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What is a Blockchain?

Blockchains are distributed databases shared by the nodes in the computer network. A database blockchain records information electronically in digital form. Blockchains are known best for their essential function in crypto-currency systems like Bitcoin and Bitcoin, in keeping a safe and uncentralized database of transactions. The benefit of a blockchain is that it assures the integrity and security of data, and creates trust without the requirement of an untrustworthy third party.

The main distinction between a traditional blockchain and a database is how data is organized. Blockchains store information in groups, also known by the name of blocks which are a collection of different types of data. Blocks can be stored in a variety of capacities and, when they’re filled when they are filled, they are sealed and linked to the previous block and form the chain of information known as the blockchain. Any new information added to the newly added block is assembled into a brand new block, which will add to the chain after it is completed.

A database typically organizes the data it stores into tables while a blockchain, as the name suggests, assembles it into pieces (blocks) which are connected. This structure of data creates an irreversible line of time when used in a decentralized manner. Once a block has been full, it is set in stone and is made a part of the time line. Every block will be given a specific date and time when it’s joined to the chain.


  • A blockchain is a form of shared database which differs from the typical database in the way it stores data. Blockchains contain data in blocks that are later linked via cryptography.
  • When new information is received and is entered into a new block. When the block is full of data, it’s connected to the previous block to make the data connected in chronological sequence.
  • A variety of types of data can be saved on a blockchain, however, the most popular use to date has been as a transaction ledger.
  • In the case of Bitcoin blockchain is used in a way that is decentralized, meaning that no one individual or group holds the power. Instead the entire community of users has the control.
  • Blockchains that are decentralized are immutable, which means the data that is entered is irrevocable. For Bitcoin it implies that transactions are forever documented and available to anyone.

What’s the process of a Blockchain work?

Blockchain’s goal is to permit digital data to be stored and shared however, it is not edited. In this manner, blockchains serve as the base for immutable ledgers or the records that record transactions that are unable to be altered, deleted or destroyed. This is the reason blockchains are also referred to as an distributed ledger technology.

It was initially thought of as a research project in the year 1991 the concept of blockchain existed prior to its first application to widespread usage: Bitcoin, in 2009. Since then the blockchain concept has been used, its use has increased exponentially with the introduction of a variety of cryptocurrencies, decentralized finance (Defi) applications, non-fungible tokens (NFTs), and smart contracts.

  • Transaction Process
  • Aspects of Cryptocurrency
  • Blockchain Decentralization

Imagine that a business has a server farm that houses 10,000 computers that are used to manage the database which holds the entire client’s account details. The company also owns a warehouse that houses all of the computers in one place and is fully in charge of each computer and the information stored within the databases. It is, however, only one source of failure. What happens if the power in the area goes out? What happens if their Internet connection is interrupted? What happens if it burns to the floor? What happens if an intruder erases everything in a single keystroke? In all likelihood, it is likely that the data has been deleted or damaged.

What blockchains do:

It is allow the information stored in the database to be distributed across several network nodes in various places. This not only provides redundancy , but also preserves the integrity of the data stored in the database. If someone tries to alter data at one location of the database, all the other nodes will not be affected and therefore would stop any bad actors from doing this. If a user alters Bitcoin’s transaction records the other nodes will cross-reference and identify the node that has the wrong information. This helps create a precise and transparent sequence of events. This ensures that no element within the network is able to modify the information contained within it.

This is because the data and the history (such for transactions in the cryptocurrency) can never be changed. The record might include a list that contains transactions (such as in the cryptocurrency) however, it is possible for blockchains to contain a variety of other data, such as legal contracts, state-issued identifications, or even a company’s inventory of products.

To confirm any new entries or records added in a block, a majority of the network’s computing power will have to be in agreement with the process. To stop criminals from validating false transactions or double spending Blockchains are secured with a consensus mechanism, like the proof of work (PoW) or proof of stake (PoS). These mechanisms enable an agreement, even if no one node is in the midst of a dispute.


Due to the decentralization of Bitcoin’s blockchain, transactions are transparently visible via a private node or by using blockchain Explorers that let anyone observe transactions happening live. Each node is able to have its own version of the chain which is refreshed as new blocks are verified and added. Therefore, if you desire, you can follow bitcoin wherever it goes.

Exchanges for example were hacked previously, and those who stored Bitcoin on exchanges have been able to lose everything. While the hacker could be private, however, those Bitcoins that they stole can be easily tracked. If the Bitcoins that were stolen during one of these hacks were transferred or used in any way they would be identified.

The records kept in the Bitcoin blockchain (as with the majority of other blockchains) are protected by encryption. It means the person who is the owner of the record has the ability to decrypt it in order to identify themselves (using the public or private key pair). This means that blockchain users can remain anonymous while maintaining their transparency.

Is Blockchain Safe?

Blockchain technology offers the decentralization of security and trust through a variety of methods. In the beginning, it is that new blocks are stored in a linear and chronological manner. They will always be added at an “end” of the blockchain. Once a block is added to the” end” of the chain, it becomes very difficult to return and change the information contained in the block, unless a large majority in the blockchain has agreed to make the change. It’s because every block contains its very unique hash and its hash that was created by the block prior to it, and the mentioned time stamp. Hash codes are generated through the mathematical procedure that converts digital information into strings composed of letters and numbers. If that information is altered or altered in some way the hash code will change in the same way.

Let’s say that a malicious person is attempting to alter the blockchain so that everyone can gain cryptocurrency. If they alter their own copy of the blockchain that it wouldn’t be in sync with the other copies. If all other people cross-reference their copies to one another, they will notice that this copy stands out and the hacker’s copy of the chain will be deemed illegal.

The success of such an attack would require the hacker to simultaneously alter and control 51 percent or more replicas of the blockchain in order that their copy becomes the most popular copy and, consequently, the chain that was agreed upon. A successful attack like this would take a lot of money and resources because they’d need to duplicate all blocks as they will have distinct time stamps and hash codes.

Because of the sheer size of many cryptocurrency networks as well as the speed at which they are expanding The cost of pulling off such feats will be unaffordable. It’s not just costly but also ineffective. The act will not go unnoticed since network members would be able to see these drastic changes in the Blockchain. Network members would have to hard take the fork into a fresh model of the blockchain which hasn’t been affected. This could cause the affected variant of Bitcoin to drop in value, rendering the attack useless since the attacker is in control of an unvalued asset. This would be the case in the event that the person who is responsible was to target the latest version of Bitcoin. The system is designed to ensure that participating in the system is more financially rewarding than attacking it.