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Blockchain Course Online - Blockchain Certification Training - Intellipaat

Blockchain Course Online - Blockchain Certification Training - Intellipaat

The Intellipaat blockchain online instructor-led training will help you master & learn blockchain technology, the driving force behind the cryptocurrency Bitcoin. You will learn the various aspects of structure, mechanism, advantages of blockchain technology, designing of a blockchain network, deploying it for real world applications and more in this blockchain certification training. Introduction to Blockchain, the technology of Blockchain, network and mechanism, history of blockchain, the benefits of Blockchain, blocks and transactions, Peer to Peer systems, the block structure in blockchain, what is Dynamic shared ledger, digital signatures, how to build a blockchain solution, hashes as addresses, using a key as identity, ways of storing Bitcoin Keys, Trade and transact with Bitcoins, Global Blockchain Ecosystem Core, Layers Of A Blockchain, Data Layer, Network Layer, Consensus Layer. Understanding what is bitcoin, the network of bitcoins, how to mine a bitcoin, the various bitcoin wallets, what are the alternative blockchains available, what is a smart contract, what is a public network and a private consortium, Ethereum Virtual Machine, the Merkle Tree, the Ethereum environment, DApps, Decentralized Autonomous Organizations (DAO), the problem of double-spend, how blockchain impacts cryptocurrencies, Mechanics Of Bitcoin, Transcriptions, Scripts, Blocks, Peer-to-peer network, Security Measures. Identify Bitcoin and its Era Understand Where & How to Get Bitcoins Identify Bitcoin Wallets Identify Jaxx Wallet Define Selling Bitcoins Compare Bitcoin Blockchain, Transaction & Transaction Script Describe Various Transaction Forms in Bitcoin, Define Scripts in Bitcoin, List Nodes in Bitcoin Network. Understand Economics of Bitcoin Define Bitcoin Mining Describe Fabricatio Continue reading >>

Golang Bitcoin Miner

Golang Bitcoin Miner

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Go (programming Language)

Go (programming Language)

For the language released in 2003 by McCabe and Clark, see Go! (programming language) . "Google Go" redirects here. For the computer program by Google to play the board game Go, see AlphaGo . Go (often referred to as Golang) is a programming language created at Google [10] in 2009 by Robert Griesemer, Rob Pike , and Ken Thompson . [9] Go is a statically typed language in the tradition of C , with memory safety , garbage collection , structural typing , [2] and CSP -style concurrent programming features added. [12] The compiler and other tools originally developed by Google are all free and open source . [13] The language was announced in November 2009. Version 1.0 was released in March 2012. [14] [15] It is used in some of Google's production systems, as well as by many other companies and open source projects. [16] Google's Go toolchain, targeting multiple platforms including Linux , BSD , OS X , Plan 9 , Windows , and (since 2015) mobile devices. [17] The primary Go compiler has been self-hosting since version 1.5. [18] A second compiler, gccgo, is a GCC frontend. [19] [20] Go originated as an experiment by Google engineers Robert Griesemer, Rob Pike , and Ken Thompson to design a new programming language that would resolve common criticisms of other languages while maintaining their positive characteristics. The developers envisioned the new language as: [21] Statically typed and scalable to large systems (like Java or C++ ) Not requiring integrated development environments , but supporting them well Supporting networking and multiprocessing In later interviews, all three of the language designers cited their shared dislike of C++ as a primary motivation for designing a new language. [23] [24] [25] Go is recognizably in the tradition of C , but makes many changes to Continue reading >>

