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Bitcoin Source Code Explained

Bitcoin Gold, The Latest Bitcoin Fork, Explained

Bitcoin Gold, The Latest Bitcoin Fork, Explained

Bitcoin Gold, the latest Bitcoin fork, explained Bitcoin is dominated by big mining companies. Bitcoin Gold wants to change that. A new cryptocurrency called Bitcoin Gold is now live on the Internet. It aims to correct what its backers see as a serious flaw in the design of the original Bitcoin. There are hundreds of cryptocurrencies on the Internet, and many of them are derived from Bitcoin in one way or another.But Bitcoin Goldlike Bitcoin Cash, another Bitcoin spinoff that was created in August is different in two important ways. Bitcoin Gold is branding itself as a version of Bitcoin rather than merely new platforms derived from Bitcoin's source code. It has also chosen to retain Bitcoin's transaction history, which means that, if you owned bitcoins before the fork, you now own an equal amount of "gold" bitcoins. While Bitcoin Cash was designed to resolve Bitcoin's capacity crunch with larger blocks, Bitcoin Gold aims to tackle another of Bitcoin's perceived flaws: the increasing centralization of the mining industry that verifies and secures Bitcoin transactions. The original vision for Bitcoin was that anyone would be able to participate in Bitcoin mining with their personal PCs, earning a bit of extra cash as they helped to support the network. But as Bitcoin became more valuable, people discovered that Bitcoin mining could be done much more efficiently with custom-built application-specific integrated circuits (ASICs). As a result, Bitcoin mining became a specialized and highly concentrated industry. The leading companies in this new industry wield a disproportionate amount of power over the Bitcoin network. Bitcoin Gold aims to dethrone these mining companies by introducing an alternative mining algorithm that's much less susceptible to ASIC-based optimization Continue reading >>

Bitcoin/litecoin Source Code Walkthrough?

Bitcoin/litecoin Source Code Walkthrough?

Bitcoin/Litecoin source code walkthrough? I've wondered if anyone here knew about some thorough bitcoin or litecoin source code walkthrough or tutorials? I've found a topic which would go that direction but it's from 2011. I've googled but it looks like one has to make his own digging from the point 0. Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here. Haven't ever seen any but I suspect its because the code base is a changing one and most coders will just run through it themselves on GitHub anyway. Would be good to see it though as a way to get younger coders involved. DigitX - Building the worlds largest decentralised market for neural networks Website (| Whitepaper (| Twitter (| Etherscan (| Github (The software is incredibly large and complicated. Writing a walkthrough would require much too much time for very little reward. Instead of asking an extremely broad question, you should instead start at the entry point of the program and follow the code yourself. Ask specific questions when you don't understand anything, not ask super broad generic questions. The entry point of bitcoind is here: Continue reading >>

Development - Bitcoin

Development - Bitcoin

Bitcoin is free software and any developer can contribute to the project. Everything you need is in the GitHub repository . Please make sure to read and follow the development process described in the README, as well as to provide good quality code and respect all guidelines. Development discussion takes place on GitHub and the bitcoin-dev mailing list. Less formal development discussion happens on irc.freenode.net #bitcoin-core-dev ( web interface , logs ). To report an issue,please see the bug reporting page. Bitcoin Core is security software that helps protect assets worthbillions of dollars, so every code change needs to be reviewed byexperienced developers. It can take a long time for other developers to review your pullrequests. Remember that all reviewers are taking time away from theirown projects to review your pull requests, so be patient and respectfulof their time. Please also consider helping to review other peoples pull requests. Youdont need to be an expert in Bitcoin, the Bitcoin Core codebase, or C++(although all these things help). There are almost always open pullrequests that any programmer can review. Do you want to begin coding for Bitcoin Core but dont have a specificimprovement in mind? Here are a few ideas: Fix existing issues: the issue tracker is thebest place to find a useful way to contribute to Bitcoin Core.Before starting to write any patches for issues you find, you maywant to comment on the issue to make sure nobody else is alreadyworking on it. Write tests: Bitcoin Core is covered by many tests, but patchesthat improve test coverage are always welcome and are a great way tobuild familiarity with the codebase. See the documentation about automated testing . If you are interested in learning more about the technical details of Bitcoin an Continue reading >>

