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Subject: [Bitcoin-development] bitcoinj 0.12
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I=92m pleased to announce version 0.12 of bitcoinj, one of the worlds =
most popular Bitcoin libraries. It is used by at least four Android =
wallets, three desktop wallets, blockchain.info, Circle, biteasy, =
CryptoCorp, Lighthouse, BlueMatt=92s relay network, bitpos, countless =
alt coin wallets, for academic research projects and much more.

This release represents 8 months of work. The biggest new feature is HD =
wallets. Other notable enhancements include a bundled Tor client that =
can be activated with one line of code, support for multisig wallets, =
much faster and deterministic ECDSA, many API improvements and big =
upgrades to the included GUI wallet which can be seen in a new =
screencasted tutorial.

The commit hash of bitcoinj 0.12 is =
83a9a71f3fff3f223d0737ad758b519a39dbbd62.=20

New in this release

Privacy enhancements:
Wallets are now hierarchical and deterministic (HD) by default, using =
the BIP32 specification. Support for mnemonic codes (BIP 39) is also =
included. Change and receive addresses are no longer being reused. Old =
wallets are upgraded in place using the private key of the oldest =
non-rotating key as the seed bytes, so old backups remain valid.
Thanks to devrandom, we have an integrated Tor mode using the Orchid =
library. The user does not have to install the Tor client as it=92s all =
pure Java. WalletAppKit users can enable usage of Tor with a single line =
of code. This support should be considered experimental for now.
Thanks to Kosta Korenkov, we have an experimental multisig wallets =
implementation. Multisig (also =93married=94) wallets are HD wallets =
that are connected to a third party risk analysis service or device. =
When married, the wallet tracks multiple BIP32 key trees, keeps them in =
sync and starts vending P2SH addresses.
As part of this work, transaction signing is now pluggable. =
TransactionSigner implementations can be added to the wallet and will be =
serialized into and out of the users saved wallet file. Signers are =
given a transaction to sign in sequence. This is intended for risk =
analysis providers to provide a class that talks to their server to get =
a signature of the right form, so that all bitcoinj based wallets can be =
easily upgraded to support the new provider.
Reject messages are now deserialized and logged, though not yet exposed =
in the API.
Upgraded to Guava 16 and Bouncy Castle 1.51. Thanks to Peter Dettman and =
the rest of the Bouncy Castle team, bitcoinj now uses deterministic =
ECDSA for signing and we=92re now using an accelerated secp256k1 =
implementation that exploits the special properties of this curve, for =
dramatically faster calculations.
Payment protocol code improvements: Some X.509 utility code was =
refactored out of PaymentSession for general usage. StartCom was added =
to the default trust store which was promoted to override the system =
trust store on non-Android platforms. A command line tool to dump =
requests to stdout was added.
Thanks to Andreas Schildbach:
We are now BIP62 (canonical push encodings) compliant.
A new Coin class replaces usage of BigInteger for marking values that =
are quantities of bitcoin. Formatting has moved into the new =
MonetaryFormat class.
The wallet now saves the fee paid on transactions we calculated =
ourselves. This is useful for putting it into a wallet user interface.
Transactions can have user memos and exchange rates attached, that will =
be saved by the wallet.
Support for decrypting BIP 38 protected private keys has been added.
Checkpoints can now be stored textually as well as in the old binary =
format.
There is also a new BtcFormat API that provides an alternative to =
MonetaryFormat that plugs in to the java.text framework.
Added new DNS seed from Addy Yeow.
Wallets can now have string->byte[] mappings attached to them, for =
lighter weight extensions.
Thanks to Richard Green, there is now a Python version of the =
ForwardingService program from the getting started tutorial. This shows =
how to use bitcoinj from Python using the Jython interpreter.
bitcoinj now probes localhost for a Bitcoin node and automatically uses =
that instead of the P2P network, when present. This means any bitcoinj =
based app can be easily upgraded from SPV to full security just by =
running Core at the same time: no setup needed.
Thanks to Michael Bumann, there are now more example apps showing how to =
use parts of the API.
WalletTemplate/WalletAppKit improvements. WalletTemplate is a demo app =
that shows how to create a cross-platform GUI wallet with a modern style =
and 60fps animations. WalletAppKit is a very high level API for creating =
apps that have a Bitcoin wallet:
Now supports mnemonic code and restore from seed words. A date picker is =
provided to cut down on the amount of chain that needs to be rescanned.
Support for encrypting wallets. Password is requested when needed. The =
difficulty of the scrypt function is selected to always take a fixed =
number of seconds even if hardware gets more powerful.
Some new animation and utility code backported from Lighthouse.
Tor support
Thanks to Martin Zachrison, the micropayment channels implementation has =
received various improvements.
Thanks to Eric Tierney (Circle), the Postgres store can now take a =
custom schema.
The Bloom filtering API has been extended so FilteredBlock objects can =
now be produced from Block objects given a BloomFilter. Previously there =
was support for client-side Bloom usage but no implementation of the =
generation part.
Many other bugfixes, cleanups, minor tweaks and small new APIs.
Documentation and tutorials