Building Blockchain In Go. Part 1: Basic Prototype

Building Blockchain In Go. Part 1: Basic Prototype

Building Blockchain in Go. Part 1: Basic Prototype Chinese translations: by liuchengxu , by zhangli1 . Blockchain is one of the most revolutionary technologies of the 21st century, which is still maturing and which potential is not fully realized yet. In its essence, blockchain is just a distributed database of records. But what makes it unique is that its not a private database, but a public one, i.e. everyone who uses it has a full or partial copy of it. And a new record can be added only with a consent of other keepers of the database. Also, its blockchain that made cryptocurrencies and smart contracts possible. In this series of articles well build a simplified cryptocurrency thats based on a simple blockchain implementation. Lets start with the block part of blockchain. In blockchain its blocks that store valuable information. For example, bitcoin blocks store transactions, the essence of any cryptocurrency. Besides this, a block contains some technical information, like its version, current timestamp and the hash of the previous block. In this article were not going to implement the block as its described in blockchain or Bitcoin specifications, instead well use a simplified version of it, which contains only significant information. Heres what it looks like: type Block struct { Timestamp int64 Data []byte PrevBlockHash []byte Hash []byte} Timestamp is the current timestamp (when the block is created), Data is the actual valuable information containing in the block, PrevBlockHash stores the hash of the previous block, and Hash is the hash of the block. In Bitcoint specification Timestamp, PrevBlockHash, and Hash are block headers, which form a separate data structure, and transactions (Data in our case) is a separate data structure. So were mixing them here for s Continue reading >>

Blockchain Engineer Amsterdam | Golang, Nodejs | Cryptography, Bitcoin, Cryptocurrency | Be The Person That Helped Millions Adopt Blockchain Technology | Up To 70.000

Blockchain Engineer Amsterdam | Golang, Nodejs | Cryptography, Bitcoin, Cryptocurrency | Be The Person That Helped Millions Adopt Blockchain Technology | Up To 70.000

Your new job: Blockchain engineer Amsterdam | Be the person that helped millions adopt blockchain technology! Do you want to build one of the biggest Blockchain products worldwide? Do you want your software to impact the lives of millions of daily consumer users? Would you like to work directly with a very technical development manager from Silicon Valley? And what about to top it all offwork with a world-class Blockchain engineering team with a big focus on security regarding billions of euros in transactions? Yes do you? Then read on because this is for you! Your new employer: A swiftly growing, world-class engineering team making massive impact with a disruptive blockchain product used by millions around the world. Your new employer is famous: One of the worlds biggest blockchain products is builtrighthere in the lovely city of Amsterdam! If you like to be in the frontline of this emerging technology, this is the place to be. The mother company is a top 5 blockchain company worldwide in terms of market share. Therefore your new employer has all the benefits of extensive resources, knowledge and exposure. But at the same time enjoys full autonomy and freedom to build this product as they see fit. And all this in one of the most beautiful parts of Amsterdam. Help change the world AND feel great while youre doing it! The product is already being used by millions of daily users and has a serious impact on the lives of people around the world. This also translates in very direct feedback from your users. The quality of the product is high, due to the fact the people making it are true engineers who are all leaders in their fields (with papers and experience to prove it). These guys have contributed to famous open source projects. Built and sold successful companies and h Continue reading >>

Code Your Own Blockchain Mining Algorithm Ingo!

Code Your Own Blockchain Mining Algorithm Ingo!

Precision medicine. Powered by the Blockchain. Code your own blockchain mining algorithm inGo! If you have any questions or comments about the following tutorial, make sure to join our Telegram chat. Ask us anything! With all the recent craze in Bitcoin and Ethereum mining its easy to wonder what the fuss is all about. For newcomers to this space, they hear wild stories of people filling up warehouses with GPUs making millions of dollars worth of cryptocurrencies a month. What exactly is cryptocurrency mining? How does it work? How can I try coding my own mining algorithm? Well walk you through each of these questions in this post, culminating in a tutorial on how to code your own mining algorithm. The algorithm well be showing you is called Proof of Work, which is the foundation to Bitcoin and Ethereum, the two most popular cryptocurrencies. Dont worry, well explain how that works shortly. Cryptocurrencies need to have scarcity in order to be valuable. If anyone could produce as many Bitcoin as they wanted at anytime, Bitcoin would be worthless as a currency (wait, doesnt the Federal Reserve do this? *facepalm*). The Bitcoin algorithm releases some Bitcoin to a winning member of its network every 10 minutes, with a maximum supply to be reached in about 122 years. This release schedule also controls inflation to a certain extent, since the entire fixed supply isnt released at the beginning. More are slowly released over time. The process by which a winner is determined and given Bitcoin requires the winner to have done some work, and competed with others who were also doing the work. This process is called mining, because its analogous to a gold miner spending some time doing work and eventually (and hopefully) finding a bit of gold. The Bitcoin algorithm forces partic Continue reading >>

