libbitcoin

[Red Emerald]

I've managed to get libbitcoin built on osx!  I'm still having trouble with obelisk and sx, but libbitcoin and pybitcointools seem to be working!

https://github.com/WyseNynja/homebrew-bitcoin

[ngenko]

I find this initiative very interesting, especially with respect to what is happening at the foundation and the regulator going to put pressure on the bitcoin community.

I'm not a developer, so I cannot really help you guys in enhancing the implementation. However, I would be happy to use my BFL miner to mine libbitcoins.

As far as I understood, there is no mining pool and nothing plug-and-play to start mining libbitcoin.
Is there any plan to realase it?

[lclc]

However, I would be happy to use my BFL miner to mine libbitcoins.
As far as I understood, there is no mining pool and nothing plug-and-play to start mining libbitcoin.
Is there any plan to realase it?

I think you misunderstand libbitcoin. It's not a altcoin, it's a alternative implementation of Bitcoin but with the same blockchain, same protocol etc etc.
So it's the same Bitcoin, the same coins.
It's still a very important project (more important than yet another altcoin) as it is absolutely independent from the foundation.
You might just donate some of the mined Bitcoins you made to the DarkWallet fundraising, which is also from them (and using libbitcoin as a server-backend) to support it.

[ngenko]

I think you misunderstand libbitcoin. It's not a altcoin, it's a alternative implementation of Bitcoin but with the same blockchain, same protocol etc etc.
So it's the same Bitcoin, the same coins.
It's still a very important project (more important than yet another altcoin) as it is absolutely independent from the foundation.
You might just donate some of the mined Bitcoins you made to the DarkWallet fundraising, which is also from them (and using libbitcoin as a server-backend) to support it.

Right, there is something that I misunderstand then. If it's an alternative implementation but with the same blockchain, what does it mean?
using libbitcoin means using another wallet than the official one (using darkwallet instead of Multibit?)?

[MoonShadow]

I think you misunderstand libbitcoin. It's not a altcoin, it's a alternative implementation of Bitcoin but with the same blockchain, same protocol etc etc.
So it's the same Bitcoin, the same coins.
It's still a very important project (more important than yet another altcoin) as it is absolutely independent from the foundation.
You might just donate some of the mined Bitcoins you made to the DarkWallet fundraising, which is also from them (and using libbitcoin as a server-backend) to support it.

Right, there is something that I misunderstand then. If it's an alternative implementation but with the same blockchain, what does it mean?
using libbitcoin means using another wallet than the official one (using darkwallet instead of Multibit?)?

libbitcoin is a programming library for bitcoin client functions.  It's not a client unto itself, but makes the building of clients easier and more uniform.  Darkwallet is, indeed, based upon libbitcoin.

[RayG]

Has anyone ever managed to build libbitcoin library for Windows? I'm offering 0.5 BTC for working solution here https://bitcointalk.org/index.php?topic=358298.0.

[genjix]

New library for interfacing with Obelisk servers and doing Bitcoin functionality.

Pure Python so library is easily portable to platforms that can run a Python interpreter.

https://bitcointalk.org/index.php?topic=354607

https://github.com/darkwallet/python-obelisk/

See examples/ directory.

This is a collaboration between Pablo Martin's ZMQ/Obelisk implementation, Robert Williamson's blockalchemy library and code from ThomasV's Electrum.

Obelisk is a scalable blockchain query infrastructure. See the setup guide. There is a public server available at 37.139.11.99:9091 but I wouldn't use it for anything production (besides testing).

A pure Python library is great because it can be deployed easily without requiring dependencies. This allows code to be ported across many platforms such as the mobile phone with Kivy, desktops or any platform running Python.

Features:

* Blockchain queries and navigation through Obelisk servers.
* Construct & sign transactions.
* BIP32 hierarchical wallet.
* Traverse the blockchain using a syntax similar to Django ORM / SQL alchemy.

Use cases:

* Website payment backend (store and manage the keys yourself).
* Wallet software.

[genjix]

I've created a new library which will have non-critical code (like
deterministic wallets, key formats and selecting outputs) ported from
libbitcoin to libwallet.

This will keep libbitcoin focused on its core functionality. The client
side stuff is less important considering all the wallet development done
in Python, JavaScript .etc libbitcoin is aimed at server software.

https://github.com/spesmilo/libwallet

The install-sx.sh has been updated to reflect this. Users simply need to
re-run the script to update.

-------------

BTW we have a mailing list: https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/libbitcoin

[genjix]

Hi!

