Bellaj Badr [Bellaj Badr] - Blockchain By Example
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- Book:Blockchain By Example
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Dive into working mechanics of the decentralized blockchain applications to build your own scalable dapps
About This Book- Guide to help you learn Blockchain ecosystem and their terminologies
- Implement smart contracts, wallet, consensus protocols, and other principles
- Design and develop decentralized applications using Bitcoin, Ethereum, and Hyperledger
If you are keen on learning how to build your own blockchain decentralized applications from scratch, then this book is what you need. Implement key building blocks of a blockchain ecosystem with this handy guide. It explains all the basic concepts required to develop intermediate projects
What You Will Learn- Grasp the decentralized technology fundamentals to master blockchain principles.
- Build blockchain projects on Bitcoin, Ethereum, and Hyperledger.
- Create your own currency and a payment application using Bitcoin
- Implement Web3.js apps and supply chain system using Hyperledger.
- Write smart contracts, run your ICO and build tontine decentralized app using Ethereum
- Explore Blockchain to learn how to implement distributed file management.
- Integrate blockchain into your existing systems in your organization
The blockchain is a revolution promising a new world without middlemen. Technically, it is an immutable and tamper-proof distributed ledger of all transactions across a peer-to-peer network. With this book, you will set a foundation to get into the grips of blockchain ecosystem to build real-world projects.
Throughout the book, we will walk you through a detailed step-by-step process using solidity to build three blockchain projects with different complexity levels and hurdles. This book will provide you with all the relevant concepts related to cryptocurrencies, smart contracts, and blockchain in order to build your own decentralized applications. Each project will teach you just enough about blockchain to be productive right away. We will cover the different set of projects such as Bitcoin Payment System, Supply Chain on Hyperledger, and Tontine Bank Dapp using Ethereum. We will cover major challenges that are associated with Blockchain ecosystems such as scalability, integration, distributed file management and more.
By the end of this book, you will not only be able to tackle the common issues in the blockchain ecosystem but also design and build reliable, scalable distributed systems.
Downloading the example code for this book. You can download the example code files for all Packt books you have purchased from your account at http://www.PacktPub.com. If you purchased this book elsewhere, you can visit http://www.PacktPub.com/support and register to have the code file.
Bellaj Badr [Bellaj Badr]: author's other books
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At first sight the previous resultant hexadecimal string seems ambiguous and meaningless. T he following table breaks down and examines in depth our transaction byte per byte:
As you can see, our transaction has one input (the only unspent transaction received from the faucet), with transaction id "0791...252", and two outputs:
- OP_RETURN output with an OP_RETURN script.
- An output sending 1 BTC to the specified address.
The transaction structure can be visualized by decoding back the raw transaction using the deserialize command. If you run electrum --testnet deserialize , it will output a meaningful JSON representation of our constructed transaction :
For the same result, you can decode the raw transaction using bitcoin-cli decoderawtransaction or by using an online decoder such https://live.blockcypher.com/btc-testnet/decodetx/
After you have downloaded and installed Electrum, open Electrum's testnet mode by running : electrum --testnet . When you run Electrum the first time it will display the new wallet creation wizard follow then these steps:
- Select in the first dialogue box Auto Connect and click Next.
- Select Standard wallet and click Next.
- Keep pressing "Next" for the rest of the dialog boxes that appear until you are requested to save the seed words. Copy them somewhere, then in the next Dialogue Box write them correctly in the given order .
- In the last step it will ask you for a password, which you can leave empty this time.
Once finished, Electrum will generate for you a new wallet with plenty of new addresses. Quit the Electrum GUI and let's continue in CLI mode. We run Electrum as a daemon process whereby we execute the JSON/RPC commands as following :
electrum --testnet daemonelectrum --testnet daemon load_wallet
In a new terminal window run electrum --testnet listaddresses:
At this level we have the necessary playground to start transacting with Bitcoin network.
We have to locate the following line in chainparams.cpp in the three classes CMainParams, CTestNetParams and CRegTestParams
genesis = CreateGenesisBlock(time, nonce, bits, 1, 10 * COIN);In the order change the arguments of the CreateGenesisBlock function using the values computed previously by GenesisH0 script as following:
genesis = CreateGenesisBlock(1529321830, 490987, 0x1e0ffff0, 1, 10 * COIN);The last argument in the function is the initial reward (10 ReaderCoins) for generating the genesis block.
As most of the work is done, let's put the results into practice.
At this level everything is ready to launch our ReaderCoin network. We'll need to build a network of two connected machines, called node A and node B . Before advancing further check that both machines can ping each other. Let's say nodeA has the IP address 192.168.1.3 and node B 192.168.1.8.
At this point, we have built ReaderCoin on a single machine (node A), so we will need to build it on node B in the same manner we did in node A. For that you can clone the code source from our remote repository or just transfer the ReaderCoin folder using a USB memory stick. If successfully built, you will be ready to connect the P2P ReaderCoin nodes.
Once ReaderCoin is built successfully on both nodes, run the Qt client or readercoin-qt -printtoconsole.
The option -printtoconsole prints out the client log:
Running the ReaderCoin client for the first time will create a .readercoin directory in your home directory, along with some other necessary files. Stop the client to create a configuration file named readercoin.conf in ~/.readercoin and insert the following lines:
server=1rpcuser=set a username
rpcpassword=set a password
addnode=the other node's IP
rpcallowip=192.168.0.0/16
Instead of using the addnode option in the configuration file you can run the clients on both nodes and execut the addnode RPC call:
readercoin-cli addnode 192.168.1.3:9333 onetry (in nodeA)
readercoin-cli addnode 192.168.1.8:9333 onetry (in nodeB)
A log entry in both peers should appear confirming the pairing similar to the following. If not, try it again or wait a bit.
You can check if both nodes are connected using : readercoin-cli getpeerinfo
You'll need to see all the connected peer information as shown in figure below:
It's worth noting that you can run RPC commands from the GUI without using a terminal as follow:
- Open the ReaderCoin Wallet
- Choose "Help"
- Select "Debug window"
- Select "Console"
- Execute your command line without using readercoin-cli
Our nodes are ready to start sending and receiving ReaderCoins but as you notice we don't have any yet. Therefore, we need to start mining, either on one of the nodes or both of them.
The previous chapter was an excellent starting point for understanding the blockchain and learning about Bitcoin. In fact, we covered many basic concepts and elementary operations such as signing, sending raw transactions and storing data into the blockchain. We'll herein, continue practically exploring the blockchain, by first building a customer-friendly payment system based on the Bitcoin payment protocol and secondly build our first smart contract in the Bitcoin system.
The end goal of this chapter is to help you acquire the necessary technical background for understanding Bitcoin's mechanics, and build your first B itcoin applications using very common languages such as JavaScript and Java. If you're an experienced programmer, most likely you are familiar with one of these technologies, otherwise I would recommend you spending time reading their official getting started documentation.
Throughout this chapter we will cover the following key points:
- Introducing bitcoin.
- Building BIP 70 payment system using Nodejs and bitcore-lib.
- Building bitcoin client using BitcoinJ.
- Writing and deploying Smart contract in bitcoin using Rootstock.
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