Show Hn: Accelerating Sha256 By 100x In Golang On Arm | Hacker News

Show Hn: Accelerating Sha256 By 100x In Golang On Arm | Hacker News

This is the sort of thing that shows why the whole "pure RISC philosophy" of implementing only the simplest instructions is ultimately a pretty dead-end in processor design. CISC-style dedicated instructions and hardware which utilises them will always be more efficient than a pure software implementation using just "simple RISC instructions", because hardware can easily express specialised computations like the extreme parallelism of algorithms such as SHA while software implementations essentially rely on the instruction-scheduling mechanisms to arrange potentially hundreds or even thousands of instructions in an optimal order. In addition, when there is dedicated hardware, it is also significantly easier to add a SHA instruction than attempt to recognise sequences of many regular instructions that could be "fused together" into a single operation using that hardware. When there isn't, adding such an instruction that gets internally expanded into multiple uops for the equivalent using the existing functional units is still beneficial, since it leaves open room for an immediate performance gain on all existing software when a future revision does add that dedicated hardware, or optimises its microarchitecture to allow those (possibly different) uops to execute faster. Despite the name, ARM is definitely not very RISC anymore, and that's what has kept it competitive. > CISC-style dedicated instructions and hardware which utilises them will always be more efficient than a pure software implementation using just "simple RISC instructions" For a counterexample, see the x86 string instructions. "Hardware" implementations like `repne scasb` are routinely outperformed by software implementations using SSE2. Another problem is that these instructions don't die. SHA will some Continue reading >>

Create And Sign Bitcoin Transactions With Golang

Create And Sign Bitcoin Transactions With Golang

Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by disabling your ad blocker. Create And Sign Bitcoin Transactions With Golang About a month ago I had written about creating and importing private keys as well as generating public addresses for Bitcoin and several other cryptocurrencies using the Go programming language. This previous tutorial had more of an emphasis on creating cryptocurrency wallets with Golang than anything. The next step in making Bitcoin and other cryptocurrencies useful is to be able to transfer or send them to other people. Sending Bitcoin is part of a process known as creating and broadcasting a transaction. While we wont be actually broadcasting a transaction in this tutorial, were going to figure out how to create an unsigned transaction, then sign it, using the Go programming language and some popular Bitcoin packages. Going forward, it must be made clear that I am not a cryptocurrency or cryptography expert. If youve found bugs in what Ive shared, please let me know in the comments. If youre just planning to copy and paste the code Ive provided, please do so understanding that it is at your own risk. Understanding the Moving Pieces of Bitcoin Transactions Before we get into the coding, we need to understand how transactions work. It is an unnecessarily difficult concept that too me quite a while to figure out using Golang. It is much easier with other technologies like Node.js because the libraries take the guess work out of it. When working towards creating a transaction, we have the following parts: Senders unspent transaction output (UTXO) Using the above, further data must be derived and be a part of the transaction, but before we get there, lets figure out what the above pa Continue reading >>

Golang | Conformal Systems, Llc.

Golang | Conformal Systems, Llc.

We are pleased to announce that btcd , our full-node bitcoind (bitcoin core) alternative written in Go, now has support for the getwork RPC which allows it to function with cgminer ! We have extensively tested the code on testnet. The following is a sampling of the latest blocks weve generated on testnet using btcd + cgminer: 226713 226830 227228 227390 227393 . If you are simply interested in learning how to configure btcd to work with cgminer , you can view the setupinstructions on the btcd wiki, however if youre interested to learn about some of the nuts and bolts that make it all work, read on. Before I dig into some of the details, I would like to touch on a topic that Im sure some astute readers will undoubtedly be asking, which is Why implement getwork when it has been deprecated in favor of getblocktemplate ( BIP0022 and BIP0023 )? There are a few reasons why we chose to implement it first: Supporting getwork was a lot less time consuming than getblocktemplate proposals and software such as cgminer still functions properly with getwork. This means we were able to release support for mining more quickly by supporting getwork first. The bulk of the work involved was the code to create and manipulate block templates which is used by both getwork and getblocktemplate. Thus it helps pave the way to supporting getblocktemplate proposals while allowing getwork to function in the mean time. The current reference implementation (bitcoin core) still supports getwork. Even though it will likely be removed in the next version, one of the goals of btcd is to be a drop-in alternative that can be used with existing infrastructures. We are pleased to announce our 2014 summer internship program at Conformal Systems. A short summary of the program is as follows: 2 full-time inte Continue reading >>

