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1  Bitcoin / Electrum / Obelisk: An Electrum server using libbitcoin on: April 09, 2021, 10:10:26 AM
I've been working on an Electrum server implementation that uses ZeroMQ and libbitcoin as its backend so that I can use Electrum with my libbitcoin node/server.
It is written with using libbitcoin v4 in mind, so with public servers, only testnet is available because v4 is not yet finished, or if you have your own mainnet v4 server, then you can use mainnet.

The code can be found here:

In total, it's about 1000 lines of Python code, which is relatively straightforward. This means it's 10 times smaller than ElectrumX for example.

If you're interested, I'd appreciate some feedback, help, and code review  Cheesy

Happy hacking!
2  Other / Off-topic / Time machine/time travel on: March 21, 2021, 08:18:10 AM
Looking for someone offering cheap time travel that goes backwards (past time).


Signature campaign abusers be like:

3  Bitcoin / Bitcoin Discussion / Is it just me or has the entry bar become a lot higher? on: June 20, 2020, 10:33:02 PM
After about five years of not touching Bitcoin, I notice that it became quite difficult to acquire BTC and get (back) into crypto compared to what it was like some years ago. Registering on an exchange and trying to deposit money has lead me into plenty of rabbit holes where I was requested different ways of identity verification which aren't quite comfortable per-se. Moreover, it seems that more and more regulations are in place and it's not as easy as it once was. Mining aside, I think things are getting difficult in a way, and it provokes certain thoughts. Thoughs of Bitcoin being more exclusive than it ever was.

Is it just me, or are people really ready to give out their identity just to buy some Bitcoins on an online exchange?
4  Economy / Games and rounds / Free ZNC accounts on: December 26, 2015, 10:45:31 PM

So, if you're in need of ZNC, post here. This is my Christmas gift to Bitcointalk members.
I'll PM the first 10 people to  get your info and you'll then get an account.

The ZNC server is on my personal webserver and you should experience minimal downtime.
I allow all IRC networks.
5  Economy / Economics / Bitcoin can not replace fiat on: December 23, 2015, 02:54:15 PM
Yes, got you intrigued, didn't it?

Bitcoin is a very good thing to have as an asset. Just like gold. Even better if I may say. It's secure, and unlike fiat money it actually exists and work is put into it to produce it. This makes it great to store value.
However, it cannot and will not replace current fiat money that the entire world it using. It just cannot.
Take paying a cup of coffee for example. To pay your coffee with bitcoins, one must get bitcoins first, either by mining or buying bitcoins with other kinds of money (*cough*fiat*cough). It ends up being a quite complicated process, don't you think?
Until we reach the point where paying for a cup of coffee is as easy with Bitcoin as it is with cash, we will never get mass adoption. And as far as I see it, there is no way of simplifying the acquiring of bitcoins.
6  Local / Trgovina / Trebam nekoga da mi kupi laptop na eBayu, placam u BTC on: November 25, 2015, 10:50:11 AM
Pozdrav ekipa!
Jel itko voljan da mi naruci jedan laptop s eBaya, u Nizozemsku... Tu Nizozemci koje znam ni ne zele cut za Bitcoin Cheesy

Pa ako ste zainteresirani, javite mi. Hvala!

7  Local / Markt / [WTB] Thinkpad Laptop on: November 24, 2015, 08:40:50 AM

I am looking to buy a Thinkpad laptop in Amsterdam or somewhere near around. It has to be no more than 14.1" screen size, and screen must be widescreen.

Also willing to trade a HP laptop with very good, recent hardware.

Anyone got a thinkpad?  Cheesy
8  Economy / Computer hardware / [WTB] Lenovo Thinkpad on: November 23, 2015, 02:45:18 PM
I'm looking for a Thinkpad laptop... Has to have matte top color, and to be widescreen.

Show me your offers Smiley

P.S. I'm in Amsterdam, NL.
9  Economy / Services / Will work for BTC on: November 15, 2015, 12:21:18 PM
Hi there!

