Blockchain

Most of us have heard the name DNS(Domain Name System) which is responsible for domains to every website available on internet but ethereum websites doesn't have domain to work on internet. The domain available within the ethereum network is .eth but not for DNS. So a system ENS (Ethereum Network System) making the domain .luxe for ethereum websites to work on DNS system. Basically it is the first step in making the connection to operate eth websites with just using . luxe domain.

Technology has a great impact on human life and is meant to make life easier and better, with this notion Web 2.0 made it easy to get the things or products easily either it's within the nation or across the boundaries. But it is failing sometimes to get the assured and authentic ordered item. Many a times the product sold is fake and doesn't show the basic details from using raw material to fine product to shipping to an address. But with using blockchain the problem can be removed as- 1- For people using product They can get to know each detail about the item and can be assured of quality used, process, manufacturing and it is because of using the concept of hashing and securing each step in making the product. It also reduces the cost price of product. 2- For people employed in industry It is seen that the person responsible for your product can be a child doing child labour which is against law. So a child can be saved from it. This is helping the people in becom...

In today's world the traditional methods of journalism like newspapers, magazines etc. are loosing their way out and the digital means are becoming a part of lives. People are using their mobile phones, laptops etc. to get to know the news which can be manipulated in someway. This has also created an atmosphere of not trusting the media agencies or news channels even the most respectable or trusting sources and this is happening all around the world. Whether it's a developed nation or a third world country, somehow every country is facing the problem of fake news and this is happening because everyone is given a digital freedom to tamper the news the way they want. So how blockchain can solve this problem. This gives an authority to people to vote to select an author or a media agency which can be trusted to publish the news like we elect our President/Prime Minister(depends on country) and can get to know about world in a clean and better way and save our future generation...

Distributed P2P network is a network in which different computers are connected to each other having same blockchain on each system.So if someone tries to attack or hack the blockchain it has to change the block and the block coming after it. Let's say you hacked a system/pc and changed the entire blockchain after a block but the connected computers having same blockchain communicate with this attacked system and the majority of right chain stops the blockchain to get hacked. In simple words to hack a blockchain a person needs to hack at least 50% of the computers/laptops to change the entire blockchain which is practically impossible because of the computational time taken for hacking and in this period the other systems corrected the chain (or the new validated blocks get added).

Ledger is a collection of entries of debits and credits and in general it is kept in a form of book or some excel sheet etc. which can be destroyed easily. For example:- The owner of a house has property documents in a file and someone changed it physically and make himself/herself the owner of same house. But when it comes to blockchain that mischievous person has to change that block of ledger as well as the block comes after it because the hash of each block is linked to the next block come after it. Since present hash is calculated using the previous hash,so if you are changing the present hash you need to change the next hashes otherwise the chain will not approve your calculated hash.In this way the blockchain has a property of Immutable ledger.

Hash cryptography is based on algorithm called SHA(Secure Hash Algorithm) which can be SHA-3,SHA-1,SHA-256 and many more. Here I am briefing SHA-256 where the data is represented in hexadecimal form which is 64 characters long made up of numbers (0 to 9) and and alphabets (a to f) each 4 bits long. Basically hash is like a fingerprint means unique. For example:- a document with hash     📄--> 0023a76bef63c568                  67dc128a3fe60a7e                d47b95a532b60a74                a62e73f026d957a3 Some properties of hash are- 1- Avalanche effect:- the hash will change with even a single change in document. 2- Deterministic:- the document will always give the same hash. 3:- One way:- one can calculate hash of a document but document ...

When you search about blockchain the most repited definition can be seen is " A  blockchain , originally  block chain ,  is a growing list of  records , called  blocks , which are linked using  cryptography ."- by Wikipedia. But what actually these blocks contain and how it is linked and other technical stuffs are not shown in simple way. These blocks contain data which includes some parameters like the number of block, previous hash etc. which are needed to calculate the hash of present block. There are mainly five things to understand what actually the tech is. 1- Hash cryptography 2- Distributed P2P network 3- Immutable ledger 4- Consensus Protocol 5- Mining Each of these points are explained in next blogs but in simple way.