Hello, I'm pleased to announce the release of bitcoinj 0.11, a library for writing Bitcoin applications that run on the JVM. BitcoinJ is widely used across the Bitcoin community; some users include Bitcoin Wallet for Android, MultiBit, Hive, blockchain.info, the biteasy.com block explorer (written in Lisp!), Circle, Neo/Bee (Cypriot payment network), bitpos.me, Bitcoin Touch, BlueMatt's relay network and DNS crawler, academic advanced contracts research and more.
The release-0.11 git tag is signed by Andreas Schildbach's GPG key. The commit
hash is 410d4547a7dd. This paragraph is signed by the same Bitcoin key as with
previous releases (check their release announcements to establish continuity).
Additionally, this email is signed using DKIM and for the first time, a key
that was ID verified by the Swiss government.
Key: 16vSNFP5Acsa6RBbjEA7QYCCRDRGXRFH4m
Signature for last paragraph:
H3DvWBqFHPxKW/cdYUdZ6OHjbq6ZtC5PHK4ebpeiE+FqTHyRLJ58BItbC0R2vo77h+DthpQigdEZ0V8ivSM7VIg=
Notable changes and new features
Thanks to Ken Sedgwick, an implementation of BIP39 ("Mnemonic code for
generating deterministic keys") has been added. This is compatible with the
latest Trezor implementation.
Thanks to Mike Belshe, the wallet can now send to P2SH addresses.
Thanks to Matt Corallo, the network layer was rewritten from scratch. It no
longer depends on Netty, and it now supports both blocking and non-blocking
sockets. In practice that means Java's built in support for transparent SSL and
SOCKS becomes available again, which in turn means connecting via Tor is now
possible. The new framework is lightweight, easy to understand and has been
running a DNS seed crawler for some months now.
Thanks to Kevin Greene, we've added some support for the BIP70 payment
protocol. Wallet authors can now consume payment requests, check their
signatures and submit payments with the new easy to use PaymentSession class.
The wallet-tool command line UI has support and an article explains how to use
it.
Thanks to Miron Cuperman, the wallet can now watch arbitrary addresses and
scripts. The wallet could previously watch an address as long as the public key
was known. Now it's possible to watch for addresses even when the public key is
not known.
Also thanks to Miron, Bloom filtering was also improved. The system now tracks
false positive rates and cleans the filter when FP rates get too high.
Unfortunately, some privacy bugs in Bloom filtering remain, which could
(amongst other things) allow a malicious remote peer to test whether you own a
particular key.
Thanks to Alex Taylor (bitpos.me), a new PostgreSQL based pruning block store
was added. This block store is fast, and indexes the UTXO set, allowing for
fast lookup of the balance of any given address.
A Java 8 based wallet template app is now included. The template is designed
for people writing contract based applications. It provides a simple app that
can be copy/pasted, which connects to the P2P network, manages a wallet, and
provides a GUI that shows progress, balance, address+qrcode for receiving money
and has a button that is used to empty the wallet out. It's designed to have an
attractive and modern look, with tasteful animations and artwork.
Micropayment channels got many big improvements to the API and implementation.
The release in 0.10 can be seen as a beta, in this release the micropayments
code has been taken for a test drive for a couple of real apps and many rough
edges polished as a result.
The default USER_THREAD executor can now be replaced, allowing a 1-line switch
of all callbacks onto a thread of your choice instead of needing to override
each callback, each time. This should simplify and clean up the GUI code of
wallet apps significantly.
The WalletTool command line app has a more convenient user interface now.
A new DNS seed has been added. The seed is run by Christian Decker, from ETH
Zurich.
bitcoinj 0.11 will shortly be available via Maven Central. Please use the
dependency verifier plugin and/or check the PGP signatures on the uploads, if
you use this!
Smaller improvements
We finished adding nullity annotations to the API. You should now be able to
assume that any method not annotated with @Nullable won't ever return null
values.
The WalletAppKit got a bunch of new features and convenience APIs.
The wallet will now create inputs with dummy signatures if the private key for
an output is missing, rather than throwing an exception. You can then edit the
input later to substitute in a real signature. This is useful when the signing
is being done elsewhere, outside of the library.
In full verification mode, execution of scripts (i.e. checking signatures) can
now be switched off. This is useful if you trust the source of the chain and
just want to calculate the UTXO set.
The wallet risk analysis code is now pluggable, better documented and checks
for finality in a more sensible way.
Various memory usage and flow control optimisations were made to allow much
larger wallets to sync on Android.
The transaction broadcast algorithm was changed to be more robust.
Double spend handling in the wallet was improved.
Generated signatures now use canonical S values. This will aid a future
hard-forking rule change which bans malleable signatures.
Some fixes were made for enable usage with the Orchid Tor library. Further
support for Tor is planned for future releases.
Notable bug fixes
Some hard-forking full verification bugs were fixed.
Thanks to Miron, PeerGroup now performs exponential backoff for peer
connections, for instance if we cannot connect to them or if they disconnect
us. This resolves an annoying bug in which if the library was configured with a
single peer that was down, it would spin in a tight loop consuming battery.
API changes
Some functionality of the Wallet class was moved into separate classes under
the wallet package.
The micropayments API and protocol changed. New clients/servers are not
compatible with apps running against previous releases.
The Wallet sendCoins/completeTx methods no longer return booleans or null to
indicate failure, they now throw InsufficientMoneyException or a subclass if
the transaction cannot be completed. The exception object typically contains
information on how much money is missing.
Some mis-named methods in the HD key derivation API were renamed.
The WalletEventListener interface has an extra method for watching scripts now.
Peer discovery classes moved under the net.discovery package
Any APIs that relied on Netty are now different.
New documentation
An article on the networking API
Info on testing your apps, and how to use regtest mode to make a private
Bitcoin network that allows you to mine blocks instantly.
A reference table showing which API's implement which Bitcoin Improvement
Proposals (BIPs).
Please note that as I am no longer employed by Google, after 0.11 signing the
Google contributor license agreement will no longer be necessary. I look
forward to welcoming contributions from Andreas Schildbach now this requirement
has gone away. Also, in future I plan to re-namespace the library from
com.google.bitcoin to org.bitcoinj - auto-migration scripts will be provided
when this is done.
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