I'm a freelancer, and my line of work is web design, web development, software design/development, graphic design, audio/video production and editing, linux system administration and engineering, and more...

If you're in need of any, do PM me or post here. I will reply as soon as I can.

If you've any questions, feel free to ask.  Wink

There's a homepage I have too Cheesy
10  Other / Meta / Forum dying? on: November 06, 2015, 12:05:56 PM
I've been experiencing so much 502 Bad Gateway errors lately. Plus, the forum works really slow for me (when it works).
Today usually I need to refresh a page 2-3 times in order for it to open, and when it does, takes ages to load completely.
All other websites work fine for me.

Anyone experiencing this lately?

There was a problem on the server causing this. I fixed it.
11  Other / New forum software / [Feature Req] Profile Text on: November 04, 2015, 03:55:38 PM
I was thinking of a personalized text box on members' profiles. Something like a profile info, or "about me"
Stylable with BBcode, and maybe a 10k char limit.

Just something we could write for the visitors of our profiles, like some info. Not everything fits in our signatures. Plus, signatures can get annoying.
12  Local / Off-topic (Hrvatski) / Sretan Uskrs on: April 06, 2015, 08:08:47 AM
Sretan Uskrs svima, zelim vam sve najljepse. Smiley
13  Other / Archival / IRC - #bitcoin-hr on: February 18, 2015, 02:33:08 PM
Mozete i chatati na nasem IRC kanalu Smiley. Kanal je #bitcoin-hr na freenode mrezi.

Spojite se preko:
  • - 6665, 6666, 6667 6665, 6666, 6667, 8000, 8001, 8002
  • - 6697, 7000, 7070 - (SSL)
  • frxleqtzgvwkv7oz.onion - 6667
  • frxleqtzgvwkv7oz.onion - 6697, 7000, 7070 - (SSL)

Vise informacija ovdje:

Besplatni IRC bouncer (ZNC) mozete koristiti ovdje:

Founder sam #bitcoin-hr kanala pa me slobodno pitajte za sve sto vam je potrebno.
Pravila IRC kanala
  • Bez ikakvih uvreda na vjerskoj, rasnoj, ustvari bilo kakvoj osnovi.
  • Bez zicanja novca/bitcoina
  • Nisu dopustene ilegalne aktivnosti
  • Nisu dopusteni IRC botovi koji spamaju kanal nepotrebnim stvarima

Bilo kakvo nepostivanje pravila ce rezultirati udaljavanjem s IRC kanala.

Bot na kanalu je supybot pa se moze i proguglat malo o njemu.

/query paradiddle
S list izlistas komande, a s help vidi sta rade.

U kanalu ga mozes pozvat ako pocnes svoju poruku sa usklicnikom (!) i neka komanda.
!math calc sqrt(pi)
14  Other / Meta / Bring back Newbie Jail on: January 14, 2015, 11:58:00 AM
This may just be considered as a rant...

I'd like to see the old Newbie Jail brought back up and running. There's been way too much newbie accounts spamming all around the forums with all kinds of schemes, asking for loans and what the hell not.

For those that aren't familiar with the term "Newbie Jail":
It's the only subsection of the forum where newbies can post for a certain amount of time and/or until you get a required amount of posts.

This used to exist, and was requested a few times again. I'd like to request it again.

Some ideas for the jail:
  • Able to get out of jail when Jr. Member status achieved
  • Able to get out of jail earlier if 2+ members confirm it somehow
  • A button that ignores all the newbies in the forum and automatically unignores them when they go past the Newbie status

I know this might make the forum seem like some kind of an "elitist" place, but there's just too much people crowding up the forum with all kinds of crap.
15  Other / Off-topic / I'm paranoid on: January 12, 2015, 08:45:32 PM
Just a few moments ago, I got deauthed from my WiFi connection.

