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Create A To-do List App Using Blockchain - Ibm Code

Create A To-do List App Using Blockchain - Ibm Code

Create a to-do list app using blockchain Create a web-based to-do list application using Hyperledger Fabric V1.0 Last updated | By Ishan Gulhane , Kevin Hoyt Hyperledger Fabric is a shared, immutable ledger for recording the history of transactions; its fostering a new generation of transactional applications. This developer journey shows you how to perform traditional data store transactions with blockchain and migrate from Hyperledger Fabric v0.6 to v1.0. Youll implement a web-based to-do list application that enables you to browse, read, edit, add, and delete list items. This developer journey helps you understand how developers perform common transactions of creating, reading, updating and deleting against a Hyperledger Fabric blockchain. It also helps you migrate from Hyperledger Fabric V0.6 to Hyperledger Fabric V1. This web-based client is designed around Polymer 2 Release Candidate, which acts as a polyfill for assorted web components specifications. These specifications include Custom Elements, Shadow DOM, HTML Imports, and HTML Templates. As Hyperledger Fabric supports cross-origin resource sharing (CORS) out of the box, the web client communicates directly via HTTP/JSON. As requests arrive on Hyperledger Fabric, they are mapped to a specific smart contract written in Go. There are two types of requests that can be made. The first is an invoke request, which will take place asynchronously on Hyperledger Fabric, returning only a transaction identifier. The second is a query request which will return some value. This project uses invoke requests for create, update, and delete operations, and query requests for read operations. The to-do list application that you will create is designed to help you understand how common transactions needed by business processes Continue reading >>

How To Develop A Blockchain Application

How To Develop A Blockchain Application

Mobile Expert and Co-founder of octodev.net Bitcoin is the first decentralized currency in the world and it attracts more and more attention over the last couple of years. Bitcoin functions with the help of blockchain technology, which itself bases on the chain of transactions blocks. The information about those transactions updates at all devices in the world simultaneously. The experts predict blockchain big and bright future the technology that ensures that the authenticity of transactions can only be confirmed by the parties involved, without any middlemen or regulating parties, can confirm land and diamonds property rights and organize the communication of smart electronic devices. Despite the fact that not long time ago Bitcoin was beating all anti-records and the wide use of it in the worldwide trading is still in the distant future, blockchain is gaining more and more attention from biggest banks, techno-corporations, governments and venture investors. It was in November 2015 that the combined investments in blockchain projects and Bitcoin have passed the 1$ billion mark. Although in its early days blockchain was only attractive as a base for stable functioning of every cryptocurrency, todays researches and new technologies tell us a completely different story: this database can be used almost everywhere, there are social networks, helpful projects of all sorts and even bank services functioning with help of block data keeping system. It surely isnt the limit, blockchains future looks bright and huge. And that future is something that a lot of people could be afraid of: blockchain can easily replace a lot of bureaucracy system workers, who are only needed to work with databases. At current rate soon comes the day when we wont even need the people for maintainin Continue reading >>

What Are The Applications And Use Cases Of Blockchains?

What Are The Applications And Use Cases Of Blockchains?

What Are the Applications and Use Cases of Blockchains? Blockchain technology is a revolution in systems of record. Bitcoin is historys first permanent, decentralized, global, trustless ledger of records. Since its invention, entrepreneurs in industries around the world have come to understand the implications of this development. The nature of blockchain technology has got imaginations running wild, because the idea can now be applied to any need for a trustworthy record. It is also putting the full power of cryptography in the hands of individuals, stoppingdigital relationships from requiring a transaction authority for what are considered pull transactions. For sure, there is also a lot of hype. This hype is perhaps the result of how easy it is to dream up a high-level use case for the application of blockchain technology. It has been described as magic beans by several of the industrys brightest minds. There is more on how to test whether blockchain technology is appropriate for a use case or not in ourguide "Why Use a Blockchain?" . For now, we turn to a discussion of the development of blockchain technology for how it could be useful. Cryptographic keys in the hands of individuals allow for new ownership rights and a basis to form interesting digital relationships. As weve discussed in our guides "What is Blockchain Technology?" , "How Does Blockchain Technology Work?" and "What Can a Blockchain Do?" , blockchains provide an opportunity to establish a strong system for digital identity. Because it is not based on accounts and permissions associated with accounts, because it is a push transaction, and because ownership of private keys is ownership of the digital asset, this places a new and secure way to manage identity in the digital world that avoids exposing us Continue reading >>