Golang Bitcoin Miner

Golang Bitcoin Miner

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Github - Btcsuite/btcd: An Alternative Full Node Bitcoin Implementation Written In Go (golang)

Github - Btcsuite/btcd: An Alternative Full Node Bitcoin Implementation Written In Go (golang)

btcd is an alternative full node bitcoin implementation written in Go (golang). This project is currently under active development and is in a Beta state. Itis extremely stable and has been in production use since October 2013. It properly downloads, validates, and serves the block chain using the exactrules (including consensus bugs) for block acceptance as Bitcoin Core. We havetaken great care to avoid btcd causing a fork to the block chain. It includes afull block validation testing framework which contains all of the 'official'block acceptance tests (and some additional ones) that is run on every pullrequest to help ensure it properly follows consensus. Also, it passes all ofthe JSON test data in the Bitcoin Core code. It also properly relays newly mined blocks, maintains a transaction pool, andrelays individual transactions that have not yet made it into a block. Itensures all individual transactions admitted to the pool follow the rulesrequired by the block chain and also includes more strict checks which filtertransactions based on miner requirements ("standard" transactions). One key difference between btcd and Bitcoin Core is that btcd does NOT includewallet functionality and this was a very intentional design decision. See theblog entry here for more details. This means you can't actually make or receive paymentsdirectly with btcd. That functionality is provided by the btcwallet and Paymetheus (Windows-only) projectswhich are both under active development. Install Go according to the installation instructions here: Ensure Go was installed properly and is a supported version: NOTE: The GOROOT and GOPATH above must not be the same path. It isrecommended that GOPATH is set to a directory in your home directory such as~/goprojects to avoid write permission issues Continue reading >>

Github - Piotrnar/gocoin: Full Bitcoin Solution Written In Go (golang)

Github - Piotrnar/gocoin: Full Bitcoin Solution Written In Go (golang)

Full bitcoin solution written in Go (golang) If nothing happens, download GitHub Desktop and try again. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Gocoin is a full Bitcoin solution written in Go language (golang). The software architecture is focused on maximum performance of the nodeand cold storage security of the wallet. The client (p2p node) is an application independent from the wallet.It keeps the entire UTXO set in RAM, providing the best block processing performance on the market.With a decent machine and a fast connection (e.g. 4 vCPUs from Google Cloud or Amazon AWS),the node should sync the entire bitcoin block chain in less than 4 hours (as of chain height ~512000). The wallet is designed to be used offline.It is deterministic and password seeded.As long as you remember the password, you do not need any backups ever. File system supporting files larger than 4GB. Any platform that you can make your Go (cross)compiler to build for (Raspberry Pi works). For security reasons make sure to use encrypted swap file (if there is a swap file). If you decide to store your password in a file, have the disk encrypted (in case it gets stolen). Having hardware requirements met, any target OS supported by your Go compiler will do.Currently that can be at least one of the following: In order to build Gocoin yourself, you will need the following tools installed in your system: Go (version 1.8 or higher) - If the tools mentioned above are all properly installed, you should be able to execute go and gitfrom your OS's command prompt without a need to specify full path to the executables. When building for Linux make sure to have gc Continue reading >>