Bitcoin Core - Bitcoin Wiki

Bitcoin Core - Bitcoin Wiki

Bitcoin Core (formerly Bitcoin-Qt) is the third Bitcoin client , developed by Wladimir J. van der Laan based on the original reference code by Satoshi Nakamoto . [1] [2] [3] It has been bundled with bitcoind since version 0.5. [4] Bitcoin-Qt has been rebranded to Bitcoin Core since version 0.9.0 [5] . Bitcoin Core can be used as a desktop client for regular payments or as a server utility for merchants and other payment services. Source code (and build instructions for supported platforms) can be found at the Bitcoin GitHub page . Compatibility with Linux (both GNOME and KDE), Mac OS X and Windows All functionality of the original wxWidgets client Asks for confirmation before sending coins Clearer transaction list with status icons and real-time filtering Languages: Dutch, English, German, Chinese and many more. Translations are being done by volunteers on Transifex . Sendmany support in UI (send to multiple recipients in one transaction) Multiple unit support, can show subdivided bitcoins (mBTC, BTC) for users that like large numbers (only decimal units) bitcoin-cli as a RPC client, instead of bitcoind executable functioning both as a server and as a RPC client Bitcoin Core is often criticized for being slow in downloading and verifying the Bitcoin transaction database (the blockchain ). The download may be quicker using the bootstrap method . NOTE: As of version 0.10.0 it is now slower to download the blockchain via the torrent than it is to download the full blockchain through the P2P client. It has also been criticized for "hogging" upload bandwidth when peers connect to download the blockchain (possible only when run with port 8333 accessible to outside connections).This perceived "issue" has been discussed extensively on GitHub .Most modern routers support qualit Continue reading >>

How To Compile Bitcoin Source Code In Ubuntu 16.04 Lts

How To Compile Bitcoin Source Code In Ubuntu 16.04 Lts

How to Compile Bitcoin Source Code in Ubuntu 16.04 LTS How to Compile Bitcoin Source Code in Ubuntu 16.04 LTS If you are building some projects around bitcoin then you might have realized that you have to compile the bitcoin source code to create the bitcoindfor your own machine. This is necessary because sometimes the pre-compiled binary do not work as expected and your whole project might become erroneous. It is far better to compile bitcoin by your own and then use it. In this post, I will explain how to compile bitcoin source code on Ubuntu 16.04 LTS. I will be running my Ubuntu instance on AWS though you can follow the same instructions anywhere on Ubuntu 16.04 LTS. Please make sure your server has at least 4 GB of RAM. I am assuming the username is ubuntu (without double quotes) but if your username is something else like root, mark, etc. then please replace ubuntu accordingly. # Update & Upgrade the Systemsudo apt-get updatesudo apt-get upgrade# Install dependencies there might be more based on your system# However below instructions are for the fresh Ubuntu install/server# Please carefully watch the logs because if something could not be install# You have to make sure it is installed properly by trying the command or that particular# dependency againsudo apt-get install build-essential libtool autotools-dev autoconf pkg-config libssl-devsudo apt-get install libboost-all-devsudo apt-get install libqt5gui5 libqt5core5a libqt5dbus5 qttools5-dev qttools5-dev- tools libprotobuf-dev protobuf-compilersudo apt-get install libqrencode-dev autoconf openssl libssl-dev libevent-devsudo apt-get install libminiupnpc-dev# Download Bitcoin Source code# ----------------------------cd ~git clone https:// github .com/ bitcoin / bitcoin .git# Bitcoin uses the Berkley DB 4.8# We ne Continue reading >>