17 Blockchain Applications That Are Transforming Society

17 Blockchain Applications That Are Transforming Society

17 Blockchain Applications That Are Transforming Society Angel Investors, Startups & Blockchain developers... The early internet dealt with intangibles. You sent or received emails, corresponded on forums, read and distributed articles. This modern internet deals with assets, your most valuable immediate items that you can touch and want to protect. These assets are stored in encoded form on a network-to-network chain called the blockchain or ledger, where each participant sees who you do business with. This not only protects your business dealings and prevents theft, but, also, simplifies your affairs, quickens the process, reduces errors, and saves you from hiring a third party. This decentralized blockchain system is going to change your life from the way you transact business or manage assets, to the way you use your machines, vote, rent a car, and even prove who you are. Along the way, it will transform banks and other financial institutions, hospitals, companies, and governments among others. Heres what the blockchain does and what it means to you. At its simplest, cryptocurrencies, or digital coins, are coins that are passed through an electronic network. You can make transactions by check, wiring, or cash. You can also use a type of virtual currency, most famously Bitcoin (BTC) but also Litecoin, Peercoin, or Dogecoin, among others, where you use an electronic coded address to make the transaction. The more valuable the transaction, the more you want to protect it. Traditional systems hire a mediator, such as a banker or a remittance company to ensure trust. Islanders of Yap had a different solution. They kept a mental record of who owned what and referred to this distributed community record when disputes arose. The blockchain is this community record on a wid Continue reading >>

How To Get Paid Just For Using Blockchain Apps

How To Get Paid Just For Using Blockchain Apps

Ever heard of SMSChain , the newest and hottest addition to the family of decentralized sharing economy apps? In this article, we have taken a closer look at both SMSChain and similar apps that enable you to earn money, basically for free. We hope youll enjoy our in-depth guide and profit! How to start earning tokens with Blockchain apps A number of new apps are currently pioneers in what is known as the crypto economy an economy based on Blockchain tokens. These tokens come in all shapes and sizes, but the most popular kinds of tokens are the so-called ERC-20 compatible tokens. These tokens can be stored in any ordinary Ether wallet, and can be traded on multiple exchanges. Thus, token owners can sell them for other cryptocurrencies for example the highly popular Ether and Bitcoin and they can even convert them to fiat currency if they want to. So why is this interesting? Many startup founders currently want to leverage the opportunities that a native token offers in particular, gain traction for the respective startup and app. Using a native token inside an app can serve many purposes: Users can pay or reward each other, token ownership can be attached to voting rights, or token owners can receive a share of the startups profits. All of this contributes to the establishment of a loyal and lively community inside the app ecosystem. A lot of startup teams have recognized the value of native tokens for their system. However, a critical mass of token owners and participants need to be reached in order for the community effects to come into play. Startups have quickly noticed that there are certain measures that can speed up the path to a functional community. In the early days of their businesses, they would award their tokens to early adopters in exchange for a little p Continue reading >>

Council Post: Blockchain As An Application Platform

Council Post: Blockchain As An Application Platform

Seasoned technologist and recognized expert in the field of IDM, Security and Access Management, and the use of PKI technology. Many business use cases can be improved and/or solved by using distributed ledger technology. It can be used in many cases where trust services are needed by business applications. This can be utilized by using blockchain technology as an application platform to build the underlying trust infrastructure of the system. Although Bitcoin, the first real implementation of blockchain, is a decentralized currency and payment system, the underlying constructs that form the basis of the system do not have to be limited to payment transactions, accounts, balances or users. Instead, blockchain technology in Bitcoin is nothing more than transactions secured and executed by a scripting language using cryptographic methods. This means that blockchain is a platform with a scripting language that can solve many use cases other than just cryptocurrencies. This property of blockchain led to smart contracts, an innovation presented by the cryptocurrency known as Ethereum. In the case of Ethereum, developers can create private cryptocurrencies and contract-based applications using a Turing-complete language, which allows businesses to use this language to set their own rules and policies in such applications. The distributed ledger technology used in blockchain offers multiple benefits to businesses that make a difference when implementing a solution that requires a high degree of trust for business transactions. Using the technology offers the possibility to reducecostsand offers the opportunity for businesses to build and maintain an infrastructure that delivers capabilities at lower expenses than traditional centralized models. Blockchain can process transact Continue reading >>