A JavaScript tutorial has been added, showing how to use bitcoinj from =
this language. More tutorials in other languages will come in future.
The =93Working with the wallet=94 document has been significantly =
extended to cover encryption, watching wallets, HD wallets and =
multisig/married wallets.
A new document and accompanying screencast shows how to extend the =
WalletTemplate app to have a transactions list, and then make a =
native/bundled packages that don=92t need the user to install Java. By =
following this tutorial you will learn how to make a basic cross =
platform desktop wallet of your own.
All other docs were refreshed to the latest APIs.
API changes

The package name has changed to org.bitcoinj and the core Maven artifact =
name is now =93bitcoinj-core=94. You can auto-port most of your code by =
running find . -name '*.java' \| xargs sed -i .bak =
's/com.google.bitcoin./import org.bitcoinj./g
Wallet.completeTx now throws more precise unchecked exceptions in edge =
cases, instead of IllegalArgumentException.
The use of BigInteger to represent quantities of Bitcoin has been =
replaced with the more efficient, type safe and useful class Coin. Coin =
is mostly source compatible with BigInteger so you can probably just do =
a search and replace to update your codebase. =
Utils.bitcoinValueToFriendlyString and friends moved to CoinFormat.
NetworkParameters.getProofOfWorkLimit was renamed to getMaxTarget for =
consistency with other Bitcoin codebases.
The library no longer uses the misleading term =93nanocoins=94 to mean =
satoshis (the old term predated the use of the word satoshi to describe =
the smallest possible amount of bitcoin).
TransactionConfidence no longer tracks total work done.
Because outputs are now shuffled any code during that assumes the =
ordering is preserved will break. You can set the shuffleOutputs field =
of SendRequest to false to disable this behaviour if you need to.
The ECKey and HD API=92s have changed quite a bit: several constructors =
were replaced with clearer static factory methods that make it more =
obvious how their parameters are interpreted. The new methods don=92t =
change their behaviour depending on the pattern of nulls passed into =
them.
Some unit testing utilities have been moved to the new testing =
subpackage and cleaned up/rearranged. It should be easier to write unit =
tests for your app that need a simulated network now. DeterministicKey =
now derives from ECKey.
We now use Utils.HEX.encode() and Utils.HEX.decode() to do translation =
to and from base 16.
Transaction.hashTransactionForSignature was renamed to just =
hashForSignature.
The subVer string sent by bitcoinj now has a lower cased first =
component.


--Apple-Mail=_4CE7191A-91B4-4D75-98D8-A4CF7F12F95C
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=windows-1252