C++ - How To Understand Bitcoin Source Code - Bitcoin Stack Exchange

C++ - How To Understand Bitcoin Source Code - Bitcoin Stack Exchange

I am not a C++ pro. I read C++ as a part of my undergrad school course. I am very passionate about the future currency i.e. Bitcoin. But I don't understand the source code structure. How to read the source code? As I already told I am have very basic knowledge of C++. However, I can google on the way if don't understand something(functions, libraries, headers). The actual problem I am facing is inside src/ directory. I don't understand the flow of files and directories in src/. Which is the first file that I should probably start reading. Can any one explain me all of flow of all the project in some sort of tree like structure? ~/GitHub/bitcoin/src ls masterMakefile.am coincontrol.h miner.h scriptMakefile.bench.include coins.cpp net.cpp secp256k1Makefile.qt.include coins.h net.h serialize.hMakefile.qttest.include compat netbase.cpp streams.hMakefile.test.include compat.h netbase.h supportaddrman.cpp compressor.cpp noui.cpp sync.cppaddrman.h compressor.h noui.h sync.halert.cpp config obj testalert.h consensus obj-test threadsafety.hamount.cpp core_io.h policy timedata.cppamount.h core_memusage.h pow.cpp timedata.harith_uint256.cpp core_read.cpp pow.h tinyformat.harith_uint256.h core_write.cpp prevector.h torcontrol.cppbase58.cpp crypto primitives torcontrol.hbase58.h dbwrapper.cpp protocol.cpp txdb.cppbench dbwrapper.h protocol.h txdb.hbitcoin-cli-res.rc hash.cpp pubkey.cpp txmempool.cppbitcoin-cli.cpp hash.h pubkey.h txmempool.hbitcoin-tx-res.rc httprpc.cpp qt ui_interface.hbitcoin-tx.cpp httprpc.h random.cpp uint256.cppbitcoind-res.rc httpserver.cpp random.h uint256.hbitcoind.cpp httpserver.h rest.cpp undo.hbloom.cpp init.cpp reverselock.h univaluebloom.h init.h rpcblockchain.cpp util.cppchain.cpp key.cpp rpcclient.cpp util.hchain.h key.h rpcclient.h utilmoneystr.cppc Continue reading >>

A Blockchain In 200 Lines Ofcode

A Blockchain In 200 Lines Ofcode

I like programming and Careless Whisper. The basic concept of blockchain is quite simple: a distributed database that maintains a continuously growing list of ordered records. However, it is easy to get mixed up as usually when we talk about blockchains we also talk about the problems we are trying to solve with them. This is the case in the popular blockchain-based projects such as Bitcoin and Ethereum . The term blockchain is usually strongly tied to concepts like transactions , smart contracts or cryptocurrencies . This makes understanding blockchains a necessarily harder task, than it must be. Especially source-code-wisely. Here I will go through a super-simple blockchain I implemented in 200 lines of Javascript called NaiveChain . The first logical step is to decide the block structure. To keep things as simple as possible we include only the most necessary: index, timestamp, data, hash and previous hash. The hash of the previous block must be found in the block to preserve the chain integrity The block needs to be hashed to keep the integrity of the data. A SHA-256 is taken over the content of the block. It should be noted that this hash has nothing to do with mining , since there is no Proof Of Work problem to solve. To generate a block we must know the hash of the previous block and create the rest of the required content (= index, hash, data and timestamp). Block data is something that is provided by the end-user. A in-memory Javascript array is used to store the blockchain. The first block of the blockchain is always a so-called genesis-block, which is hard coded. At any given time we must be able to validate if a block or a chain of blocks are valid in terms of integrity. This is true especially when we receive new blocks from other nodes and must decide whe Continue reading >>