Blockchain Wallet: Bitcoin 4+

Blockchain Wallet: Bitcoin 4+

There were a few times i had some login issues from using this application. First time, It said login fail and then it keeping spinning for a long time, then I finally got in and my balance was 0, i was totally freaked out, then i try to click on dashboard back and forth, and finally my account balance was back to normal. And today, it just happened again. I tried to login and it failed, i kept trying for 10 minutes and it said the said thing. So I decided to login thru the website and I finally got in and my account balance was 0 but the icon is showing that it trying to download the information, but it was keeping doing that for long times so i decided to click on the menu i found a refresh button, so click it, and finally my actual account balance appeared as normal. When this happened to me twice now i consider to get a hardware wallet instead so I wont get a heart attack next time. I wish this app work flawlessly but it is not. There were a few times i had some login issues from using this application. First time, It said login fail and then it keeping spinning for a long time, then I finally got in and my balance was 0, i was totally freaked out, then i try to click on dashboard back and forth, and finally my account balance was back to normal. And today, it just happened again. I tried to login and it failed, i kept trying for 10 minutes and it said the said thing. So I decided to login thru the website and I finally got in and my account balance was 0 but the icon is showing that it trying to download the information, but it was keeping doing that for long times so i decided to click on the menu i found a refresh button, so click it, and finally my actual account balance appeared as normal. When this happened to me twice now i consider to get a hardware wallet Continue reading >>

Build Your First Blockchain Application In 5 Quicksteps

Build Your First Blockchain Application In 5 Quicksteps

Build Your First Blockchain Application in 5 QuickSteps Click here to share this article on LinkedIn To say there is hype around blockchain is an understatement. But in order for this revolution to keep advancing, we need more engineers! Recently, it was announced that there are 14 job openings for every one blockchain engineer. Its clear that theres a talent scarcity and the goal of this tutorial is to provide a blockchain foundation where you can quickly build your first full-stack decentralized application (DApp). We will be building a DApp that works as a voting system and the code can be found here . This tutorial will go over creating, compiling, and deploying the contract on a local blockchain network. You will then have the ability to interact with the contract via a nodejs cosole or a webpage GUI. Keep in mind that this can be completed with limited technical knowledge but it was designed for those that have a little coding experience. As we go through the steps, there will be a brief background on the process meant to serve as a high level overview. If any particular areas catch your interest, dont hesitate to Google around for more information. This is a lightweight approach that allows you to hit the ground running with a full stack project. This tutorial features no frameworks, limited dependencies, and no BS. Step 1: Clone repository and install dependencies # The tutorial was created with the below versions Ganache is a blockchain simulator that runs in memory locally. We will be using this as the test Ethereum blockchain for our app: Solidity code must be compiled. We will use solc to compile our solidity code: We will compile the contract from within the nodejs console: > web3 = new Web3(new Web3.providers.HttpProvider("We can ensure that the web3 obje Continue reading >>

How To Build An Application Using Blockchain Technology - Quora

How To Build An Application Using Blockchain Technology - Quora

How do you build an application using blockchain technology? Answered Feb 1, 2018 Author has 102 answers and 65.2k answer views Today, many believe that blockchain technology is a breakthrough with very serious consequences that will affect not only the sphere of finance but also many other industries. Technology is already used in the banking sector, energy, medicine, public sector, in platforms for multimedia content, and aviation. Define how you want to handle the blockchain database Test your idea with a Proof-of-Concept approach Start the Blockchain software development lifecycle A blockchain application, I think, is a good choice in the development today, because blockchain-based tools will become a core and foundational in the period ahead. Detailed information about the building of application using blockchain technology you can find here . Answered Jul 28, 2016 Author has 925 answers and 753.7k answer views As this is to much information to answer in a single post, I will try sharing a link. Hopefully QUORA will support you by allowing you to see this link below. Answered Nov 16, 2016 Author has 78 answers and 51.2k answer views First you need to ask yourself what do you need a blockchain for? Then map out the desired technical functionality, and finally scope out and find an open source blockchain that closest matches your needs and fork it, then edit and extend it to whatever you require. Exactly as you said. You could start with Bitcoin, Ethereum, Hyperledger, there are a lot! If you want to build your own blockchain from scratch for whatever reason, you need engineers who understand how to create network protocols and code cryptographic algorithm. Then you need to build it out in much the same way as you would build out any technology from the ground up. Continue reading >>