I've made significant performance increases for the blockchain by creating a custom database that outperforms the more conventional LevelDB. This is still a work in progress and won't be in libbitcoin at least for some time. You can read more about more research here:

https://wiki.unsystem.net/index.php/Libbitcoin/Blockchain

More optimisation is possible too.

Writes:



Reads:

[maaku]

genjix, your wiki is incorrect. LevelDB is a log-structured merge tree which is an append-only data structure periodically compacted into new files. I just took a cursory glance, but mmht looks like it would have similar performance characteristics. Have you benchmarked HyperLevelDB? I would expect that the difference in performance is probably mostly due to *LevelDB's compaction and durability features (which aren't something you can hand-wave away.. I don't want my server to suddenly go down for 24 hours because the db got corrupted and it has to resync the block chain).

[genjix]

blaa blaa blaa *I just took a cursory glance* blaa blaa blaa

http://symas.com/is-lmdb-a-leveldb-killer/

[lclc]

Looks good, I'll try it.

Do you know RocksDB?  Facebook tooked LevelDB and made some improvements that it runs faster on system with less memory. Maybe you can find some ideas there too: http://rocksdb.org/
I don't understands DB internals, just read it in the news.

[Mike Hearn]

maaku is correct that LevelDB does not use b-trees internally. Your wiki claims that it does.

[genjix]

https://wiki.unsystem.net/index.php/Libbitcoin/Open_tasks

feel free to send me an email <myusername>@riseup.net

[genjix]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi!

I've just released new versions of libbitcoin, obelisk, and sx.
This marks the first major release of Obelisk and SX. The version number
of libbitcoin has been bumped to 2.0, and I recommend everyone to upgrade.
This release has important bug fixes and code quality improvements.
I strongly recommend people to upgrade Obelisk if they were running the
unstable tarball.

These packages will be maintained for some time, with bug fixes backported.
I'll also help with upgrading code to newer versions as the API changes
(just send me a message).

sha256sum of tarballs:

3dfcf1cbe12c1d04443f1a467302e4a7ddd81a9e5afe16a3eae3bfdfd921e0be  libbitcoin-2.0.tar.bz2
940782033118e65a44a645291bfb5def96b7b423933e4de330c9d9852a4c166d  libwallet-0.4.tar.bz2
8a76e2075f6488bc8bc6487e09d9485986304c939945771102a92859d2bf0f42  obelisk-1.0.tar.bz2
3dc8688a511c9f5d698920ee2d47ae81c7dfd76f80307a1b97a04cbbebb07746  sx-1.0.tar.bz2

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[genjix]

WARNING: I just upgraded libbitcoin to new style compressed public keys. This will produce incompatibility with generating addresses on old-style Electrum deterministic wallets. Generating private keys is still fine, but the addresses will look different. I suggest moving funds off your wallet before upgrading and then moving them back after.

Anyone who needs the old style uncompressed keys, can use the latest libbitcoin tarball release off the website rather than the Git repo.

[grux]

Can I apply github flavored markdown to make fancy it up, like on bitcoin's github repo?

[Red Emerald]

I'm trying to get this working on OS X again now that new versions are out.

https://github.com/WyseNynja/homebrew-bitcoin/issues/19
https://github.com/WyseNynja/homebrew-bitcoin/issues/20
https://github.com/WyseNynja/homebrew-bitcoin/issues/21

[Prayer]

I'm trying to build libbitcoin on FreeBSD 10.  I gave up on clang due to several issues in the source (missing braces and such) and installed gcc 4.9.

Things are looking a bit better, but I'm running into a different problem.  This isn't libbitcoin specific, but this is the source I'm trying to build and haven't had any luck with google.

In network.lo, I get an error that to_string is not a member of std.  I verified this to be a gcc problem by making a small test file and compiling it with various options.  None are working, but I can compile cleanly with clang.

Any pointers on how to build on FreeBSD (with clang or gcc)?

Thanks,

[genjix]

I'm trying to build libbitcoin on FreeBSD 10.  I gave up on clang due to several issues in the source (missing braces and such) and installed gcc 4.9.

Things are looking a bit better, but I'm running into a different problem.  This isn't libbitcoin specific, but this is the source I'm trying to build and haven't had any luck with google.

In network.lo, I get an error that to_string is not a member of std.  I verified this to be a gcc problem by making a small test file and compiling it with various options.  None are working, but I can compile cleanly with clang.

Any pointers on how to build on FreeBSD (with clang or gcc)?

Thanks,

Are you able to provide a virtual machine image for me to take a look? BTW I'm genjix on #darkwallet on Freenode IRC