A Gentle Introduction To Bitcoin Core Development

A Gentle Introduction To Bitcoin Core Development

Bitcoin Developer and Entrepreneur/PGP Fingerprint: C1D7 97BE 7D10 5291 228C D70C FAA6 17E3 2679 E455 A Gentle Introduction to Bitcoin Core Development If youre a developer and you own any Bitcoin at all, contributing to Bitcoin Core can be one of the best things you can do to help out your investment. In this article, Im going to give a gentle, step-by-step overview of how to contribute to Core development. Before we get into the actual nitty-gritty of contributing to Core, there are a few caveats to get out of the way. First and foremost, Bitcoin Core is a meritocracy. As a noob, you are unlikely to get a crazy proof-of-work change pull request merged into Core. Like any meritocracy, you start with zero reputation and work your way up. The good news is that nobody cares about your background. Whether youre a 14-year-old in India or a 45-year-old CTO of a Fortune-500 company, the only thing that really matters is the quality of your work. The bad news is that you have to be willing to leave your ego at the door. Nobody cares how many years of experience you have or what great ideas you have for fixing Bitcoin. The quality of your code, reviews, documentation and testing are what count. Second is that you should set your expectations accordingly. Notable Core developers like Pieter Wuille, Cory Fields and Gregory Maxwell have earned their respect through many years of blood, sweat and tears. Adding a PR that corrects a spelling error is not going to win you a Pieter Wuille-level of respect. Good work will earn you recognition and respect, but only after youve been producing for a while. Third is that this is not an easy road. Being the top developer at company X will not necessarily make you a good Core developer. Theres a variety of reasons for this, but in general, y Continue reading >>

Are Here People Who Study Bitcoin Source Code? : Bitcoin

Are Here People Who Study Bitcoin Source Code? : Bitcoin

Do not use URL shortening services: always submit the real link. Begging/asking for bitcoins is absolutely not allowed, no matter how badly you need the bitcoins. Only requests for donations to large, recognized charities are allowed, and only if there is good reason to believe that the person accepting bitcoins on behalf of the charity is trustworthy. News articles that do not contain the word "Bitcoin" are usually off-topic. This subreddit is not about general financial news. Submissions that are mostly about some other cryptocurrency belong elsewhere. For example, /r/CryptoCurrency is a good place to discuss all cryptocurrencies. Promotion of client software which attempts to alter the Bitcoin protocol without overwhelming consensus is not permitted. Trades should usually not be advertised here. For example, submissions like "Buying 100 BTC" or "Selling my computer for bitcoins" do not belong here. /r/Bitcoin is primarily for news and discussion. Please avoid repetition /r/bitcoin is a subreddit devoted to new information and discussion about Bitcoin and its ecosystem. New merchants are welcome to announce their services for Bitcoin, but after those have been announced they are no longer news and should not be re-posted. Aside from new merchant announcements, those interested in advertising to our audience should consider Reddit's self-serve advertising system . Do not post your Bitcoin address unless someone explicitly asks you to. Be aware that Twitter, etc. is full of impersonation. Continue reading >>

Bitcoin - Wikipedia

Bitcoin - Wikipedia

Unspent outputs of transactions denominated in any multiple of satoshis [3] :ch. 5 12.5 bitcoins per block (approximately every ten minutes) until mid 2020, [7] and then afterwards 6.25 bitcoins per block for 4 years until next halving. This halving continues until 2110–40, when 21 million bitcoins will have been issued. ^ The symbol was encoded in Unicode version 10.0 at position U+20BF ₿ BITCOIN SIGN in the Currency Symbols block in June 2017. [2] Bitcoin is a worldwide cryptocurrency and digital payment system [8] :3 called the first decentralized digital currency , as the system works without a central repository or single administrator. [8] :1 [9] It was invented by an unknown person or group of people under the name Satoshi Nakamoto [10] and released as open-source software in 2009. [11] The system is peer-to-peer , and transactions take place between users directly, without an intermediary. [8] :4 These transactions are verified by network nodes and recorded in a public distributed ledger called a blockchain . Bitcoins are created as a reward for a process known as mining . They can be exchanged for other currencies, [12] products, and services. As of February 2015, over 100,000 merchants and vendors accepted bitcoin as payment. [13] Bitcoin can also be held as an investment. According to research produced by Cambridge University in 2017, there are 2.9 to 5.8 million unique users using a cryptocurrency wallet, most of them using bitcoin. [14] The word bitcoin first occurred and was defined in the white paper [15] that was published on 31 October 2008. [16] It is a compound of the words bit and coin . [17] The white paper frequently uses the shorter coin. [15] There is no uniform convention for bitcoin capitalization. Some sources use Bitcoin, capitalized, to Continue reading >>

I Am Trying To Read The Bitcoin Source Code, Again.