Blockchain - Using Your Blockchain Wallet

Blockchain - Using Your Blockchain Wallet

What you need to know to start using your Blockchain wallet To log into your wallet you need your Wallet ID, your password, and any two-step verification that you have enabled. Your Wallet ID is a string of random letters and numbers that acts as a username. You can find it by navigating to the Wallet Information section of your Settings menu. Although it looks similar to an address, your Wallet ID cannot be used to send or request bitcoin or ether. You will always be able to see your bitcoin & ether balances at the top of your wallet and on your dashboard. Want to see your balance in your chosen currency instead? Click on your bitcoin or ether value and it will display the fiat currency equivalent. To send bitcoin or ether from your wallet, you need the recipient's receive address or QR code. To request, you can share your address or QR code with the sender. Note: your bitcoin address will change each time you request but your ether address will stay the same. Your home screen will display your most recent transactions, and you can find your full transaction feed by clicking on the corresponding asset in your wallets menu. What do I need to create a Blockchain Wallet? + Creating a free Blockchain Wallet is quick and easy. All you need is a valid email address and a secure password. What is an address? + Addresses are strings of letters and numbers, that are used to send you bitcoin or ether. For increased privacy, a new bitcoin address is generated for every transaction. Find the address for your next transaction by clicking receive in your wallet. Are there fees? + Yes. Transaction fees cover the mining network fees and the Blockchain infrastructure necessary to ensure fast and reliable transaction confirmation times. Miners prioritize transactions based on fees, so Continue reading >>

How To Tell If You Should Use Blockchain In Your Application

How To Tell If You Should Use Blockchain In Your Application

How to Tell if You Should Use Blockchain in Your Application How to Tell if You Should Use Blockchain in Your Application By David Cardinal on March 15, 2018 at 7:30 am This site may earn affiliate commissions from the links on this page. Terms of use . Behind only AI, blockchain is the second-most-hyped developer technology. There are a few good reasons to use it in a project, but plenty of bad ones too. Whether blockchain technology is right for your application is ultimately up to you, but well take you through some of the basics on whether it is worth serious consideration. It is far too easy to confuse blockchain technology with cryptocurrency and especially Bitcoin. Blockchains are actually much more general, with many other applications. In particular, blockchains do not need to involve currency. They also dont have to involve mining, or trusting countless anonymous individuals to secure the system. In fact, the bulk of enterprise-grade blockchain projects involve entirely different models of trust, and many dont require any notion of a currency. So that begs the question: What does blockchain itself really get you? If youre happy with your database solution now, there probably isnt any reason to throw it out and move to blockchain. The switch involves rethinking everything, recoding most things, and betting on a new technology that will need many years of work to become as mature as whatever database youre currently using. However, if you are constrained by your database architecture, then moving to the distributed database (ledger) you get by using blockchain can have some major advantages. Everyone sees the same thing from everywhere, for starters. And anyone can add to the ledger in a verifiable way. So if you have lots of business partners who need to be ab Continue reading >>

Why Use The Blockchain Instead Of A Database? What Gives Tokensvalue?

Why Use The Blockchain Instead Of A Database? What Gives Tokensvalue?

Why use the blockchain instead of a database? What gives tokensvalue? A primer on blockchain and token concepts for beginners. I see these questions asked all the time by novice investors entering the space, either for specific projects, or as a general question. So I thought Id attempt to write a detailed yet basic explanation on the utility of tokens, and what justifies the use of a blockchain. Basically, blockchain embodies a lot of game theory and incentive models. In order for a blockchain network to be valuable or useful, it has to have participants in a network, it would be worthless if Bitcoin only had me and you using it, theres not much value there in a barren network with not much utility. In order to secure participants, there needs to be some sort of incentive to attract them, the most common method is via issuance or reward of the token used in the network, the more participants, the more decentralized it is. So why not just a database, why do these projects need a blockchain? There are a few key benefits to decentralizing things instead of keeping it in a centralized server/database: Having records and data decentralized, and deployed on a blockchain makes it virtually impossible for any one party to tamper with data or records. Versus how it is now, if you host your data on lets say, your computer, you can easily edit that file, before you send it to someone else, how can I ensure I can trust you? Traditional servers or data are generally centralized, making it a likely target for malicious attacks. Just look at the Equifaxs security breaches and other cybersecurity concerns arising in recent times. Instead of having a single or limited # of servers hackers can attack, decentralization via the blockchain greatly increases the difficulty. The more partic Continue reading >>

