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Showing posts with the label Crypto Currency

What is Blockchain Technology?

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"The practical consequence [...is...] for the first time, a way for one Internet user to transfer a unique piece of digital property to another Internet user, such that the transfer is guaranteed to be safe and secure, everyone knows that the transfer has taken place, and nobody can challenge the legitimacy of the transfer. The consequences of this breakthrough are hard to overstate." - Marc Andreessen From a cruising altitude, a blockchain might not look that different from things you're familiar with, says Wikipedia. With a blockchain, many people can write entries into a record of information, and a community of users can control how the record of information is amended and updated. Likewise, Wikipedia entries are not the product of a single publisher. No one person controls the information. Descending to ground level, however, the differences that make blockchain technology unique become more clear. While both run on distributed networks (the internet), ...
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What is Bitcoin? How does it work?

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What is Bitcoin? Bitcoin is a cryptocurrency and a digital payment system created by an unknown programmer, or a group of programmers, under the name Satoshi Nakamoto. It is the first decentralized digital currency. Bitcoins are digital coins, you can send over the internet. Compared to other choices, bitcoin have many advantages. They are transferred straight from person to another via Internet without going to the bank. It means that the transactions fees are extremely lower, anyone can use them in every country, the account cannot be frozen and there are no limits. How does it work? Many currency exchanges exist on the Internet where you can buy and sell bitcoins. Your coins are saved in your digital wallet on your computer or mobile device or any online wallet. Sending and receiving Bitcoins is as easy as sending and receiving email, you can buy anything with Bitcoin. When it comes to the transaction it generates a first Bitcoin address, something like an email, which acts in ...
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How to Secure Session Management in Node

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In a web application, data is transferred from a browser to a server over HTTP. In modern applications, we use the HTTPS protocol, which is HTTP over TLS/SSL (secure connection), to transfer data securely. Looking at common use cases, we often encounter situations where we need to retain user state and information. However, HTTP is a stateless protocol. Sessions are used to store user information between HTTP requests. We can use sessions to store users' settings like when not authenticated. Post authentication sessions are used to identify authenticated users. Sessions fulfill an important role between user authentication and authorization. Exploring Sessions Traditionally, sessions are identifiers sent from the server and stored on the client-side. On the next request, the client sends the session token to the server. Using the identifier, the server can associate a request with a user. Session identifiers can be stored in cookies, localStorage, and sessionStorage. Session identi...
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Angular 9 - User Registration and Login Example & Tutorial

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In this tutorial we'll go through an example of how to build a simple user registration, login and user management (CRUD) application with Angular 9. The project is available on GitHub at  https://github.com/cornflourblue/angular-9-registration-login-example . The Angular CLI was used to generate the base project structure with the  ng new <project name>  command, the CLI is also used to build and serve the application. For more info about the Angular CLI see  https://angular.io/cli . Styling of the example app is all done with Bootstrap 4.4 CSS, for more info about Bootstrap see  https://getbootstrap.com/docs/4.4/getting-started/introduction/ . Here it is in action:   (See on StackBlitz at  https://stackblitz.com/edit/angular-9-registration-login-example ) Running the Angular 9 Login Tutorial Example Locally Install NodeJS and NPM from  https://nodejs.org . Download or clone the Angular project source code from  https:...
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How to download a file using command prompt (cmd) Windows?

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If you’re like most Internet users, you download various types of files now and then. You either download these files with your web browser or some download manager software. Have you ever considered downloading files using the command prompt i.e. CMD? If not, we recommend you to try it. It’s quite interesting apart from being very useful as well. In this article, we’ll show you how to download a file using command prompt aka CMD. How to download a file using command prompt?   There are several useful commands for the Command Prompt and one of them is  bitsadmin . Though bitsadmin has several uses, here we shall limit this article to its role in downloading files only. If you want to read the details about bitsadmin syntax, continue reading this section. Otherwise, you can scroll down to the next section –  Downloading a file .   The syntax of bitsadmin is : BITSADMIN [/RAWRETURN] [/WRAP | /NOWRAP] command   As you know, the parts of the syntax inside ...
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