I Am Trying To Read The Bitcoin Source Code, Again.

I am trying to read the Bitcoin source code, again. Tell me, in what folder and with what file do I begin? What libraries do I need to know about? I have never written anything this large -- much less read through it. The Communists say, equal labour entitles man to equal enjoyment. No, equal labour does not entitle you to it, but equal enjoyment alone entitles you to equal enjoyment. Enjoy, then you are entitled to enjoyment. But, if you have laboured and let the enjoyment be taken from you, then it serves you right. If you take the enjoyment, it is your right. 12+ exclusive games The Bitcoin Casino by Primedice Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here. use Doxygen ? though it probably depends on how well the code is commented. Generally you start with /src/main.cpp and then follow the execution paths. Alternatively load the project into an IDE that can follow functions, headers, etc. use Doxygen ? though it probably depends on how well the code is commented. Generally you start with /src/main.cpp and then follow the execution paths. Alternatively load the project into an IDE that can follow functions, headers, etc. Righto. Thanks. I really should try studying the syntax of C++ rather than applying prior knowledge from other languages. >_< The Communists say, equal labour entitles man to equal enjoyment. No, equal labour does not entitle you to it, but equal enjoyment alone entitles you to equal enjoyment. Enjoy, then you are entitled to enjoyment. But, if you have laboured and let the enjoyment be taken from you, then it serves you right. If you take the enjoyment, it is your right. It's a big task to read the entire source code in one go. Reading source code "in the abs Continue reading >>

Github - Bitcoin/bitcoin: Bitcoin Core Integration/staging Tree

Github - Bitcoin/bitcoin: Bitcoin Core Integration/staging Tree

Bitcoin is an experimental digital currency that enables instant payments toanyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operatewith no central authority: managing transactions and issuing money are carriedout collectively by the network. Bitcoin Core is the name of open sourcesoftware which enables the use of this currency. For more information, as well as an immediately useable, binary version ofthe Bitcoin Core software, see , or read the original whitepaper . Bitcoin Core is released under the terms of the MIT license. See COPYING for moreinformation or see . The master branch is regularly built and tested, but is not guaranteed to becompletely stable. Tags are createdregularly to indicate new official, stable release versions of Bitcoin Core. The contribution workflow is described in CONTRIBUTING.md . The developer mailing list should be used to discuss complicated or controversial changes before workingon a patch set. Developer IRC can be found on Freenode at #bitcoin-core-dev. Testing and code review is the bottleneck for development; we get more pullrequests than we can review and test on short notice. Please be patient and help out by testingother people's pull requests, and remember this is a security-critical project where any mistake might cost peoplelots of money. Developers are strongly encouraged to write unit tests for new code, and tosubmit new unit tests for old code. Unit tests can be compiled and run(assuming they weren't disabled in configure) with: make check. Further details on runningand extending unit tests can be found in /src/test/README.md . There are also regression and integration tests , writtenin Python, that are run automatically on the build server.These tests can be run (if the test dependencies are installed Continue reading >>

Bitcoincore Development - Where To Find Help Understanding Bitcoin's Source Code In C++? - Bitcoin Stack Exchange

Bitcoincore Development - Where To Find Help Understanding Bitcoin's Source Code In C++? - Bitcoin Stack Exchange