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dwindows-1252"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">I=92m =
pleased to announce version 0.12 of bitcoinj, one of the worlds most =
popular Bitcoin libraries. It is used by at least four Android wallets, =
three desktop wallets, blockchain.info, Circle, biteasy, CryptoCorp, =
Lighthouse, BlueMatt=92s relay network, bitpos, countless alt coin =
wallets, for academic research projects and much more.<div class=3D""><br =
class=3D""></div><div class=3D"">This release represents 8 months of =
work. The biggest new feature is&nbsp;HD wallets. Other notable =
enhancements include a bundled Tor client that can be activated with one =
line of code, support for multisig wallets, much faster and =
deterministic ECDSA, many API improvements and big upgrades to the =
included GUI wallet which can be seen in&nbsp;<a =
href=3D"https://bitcoinj.github.io/simple-gui-wallet" class=3D"">a new =
screencasted tutorial</a>.</div><div class=3D""><br class=3D""></div><div =
class=3D"">The commit hash of bitcoinj 0.12 =
is&nbsp;83a9a71f3fff3f223d0737ad758b519a39dbbd62.&nbsp;</div><div =
class=3D""><br></div><div class=3D""><h2 id=3D"version-012" class=3D"" =
style=3D"color: rgb(56, 56, 56); font-family: NanLight, =
sans-serif;"><span class=3D"" style=3D"font-weight: normal;">New in this =
release</span></h2><ul class=3D"" style=3D"padding-left: 20px; =
margin-left: 0px; color: rgb(100, 100, 100); font-family: NanLight, =
sans-serif;"><li style=3D"padding: 5px 0px; line-height: 1.5em;">Privacy =
enhancements:<ul class=3D"" style=3D"padding-left: 20px; margin-left: =
0px; list-style-type: disc;"><li style=3D"padding: 5px 0px; line-height: =
1.5em;">Wallets are now hierarchical and deterministic (HD) by default, =
using the BIP32 specification. Support for mnemonic codes (BIP 39) is =
also included. Change and receive addresses are no longer being reused. =
Old wallets are upgraded in place using the private key of the oldest =
non-rotating key as the seed bytes, so old backups remain valid.</li><li =
style=3D"padding: 5px 0px; line-height: 1.5em;">Thanks to devrandom, we =
have an integrated Tor mode using the Orchid library. The user does not =
have to install the Tor client as it=92s all pure Java. WalletAppKit =
users can enable usage of Tor with a single line of code. This support =
should be considered experimental for now.</li></ul></li><li =
style=3D"padding: 5px 0px; line-height: 1.5em;">Thanks to Kosta =
Korenkov, we have an experimental multisig wallets implementation. =
Multisig (also =93married=94) wallets are HD wallets that are connected =
to a third party risk analysis service or device. When married, the =
wallet tracks multiple BIP32 key trees, keeps them in sync and starts =
vending P2SH addresses.<ul class=3D"" style=3D"padding-left: 20px; =
margin-left: 0px; list-style-type: disc;"><li style=3D"padding: 5px 0px; =
line-height: 1.5em;">As part of this work, transaction signing is now =
pluggable. TransactionSigner implementations can be added to the wallet =
and will be serialized into and out of the users saved wallet file. =
Signers are given a transaction to sign in sequence. This is intended =
for risk analysis providers to provide a class that talks to their =
server to get a signature of the right form, so that all bitcoinj based =
wallets can be easily upgraded to support the new =
provider.</li></ul></li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">Reject messages are now deserialized and logged, though not yet =
exposed in the API.</li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">Upgraded to Guava 16 and Bouncy Castle 1.51. Thanks to Peter =
Dettman and the rest of the Bouncy Castle team, bitcoinj now uses =
deterministic ECDSA for signing and we=92re now using an accelerated =
secp256k1 implementation that exploits the special properties of this =
curve, for dramatically faster calculations.</li><li style=3D"padding: =
5px 0px; line-height: 1.5em;">Payment protocol code improvements: Some =
X.509 utility code was refactored out of PaymentSession for general =
usage. StartCom was added to the default trust store which was promoted =
to override the system trust store on non-Android platforms. A command =
line tool to dump requests to stdout was added.</li><li style=3D"padding: =
5px 0px; line-height: 1.5em;">Thanks to Andreas Schildbach:<ul class=3D"" =