I open wicd to reconnect, and see another WiFi AP with the same ESSID as mine and even on the same channel as mine., and I'm like WTF!?
The faux AP is unsecured (mine uses WPA2), and has this MAC address: e8:4e:06:11:00:32

Should I be worried?
16  Economy / Speculation / Bitstamp's stolen BTC on the move on: January 07, 2015, 10:02:08 AM

Looks like they've started their journey.

What do you think? Expect a dump soon?
17  Local / Off-topic (Hrvatski) / Sretna nova 2015. on: December 31, 2014, 11:32:09 PM
Cestitam! Sve najbolje zelim vama i vasim obiteljima.

A sad se proveselite, znam da ja ocu Grin
18  Bitcoin / Bitcoin Discussion / Bitcoin Core 0.10.0rc1 has been released on: December 28, 2014, 11:26:52 AM
Bitcoin Core version 0.10.0 is now available from:

This is a new major version release, bringing both new features and bug fixes.

Please report bugs using the issue tracker at github:

Upgrading and downgrading
How to Upgrade

If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), then run the installer (on Windows) or just copy over /Applications/Bitcoin-Qt (on Mac) or bitcoind/bitcoin-qt (on Linux).

If you are upgrading from version 0.7.2 or earlier, the first time you run 0.10.0 your blockchain files will be re-indexed, which will take anywhere from 30 minutes to several hours, depending on the speed of your machine.
Downgrading warning

Because release 0.10.0 makes use of headers-first synchronization and parallel block download (see further), the block files and databases are not backwards-compatible with older versions of Bitcoin Core:

    Blocks will be stored on disk out of order (in the order they are received, really), which makes it incompatible with some tools or other programs. Reindexing using earlier versions will also not work anymore as a result of this.

    The block index database will now hold headers for which no block is stored on disk, which earlier versions won't support.

If you want to be able to downgrade smoothly, make a backup of your entire data directory. Without this your node will need start syncing (or importing from bootstrap.dat) anew afterwards.

This does not affect wallet forward or backward compatibility.
Notable changes
Faster synchronization

Bitcoin Core now uses 'headers-first synchronization'. This means that we first ask peers for block headers (a total of 27 megabytes, as of December 2014) and validate those. In a second stage, when the headers have been discovered, we download the blocks. However, as we already know about the whole chain in advance, the blocks can be downloaded in parallel from all available peers.

In practice, this means a much faster and more robust synchronization. On recent hardware with a decent network link, it can be as little as 3 hours for an initial full synchronization. You may notice a slower progress in the very first few minutes, when headers are still being fetched and verified, but it should gain speed afterwards.

A few RPCs were added/updated as a result of this:

    getblockchaininfo now returns the number of validated headers in addition to the number of validated blocks.
    getpeerinfo lists both the number of blocks and headers we know we have in common with each peer. While synchronizing, the heights of the blocks that we have requested from peers (but haven't received yet) are also listed as 'inflight'.
    A new RPC getchaintips lists all known branches of the block chain, including those we only have headers for.

Transaction fee changes

This release automatically estimates how high a transaction fee (or how high a priority) transactions require to be confirmed quickly. The default settings will create transactions that confirm quickly; see the new 'txconfirmtarget' setting to control the tradeoff between fees and confirmation times.

Prior releases used hard-coded fees (and priorities), and would sometimes create transactions that took a very long time to confirm.

Statistics used to estimate fees and priorities are saved in the data directory in the fee_estimates.dat file just before program shutdown, and are read in at startup.

New command line options for fee estimation:

    -txconfirmtarget=n : create transactions that have enough fees (or priority) so they are likely to confirm within n blocks (default: 1). This setting is over-ridden by the -paytxfee option.

New RPC commands for fee estimation:

    estimatefee nblocks : Returns approximate fee-per-1,000-bytes needed for a transaction to be confirmed within nblocks. Returns -1 if not enough transactions have been observed to compute a good estimate.
    estimatepriority nblocks : Returns approximate priority needed for a zero-fee transaction to confirm within nblocks. Returns -1 if not enough free transactions have been observed to compute a good estimate.