Learn Blockchains By Buildingone

Learn Blockchains By Buildingone

The fastest way to learn how Blockchains work is to buildone Youre here because, like me, youre psyched about the rise of Cryptocurrencies. And you want to know how Blockchains workthe fundamental technology behind them. But understanding Blockchains isnt easyor at least wasnt for me. I trudged through dense videos, followed porous tutorials, and dealt with the amplified frustration of too few examples. I like learning by doing. It forces me to deal with the subject matter at a code level, which gets it sticking. If you do the same, at the end of this guide youll have a functioning Blockchain with a solid grasp of how they work. Remember that a blockchain is an immutable, sequential chain of records called Blocks. They can contain transactions, files or any data you like, really. But the important thing is that theyre chained together using hashes. If you arent sure what a hash is, heres an explanation . Who is this guide aimed at? You should be comfy reading and writing some basic Python, as well as have some understanding of how HTTP requests work, since well be talking to our Blockchain over HTTP. What do I need? Make sure that Python 3.6 + (along with pip) is installed. Youll also need to install Flask and the wonderful Requests library: pip install Flask==0.12.2 requests==2.18.4 Oh, youll also need an HTTP Client, like Postman or cURL. But anything will do. Wheres the final code? The source code is available here . Open up your favourite text editor or IDE, personally I PyCharm . Create a new file, called blockchain.py. Well only use a single file, but if you get lost, you can always refer to the source code . Well create a Blockchain class whose constructor creates an initial empty list (to store our blockchain), and another to store transactions. Heres the bluep Continue reading >>

Gocoin - Bitcoin Wiki

Gocoin - Bitcoin Wiki

An open-source Bitcoin solution written in Go language (golang).It can be built for every platform that has a working Go compiler.It uses a proprietary license, though is free to use for non-commercial purposes. Gocoin's architecture is quite different from the reference implementation (of the Satoshi client). The core of the software is a library that essentially provides the blockchain protocol parser. That includes script parsing, ECDSA signature verification, but also things like address encoding, parsing of canonical signatures or extracting hashes that need to be signed for specific inputs of a given transaction. It is a relatively big library, that contains many useful bitcoin function. Inside the package, there is also a blocks persistent storage database (blockdb.go) - it is just a simple plain storage (that can only grow), with an index. It uses snappy compression, allowing to save about 30% of the disk space. The core library interfaces directly with a UTXO database backed.For this purpose Gocoin uses its own database engine, that has been designed to deal with the specific characteristics of bitcoin's UTXO database. To speed up the Elliptic Curve operations the secp256k1 library by sipa has been ported to Go. The online client is a kind of a server software (or a peer-to-peer node) that is meant to be running all the time. It handles the network related communication, feeds the core lib with new incoming blockchain data, monitors balances on the wallets' addresses, manages transaction memory pool and the peers database. It also provides an interactive user interface. The wallet application is responsible for creating private keys (from a seed password) and for signing transactions with them.It can also sign text messages with private keys and decode raw tra Continue reading >>

Bitcoin Core - Multiple Input/output Transactions Using Golang Btcd - Bitcoin Stack Exchange

Bitcoin Core - Multiple Input/output Transactions Using Golang Btcd - Bitcoin Stack Exchange

Multiple input/output transactions using golang btcd I am using golang's btcd as a basis for creating some server-side tools for handling transactions. I found a good example for creating a basic one-input-one-output transaction to get me started on the implementation, and I have also read the documentation heavily on the technical specifics here. I have also looked at the other btcsuite libraries pretty heavily to try to gain more insight. To be clear, I am NOT expecting any of these tools to issue the transaction or anything like that; I understand that this was written out of btcd in particular for very, very good reasons. I am just trying to use these tools to create valid transactions that I can issue later. I am still incredibly confused on the particulars in implementing multiple input, multiple output transactions and the scripts that we use on them. A few topics: I'm familiar with the script tools in btcd, the link goes to the most common one used, but all of these scripts are used for one specific output. There seems to be absolutely no documentation anywhere about how to provide scripting for multiple outputs. If I'm doing a normal P2PK or P2PKH transaction, do I simply concatenate the scripts for all the various outputs, or what? In the create Transaction example in the HelloBitcoin example I've linked above, the overall magic happens near the end with: buffer.Write(version)buffer.Write(inputs)buffer.Write(inputTransactionBytesReversed)buffer.Write(outputIndexBytes)buffer.WriteByte(byte(scriptSigLength))buffer.Write(scriptSig)buffer.Write(sequence)buffer.Write(numOutputs)buffer.Write(satoshiBytes)buffer.WriteByte(byte(scriptPubKeyLength))buffer.Write(scriptPubKey)buffer.Write(lockTimeField) And I feel like there are a lot of unanswered questions on how to e Continue reading >>

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