Where to find help understanding Bitcoin's source code in C++? I am looking to understand the Bitcoin C++ source code on GitHub . The Python one is simpler, but even that is too complicated for a beginner. Could someone guide me to some good resources on the actual implementation and its details? The actual C++ techniques used seem to be quite complicated. I am not aware of an extensively commented version of the Bitcoin sourcecode, but you could check out the Bitcoin Developer Reference and you can read online the book Mastering Bitcoin by Andreas M. Antonopoulos, which covers Bitcoin's technical aspects extensively. There is also Princeton's Free Online Bitcoin course , which goes into details on some technical aspects, which might in turn help you understand the sourcecode better. Besides that, try searching Bitcoin.SE for specific questions, there are a few here that have been asked about already, if you can't find something, feel free to ask a new question here. Thank you. I am reasonably comfortable with the theoretical aspects. I am looking for pure implementation details like critical sections and libraries used and such.. user2277550 May 31 '15 at 13:25 It is probably the easiest if you then ask specific questions about any sections of the sourcecode you want to understand better. Alternatively, you might want to try asking advice in #bitcoin-dev on freenode, where a lot of Bitcoin contributors hang out regularly. Murch May 31 '15 at 16:34 My new book " A Dissection of Bitcoin " examines the original Bitcoin source code written by Satoshi. As for now, it is the first and only book available that helps you read the Bitcoin source code. I've seen the book for sale online but it appears to be only four chapters. (iTunes: "The whole book has 10 chapters. This vers Continue reading >>

Bitcoin Basics Explained: The Mnos Of Btc

Bitcoin Basics Explained: The Mnos Of Btc

Last updated on January 2nd, 2018 at 12:00 am In my earlier essays, Bitcoin Basics Explained: the ABCs of BTC , I have reviewed a number of topics from A is for Acceptability all the way to L is for Legal . Today, Id like to say M is for just one thing, but there are quite a lot of good candidates. Ive picked out three of them. One of the important discoveries in the years since David Chaum first pioneered digital cash is the need for the capability to have multiple signatures to confirm that a certain event has taken place. In developing the Bitcoin protocol , Satoshi Nakamoto was very aware of this need. Bitcoin provides for multiple signatures. Using the multisignature feature, you can have a Bitcoin address with several associated private keys, such that you need any more than one of them to spend the funds. You can specify how many keys have to sign, and have as many keys involved as you wish. Multisig escrow features are found in services provided by companies like Bitrated as well as somewhat more mainstream Bitcoin sites like Coinbase . Very detailed information about multisig and other features is found in the Bitcoin Developers Guide . Wallets featuring multisig include Greenaddress.it and BitGo. Another company with a very active interest in Bitcoin multisig is CryptoCorp. Multisignature wallets were also one of the main points of discussion in Coin Briefs interview withSam Patterson of Open Bazaar . Coin mixing is a technology used to reduce the exposure of your privacy on the public blockchain. By putting some bitcoins from other users together with the bitcoins you are spending, a mixing service deliberately confuses the trail to the users involved. A Bitcoin wiki offers 15 different sites with bitcoin mixing services . Of course, because of the nature of Continue reading >>

Still Don't Get Bitcoin? Here's An Explanation For Five-year-olds

Still Don't Get Bitcoin? Here's An Explanation For Five-year-olds

If you still cant figure out what the heck a bitcoin is, this simple explanation for a five-year-old may help you ... Were sitting on a park bench. Its a great day.I have one apple with me, I give it to you. You now have one apple and I have zero.That was simple, right? My apple was physically put into your hand.You know it happened. I was there, you were there you touched it. We didnt need athird personthere to help us make the transfer. We didnt need to pull in Uncle Tommy (whos a famous judge) to sit with us on the bench and confirm that the apple went from me to you. The apples yours! Icantgive you another apple because I dont have any left. I cant control it anymore. The apple left my possession completely. You have full control over that apple now. You can give it to your friend if you want, and then that friend can give it to his friend, and so on. So thats what an in-person exchange looks like. I guess its really the same, whether Im giving you a banana, a book, a quarter, or adollar bill Now, let's say I have onedigitalapple. Here, Ill give you mydigitalapple. Ah! Now it gets interesting. How do you knowthatdigital apple which used to be mine, is now yours, and only yours? Think about it for a second.Its more complicated, right? How do you know that I didnt send that apple to Uncle Tommy as an email attachment first? Or your friend Joe? Or my friend Lisa too? Maybe I made a couple of copies of that digital apple on my computer. Maybe I put it up on the internet and one million people downloaded it. As you see, this digital exchange is a bit of a problem.Sendingdigitalapples doesnt look like sendingphysicalapples. Some brainy computer scientists actually have a name for this problem: its called the double-spending problem . But dont worry about it. All you need Continue reading >>

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