RPC access control changes

Subnet matching for the purpose of access control is now done by matching the binary network address, instead of with string wildcard matching. For the user this means that -rpcallowip takes a subnet specification, which can be

    a single IP address (e.g. or fe80::0012:3456:789a:bcde)
    a network/CIDR (e.g. or fe80::0000/64)
    a network/netmask (e.g. or fe80::0012:3456:789a:bcde/ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff)

An arbitrary number of -rpcallow arguments can be given. An incoming connection will be accepted if its origin address matches one of them.

REST interface

A new HTTP API is exposed when running with the -rest flag, which allows unauthenticated access to public node data.

It is served on the same port as RPC, but does not need a password, and uses plain HTTP instead of JSON-RPC.

Assuming a local RPC server running on port 8332, it is possible to request:

    Blocks: http://localhost:8332/rest/block/HASH.EXT
    Blocks without transactions: http://localhost:8332/block/notxdetails/HASH.EXT
    Transactions (requires -txindex): http://localhost:8332/tx/HASH.EXT

In every case, EXT can be bin (for raw binary data), hex (for hex-encoded binary) or json.

For more details, see the doc/ document in the repository.
RPC Server "Warm-Up" Mode

The RPC server is started earlier now, before most of the expensive intialisations like loading the block index. It is available now almost immediately after starting the process. However, until all initialisations are done, it always returns an immediate error with code -28 to all calls.

This new behaviour can be useful for clients to know that a server is already started and will be available soon (for instance, so that they do not have to start it themselves).
Improved signing security

For 0.10 the security of signing against unusual attacks has been improved by making the signatures constant time and deterministic.

This change is a result of switching signing to use libsecp256k1 instead of OpenSSL. Libsecp256k1 is a cryptographic library optimized for the curve Bitcoin uses which was created by Bitcoin Core developer Pieter Wuille.

There exist attacks[1] against most ECC implementations where an attacker on shared virtual machine hardware could extract a private key if they could cause a target to sign using the same key hundreds of times. While using shared hosts and reusing keys are inadvisable for other reasons, it's a better practice to avoid the exposure.

OpenSSL has code in their source repository for derandomization and reduction in timing leaks, and we've eagerly wanted to use it for a long time but this functionality has still not made its way into a released version of OpenSSL. Libsecp256k1 achieves significantly stronger protection: As far as we're aware this is the only deployed implementation of constant time signing for the curve Bitcoin uses and we have reason to believe that libsecp256k1 is better tested and more thoroughly reviewed than the implementation in OpenSSL.

Watch-only addresses in the wallet

The wallet can now track transactions to addresses (or scripts) for which you do not have the private keys.

This can be used to track payments without needing the private keys online on a possibly vulnerable system. In addition, it can help for (manual) construction of multisig transactions where you are only one of the signers.

One new RPC, importaddress, is added which functions similarly to importprivkey, but instead takes an address or script (in hexadecimal) as argument. After using it, outputs credited to this address or script are considered to be yours.

The following RPCs have optional support for watch-only addresses: getbalance, listreceivedbyaddress, listreceivedbyaccount, listtransactions, listaccounts, listsinceblock, gettransaction. See the RPC documentation for those methods for more information.

Compared to using getrawtransaction, this mechanism does not require -txindex, scales better, integrates better with the wallet, and is compatible with future block chain pruning functionality. It does mean the address needs to added to the wallet before the payment, though.
Consensus library

Starting from 0.10.0, the Bitcoin Core distribution includes a consensus library.

The purpose of this library is to make the verification functionality that is critical to Bitcoin's consensus available to other applications, e.g. to language bindings such as python_bitcoinlib or alternative node implementations.

This library is called (or, .dll for Windows). Its interface is defined in the C header bitcoinconsensus.h.

