run once
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with -txindex -reindex to rebuild block-chain indices (see below for more
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details).
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Improvements
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------------
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Mac and Windows binaries are signed with certificates owned by the Bitcoin
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Foundation, to be compatible with the new security features in OSX 10.8 and
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Windows 8.
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LevelDB, a fast, open-source, non-relational database from Google, is
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now used to store transaction and block indices. LevelDB works much better
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on machines with slow I/O and is faster in general. Berkeley DB is now only
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used for the wallet.dat file (public and private wallet keys and transactions
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relevant to you).
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Pieter Wuille implemented many optimizations to the way transactions are
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verified, so a running, synchronized node uses much less memory and does
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much less I/O. He also implemented parallel signature checking, so if you
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have a multi-CPU machine all CPUs will be used to verify transactions.
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New Features
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------------
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"Bloom filter" support in the network protocol for sending only relevant transactions to
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lightweight clients.
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contrib/verifysfbinaries is a shell-script to verify that the binary downloads
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at sourceforge have not been tampered with. If you are able, you can help make
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everybody's downloads more secure by running this occasionally to check PGP
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signatures against download file checksums.
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contrib/spendfrom is a python-language command-line utility that demonstrates
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how to use the "raw transactions" JSON-RPC api to send coins received from particular
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addresses (also known as "coin control").
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New/changed settings (command-line or bitcoin.conf file)
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--------------------------------------------------------
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dbcache : now controls LevelDB memory usage. Running with (for example) -dbcache=1000
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will use a gigabyte of memory and might make the initial blockchain download faster.
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par : controls how many threads to use to validate transactions. Defaults to the number
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of CPUs on your machine, use -par=1 to limit to a single CPU.
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txindex : maintains an extra index of old, spent transaction ids so they will be found
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by the getrawtransaction JSON-RPC method. Can only be set when the database is
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initialized.
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reindex : rebuild block and transaction indices from the downloaded block data.
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New JSON-RPC API Features
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-------------------------
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lockunspent / listlockunspent allow locking transaction outputs for a period of time so
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they will not be spent by other processes that might be accessing the same wallet.
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addnode / getaddednodeinfo methods, to connect to specific peers without restarting.
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importprivkey now takes an optional boolean parameter (default true) to control whether
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or not to rescan the blockchain for transactions after importing a new private key.
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gettxout retrieves a single transaction output from the current set of unspent outputs.
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Optionally, the mempool transactions are taken into account.
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gettxoutsetinfo calculates statistics about the current set of unspent outputs.
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Important Bug Fixes
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-------------------
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Privacy leak: the position of the "change" output in most transactions was not being
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properly randomized, making network analysis of the transaction graph to identify
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users' wallets easier.
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Zero-confirmation transaction vulnerability: accepting zero-confirmation transactions
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(transactions that have not yet been included in a block) from somebody you do not
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trust is still not recommended, because there will always be ways for attackers to
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double-spend zero-confirmation transactions. However, this release includes a bug
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fix that makes it a little bit more difficult for attackers to double-spend a
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certain type ("lockTime in the future") of zero-confirmation transaction.
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Dependency Changes
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Fee Policy changes
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------------------
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Qt 4.8.3 (compiling against older versions of Qt 4 should continue to work)
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The default fee for low-priority transactions is lowered from 0.0005 BTC
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(for each 1,000 bytes in the transaction; an average transaction is
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about 500 bytes) to 0.0001 BTC.
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Payments (transaction outputs) of 0.543 times the minimum relay fee
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(0.00005430 BTC) are now considered 'non-standard', because storing them
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costs the network more than they are worth and spending them will usually
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cost their owner more in transaction fees than they are worth.
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Non-standard transactions are not relayed across the network, are not included
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in blocks by most miners, and will not show up in your wallet until they are
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included in a block.
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The default fee policy can be overridden using the -mintxfee and -minrelaytxfee
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command-line options, but note that we intend to replace the hard-coded fees
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with code that automatically calculates and suggests appropriate fees in the
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0.9 release and note that if you set a fee policy significantly different from
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the rest of the network your transactions may never confirm.
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Bitcoin-Qt changes
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------------------
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* New icon and splash screen
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* Improve reporting of synchronization process
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* Remove hardcoded fee recommendations
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* Improve metadata of executable on MacOSX and Windows
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* Move export button to individual tabs instead of toolbar
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* Add "send coins" command to context menu in address book
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* Add "copy txid" command to copy transaction IDs from transaction overview
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* Save & restore window size and position when showing & hiding window
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* New translations: Arabic (ar), Bosnian (bs), Catalan (ca), Welsh (cy),
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Esperanto (eo), Interlingua (la), Latvian (lv) and many improvements
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to current translations
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MacOSX:
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* OSX support for click-to-pay (bitcoin:) links
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* Fix GUI disappearing problem on MacOSX (issue #1522)
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Linux/Unix:
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* Copy addresses to middle-mouse-button clipboard
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Command-line options
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--------------------
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* -walletnotify will call a command on receiving transactions that affect the wallet.
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* -alertnotify will call a command on receiving an alert from the network.
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* -par now takes a negative number, to leave a certain amount of cores free.
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JSON-RPC API changes
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--------------------
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* listunspent now lists account and address infromation.
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* getinfo now also returns the time adjustment estimated from your peers.
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* getpeerinfo now returns bytessent, bytesrecv and syncnode.
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* gettxoutsetinfo returns statistics about the unspent transaction output database.
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* gettxout returns information about a specific unspent transaction output.
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Networking changes
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------------------
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* Significant changes to the networking code, reducing latency and memory consumption.
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* Avoid initial block download stalling.
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* Remove IRC seeding support.
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* Performance tweaks.
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* Added testnet DNS seeds.
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Wallet compatibility/rescuing
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-----------------------------
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* Cases where wallets cannot be opened in another version/installation should be reduced.
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* -salvagewallet now works for encrypted wallets.
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