style=3D"padding-left: 20px; margin-left: 0px; list-style-type: =
disc;"><li style=3D"padding: 5px 0px; line-height: 1.5em;">We are now =
BIP62 (canonical push encodings) compliant.</li><li style=3D"padding: =
5px 0px; line-height: 1.5em;">A new Coin class replaces usage of =
BigInteger for marking values that are quantities of bitcoin. Formatting =
has moved into the new MonetaryFormat class.</li><li style=3D"padding: =
5px 0px; line-height: 1.5em;">The wallet now saves the fee paid on =
transactions we calculated ourselves. This is useful for putting it into =
a wallet user interface.</li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">Transactions can have user memos and exchange rates attached, =
that will be saved by the wallet.</li><li style=3D"padding: 5px 0px; =
line-height: 1.5em;">Support for decrypting BIP 38 protected private =
keys has been added.</li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">Checkpoints can now be stored textually as well as in the old =
binary format.</li></ul></li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">There is also a new BtcFormat API that provides an alternative =
to MonetaryFormat that plugs in to the java.text framework.</li><li =
style=3D"padding: 5px 0px; line-height: 1.5em;">Added new DNS seed from =
Addy Yeow.</li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">Wallets can now have string-&gt;byte[] mappings attached to =
them, for lighter weight extensions.</li><li style=3D"padding: 5px 0px; =
line-height: 1.5em;">Thanks to Richard Green, there is now a Python =
version of the ForwardingService program from the getting started =
tutorial. This shows how to use bitcoinj from Python using the Jython =
interpreter.</li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">bitcoinj now probes localhost for a Bitcoin node and =
automatically uses that instead of the P2P network, when present. This =
means any bitcoinj based app can be easily upgraded from SPV to full =
security just by running Core at the same time: no setup needed.</li><li =
style=3D"padding: 5px 0px; line-height: 1.5em;">Thanks to Michael =
Bumann, there are now more example apps showing how to use parts of the =
API.</li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">WalletTemplate/WalletAppKit improvements. WalletTemplate is a =
demo app that shows how to create a cross-platform GUI wallet with a =
modern style and 60fps animations. WalletAppKit is a very high level API =
for creating apps that have a Bitcoin wallet:<ul class=3D"" =
style=3D"padding-left: 20px; margin-left: 0px; list-style-type: =
disc;"><li style=3D"padding: 5px 0px; line-height: 1.5em;">Now supports =
mnemonic code and restore from seed words. A date picker is provided to =
cut down on the amount of chain that needs to be rescanned.</li><li =
style=3D"padding: 5px 0px; line-height: 1.5em;">Support for encrypting =
wallets. Password is requested when needed. The difficulty of the scrypt =
function is selected to always take a fixed number of seconds even if =
hardware gets more powerful.</li><li style=3D"padding: 5px 0px; =
line-height: 1.5em;">Some new animation and utility code backported from =
Lighthouse.</li><li style=3D"padding: 5px 0px; line-height: 1.5em;">Tor =
support</li></ul></li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">Thanks to Martin Zachrison, the micropayment channels =
implementation has received various improvements.</li><li =
style=3D"padding: 5px 0px; line-height: 1.5em;">Thanks to Eric Tierney =
(Circle), the Postgres store can now take a custom schema.</li><li =
style=3D"padding: 5px 0px; line-height: 1.5em;">The Bloom filtering API =
has been extended so FilteredBlock objects can now be produced from =
Block objects given a BloomFilter. Previously there was support for =
client-side Bloom usage but no implementation of the generation =
part.</li><li style=3D"padding: 5px 0px; line-height: 1.5em;">Many other =
bugfixes, cleanups, minor tweaks and small new APIs.</li></ul><p =
class=3D"" style=3D"line-height: 1.5em; color: rgb(100, 100, 100); =
font-family: NanLight, sans-serif;"><b class=3D"">Documentation and =
tutorials</b></p><ul class=3D"" style=3D"padding-left: 20px; =
margin-left: 0px; color: rgb(100, 100, 100); font-family: NanLight, =
sans-serif;"><li style=3D"padding: 5px 0px; line-height: =
1.5em;">A&nbsp;<a href=3D"https://bitcoinj.github.io/getting-started-js" =