In its initial version the API includes two functions:

    bitcoinconsensus_verify_script verifies a script. It returns whether the indicated input of the provided serialized transaction correctly spends the passed scriptPubKey under additional constraints indicated by flags
    bitcoinconsensus_version returns the API version, currently at an experimental 0

The functionality is planned to be extended to e.g. UTXO management in upcoming releases, but the interface for existing methods should remain stable.
Standard script rules relaxed for P2SH addresses

The IsStandard() rules have been almost completely removed for P2SH redemption scripts, allowing applications to make use of any valid script type, such as "n-of-m OR y", hash-locked oracle addresses, etc. While the Bitcoin protocol has always supported these types of script, actually using them on mainnet has been previously inconvenient as standard Bitcoin Core nodes wouldn't relay them to miners, nor would most miners include them in blocks they mined.

It has been observed that many of the RPC functions offered by bitcoind are "pure functions", and operate independently of the bitcoind wallet. This included many of the RPC "raw transaction" API functions, such as createrawtransaction.

bitcoin-tx is a newly introduced command line utility designed to enable easy manipulation of bitcoin transactions. A summary of its operation may be obtained via "bitcoin-tx --help" Transactions may be created or signed in a manner similar to the RPC raw tx API. Transactions may be updated, deleting inputs or outputs, or appending new inputs and outputs. Custom scripts may be easily composed using a simple text notation, borrowed from the bitcoin test suite.

This tool may be used for experimenting with new transaction types, signing multi-party transactions, and many other uses. Long term, the goal is to deprecate and remove "pure function" RPC API calls, as those do not require a server round-trip to execute.

Other utilities "bitcoin-key" and "bitcoin-script" have been proposed, making key and script operations easily accessible via command line.


Thanks to everyone who contributed to this release:

    Adam Weiss
    Aitor Pazos
    Alexander Jeng
    Alex Morcos
    Alon Muroch
    Andreas Schildbach
    Andrew Poelstra
    Andy Alness
    Ashley Holman
    Benedict Chan
    Ben Holden-Crowther
    Bryan Bishop
    Christian von Roques
    Clinton Christian
    Cory Fields
    Cozz Lovan
    Daniel Kraft
    David Hill
    Dominyk Tiller
    Eric Shaw
    Federico Bond
    Francis GASCHET
    Gavin Andresen
    Giuseppe Mazzotta
    Glenn Willen
    Gregory Maxwell
    Huang Le
    Ian Carroll
    Jameson Lopp
    Janusz Lenar
    Jeff Garzik
    Johnathan Corgan
    Jonas Schnelli
    Julian Haight
    Kamil Domanski
    Kosta Zertsekel
    Luke Dashjr
    Mark Friedenbach
    Mathy Vanvoorden
    Matt Corallo
    Matthew Bogosian
    Michael Ford
    Mike Hearn
    Otto Allmendinger
    Pavel Vasin
    Peter Todd
    Philip Kaufmann
    Pieter Wuille
    R E Broadley
    Rose Toomey
    Ross Nicoll
    Roy Badami
    Ruben Dario Ponticelli
    Rune K. Svendsen
    Ryan X. Charles
    Stuart Cardall
    Suhas Daftuar
    Tawanda Kembo
    Teran McKinney
    Tom Harding
    Trevin Hofmann
    Whit J
    Wladimir J. van der Laan
    Yoichi Hirai
    Zak Wilcox

As well as everyone that helped translating on Transifex.

View full log at:
19  Local / Hrvatski (Croatian) / Predstavite se on: December 21, 2014, 09:13:35 PM
Ako ste novi, ili ako vec neko vrijeme sudjelujete u raspravama a zelite se "sluzbeno" predstavit, evo prilike Cheesy

Evo par linkova koje vam preporucam da procitate ako ste pridoslica:

20  Local / Hrvatski (Croatian) / Trejdate li? Gdje? on: December 18, 2014, 02:54:39 PM
Ja trenutno u Splitu (BitKonan). Cijena im je inace visa od prosjeka ostalih marketa, a i lova brzo sjedne.

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