Why You Should Learn To Build Blockchain Apps

Why You Should Learn To Build Blockchain Apps

ECE Major. Blockchain, infosec, IoT, autonomous vehicles. ex{@Honda}, Research/Writing {@LoomNetwork} Why you should learn to build Blockchain Apps Last week we released CryptoZombies Lesson 4, where we continue our journey to build an army of zombies with Solidity, Ethereums programming language. As of this lesson, over 90,000 people have used CryptoZombies and are getting more familiar with developing Decentralized Applications (DApps) on Ethereum. What we have not discussed so far is why should you get involved in this space? What is there to gain? Does it really matter? The one sure thing is that demand for Blockchain Developers (often called Blockchain Engineers) exceeds the supply by far , and this demand is increasing over time: Blockchain and Bitcoin were 2 of the top 3 fastest-growing skills on Upworks Quarterly Skills Index in2017. In this article, were going to look at similar historical growth of innovative platforms, and some ways you can start making money as a blockchain developer as you develop your skillset. Lessons from the past: Google Play and Apples AppStore Lets take some data from the two biggest app stores of today, Googles Google Play and Apples App Store. In March 2009 the Google Play store (called Android Market at the time) had 2,300 apps available. By the end of October 2010 that number had increased to 100,000[ 1 ]. In February 2017 the amount of apps on Google Play store was around in the range of 2.7 million. App Store growth 20082017 | source: If blockchain really is analogous to the internet in the early 90s, then DApps are in an analogous stage to the early-days of the app stores. We are going to see massive growth in DApp software developers over the coming years. I will take a phrase from Wikipedias App Store (iOS) page, The term ap Continue reading >>

How To Create An Application On Blockchain Using Hyperledger

How To Create An Application On Blockchain Using Hyperledger

How to create an application on blockchain using Hyperledger We are going to build a digital bank using Hyperledger Composer. It will have customers and accounts. At the end of it, youll be able to transfer funds and record all transactions on blockchain. Well expose a RESTful API for the same, so that even a person who has no clue what blockchain is can make a beautiful user interface (UI) around it. Well also create this applications UI in Angular. Im super excited to share this step-by-step guide with you. So lets get started right away! Source: When I was first coding this out, I ran into errors. Lots and lots of them. But I think thats good, because it made me learn a lot of things. Errors are essential. I got to a point where I felt switching it on and off would make things better. It almost made me lose my mind, but its an integral part in every hackers life. Before getting started, you need to ensure that the machine youre using is equipped with the required configurations. You may need to download certain prerequisites and set up a basic dev environment. Below are the links to do that. Follow those steps before starting to develop an application, otherwise youll definitely run into stupid errors. First install the Hyperledger composer . Then install the development environment . Theres no need to start Playground while youre installing the environment. Make sure docker is running, and when you run./startFabric.sh its going to take a couple of minutes. So be patient. Now that your machine is all set, we can start coding! Source: Our Business Network Definition (BND) consists of the data model, transaction logic, and access control rules. The data model and access control rules are coded in domain specific language (which is very simple to catch up with). The tr Continue reading >>

What Is Blockchain Technology? A Step-by-step Guide For Beginners

What Is Blockchain Technology? A Step-by-step Guide For Beginners

What is Blockchain Technology? A Step-by-Step Guide For Beginners Angel Investors, Startups & Blockchain developers... Is blockchain technology the new internet? The blockchain is an undeniably ingenious invention the brainchild of a person or group of people known by the pseudonym, Satoshi Nakamoto . But since then, it has evolved into something greater, and themain question every single person is asking is: What is Blockchain? By allowing digital information to be distributed but not copied, blockchain technology created the backbone of a new type of internet. Originally devised for the digital currency , Bitcoin , the tech community is now finding other potential uses for the technology. Bitcoin has been called digital gold, and for a good reason. To date, the total value of the currency is close to $9 billion US. And blockchains can make other types of digital value. Like the internet (or your car), you dont need to know how the blockchain works to use it. However, having a basic knowledge of this new technology shows why its considered revolutionary. So, we hope you enjoy this, what is Blockchain guide. The blockchain is an incorruptible digital ledger of economic transactions that can be programmed to record not just financial transactions but virtually everything of value. Picture a spreadsheet that is duplicated thousands of times across a network of computers. Then imagine that this network is designed to regularly update this spreadsheet and you have a basic understanding of the blockchain. Information held on a blockchain exists as a shared and continually reconciled database. This is a way of using the network that has obvious benefits. The blockchain database isnt stored in any single location, meaning the records it keeps are truly public and easily verif Continue reading >>

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