class=3D"">JavaScript tutorial</a>&nbsp;has been added, showing how to =
use bitcoinj from this language. More tutorials in other languages will =
come in future.</li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">The =93<a =
href=3D"https://bitcoinj.github.io/working-with-the-wallet" =
class=3D"">Working with the wallet</a>=94 document has been =
significantly extended to cover encryption, watching wallets, HD wallets =
and multisig/married wallets.</li><li style=3D"padding: 5px 0px; =
line-height: 1.5em;">A&nbsp;<a =
href=3D"https://bitcoinj.github.io/simple-gui-wallet" class=3D"">new =
document and accompanying screencast</a>&nbsp;shows how to extend the =
WalletTemplate app to have a transactions list, and then make a =
native/bundled packages that don=92t need the user to install Java. By =
following this tutorial you will learn how to make a basic cross =
platform desktop wallet of your own.</li><li style=3D"padding: 5px 0px; =
line-height: 1.5em;">All other docs were refreshed to the latest =
APIs.</li></ul><p class=3D"" style=3D"line-height: 1.5em; color: =
rgb(100, 100, 100); font-family: NanLight, sans-serif;"><b class=3D"">API =
changes</b></p><ul class=3D"" style=3D"padding-left: 20px; margin-left: =
0px; color: rgb(100, 100, 100); font-family: NanLight, sans-serif;"><li =
style=3D"padding: 5px 0px; line-height: 1.5em;">The package name has =
changed to org.bitcoinj and the core Maven artifact name is now =
=93bitcoinj-core=94. You can auto-port most of your code by =
running&nbsp;<code class=3D"" style=3D"font-family: monospace, =
monospace; padding: 2px 4px; border: 1px solid rgb(204, 204, 204); =
background-color: rgb(245, 245, 245);">find . -name '*.java' \| xargs =
sed -i .bak 's/com.google.bitcoin./import org.bitcoinj./g</code></li><li =
style=3D"padding: 5px 0px; line-height: 1.5em;">Wallet.completeTx now =
throws more precise unchecked exceptions in edge cases, instead of =
IllegalArgumentException.</li><li style=3D"padding: 5px 0px; =
line-height: 1.5em;">The use of BigInteger to represent quantities of =
Bitcoin has been replaced with the more efficient, type safe and useful =
class Coin. Coin is mostly source compatible with BigInteger so you can =
probably just do a search and replace to update your codebase. =
Utils.bitcoinValueToFriendlyString and friends moved to =
CoinFormat.</li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">NetworkParameters.getProofOfWorkLimit was renamed to =
getMaxTarget for consistency with other Bitcoin codebases.</li><li =
style=3D"padding: 5px 0px; line-height: 1.5em;">The library no longer =
uses the misleading term =93nanocoins=94 to mean satoshis (the old term =
predated the use of the word satoshi to describe the smallest possible =
amount of bitcoin).</li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">TransactionConfidence no longer tracks total work done.</li><li =
style=3D"padding: 5px 0px; line-height: 1.5em;">Because outputs are now =
shuffled any code during that assumes the ordering is preserved will =
break. You can set the shuffleOutputs field of SendRequest to false to =
disable this behaviour if you need to.</li><li style=3D"padding: 5px =
0px; line-height: 1.5em;">The ECKey and HD API=92s have changed quite a =
bit: several constructors were replaced with clearer static factory =
methods that make it more obvious how their parameters are interpreted. =
The new methods don=92t change their behaviour depending on the pattern =
of nulls passed into them.</li><li style=3D"padding: 5px 0px; =
line-height: 1.5em;">Some unit testing utilities have been moved to the =
new testing subpackage and cleaned up/rearranged. It should be easier to =
write unit tests for your app that need a simulated network now. =
DeterministicKey now derives from ECKey.</li><li style=3D"padding: 5px =
0px; line-height: 1.5em;">We now use Utils.HEX.encode() and =
Utils.HEX.decode() to do translation to and from base 16.</li><li =
style=3D"padding: 5px 0px; line-height: =
1.5em;">Transaction.hashTransactionForSignature was renamed to just =
hashForSignature.</li><li style=3D"padding: 5px 0px; line-height: =
1.5em;">The subVer string sent by bitcoinj now has a lower cased first =
component.</li></ul></div><div><br></div></body></html>=

--Apple-Mail=_4CE7191A-91B4-4D75-98D8-A4CF7F12F95C--

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