What is blockchain, exactly?

What is blockchain exactly
What is blockchain exactly

Blockchain explained

A blockchain is a distributed database that stores digital information shared by nodes in a computer network. In cryptocurrency systems like Bitcoin, blockchains are well-known for their critical role in keeping a secure and decentralized record of transactions. The unique thing about the blockchain is that it can keep data accurate and secure while also gaining trust without the help of a third party.

A blockchain’s data structure differs from that of a traditional database. The data is divided into “blocks,” each of which contains a collection of information. Forming a blockchain includes linking a fully closed block with a preceding block, forming a data chain. All the additional information added after that newly added block is compiled into a new block, which is then added to the chain after it is filled.

A database organizes information into tables, whereas a blockchain, as the name implies, organizes information into chunks (blocks) that are linked together. When implemented in a decentralized fashion, this data structure creates an irreversible data chronology. When a block is completed, it becomes permanent and becomes part of the timeline. Each block in the chain is assigned a unique timestamp when it is added to the chain.

Even if you simply have a passing interest in cryptocurrency, you’re bound to come across a few terms.

“Bitcoin” is the first. This is one of the most well-known and oldest of the many different types of cryptocurrencies that are out there today.

It’s also the most valuable in terms of the value of digital “coins” in circulation, with a market capitalization of £690 billion (as of March 28, 2022). You may learn more about bitcoin and its main competitors by clicking here.

“Blockchain” is the second phrase. This is a crucial component found in practically all cryptocurrencies.

But, exactly, what is blockchain? Check out the information you have been looking for about it.

In the crypto world, what is blockchain?

It’s a type of technology, primarily database technology, which is at the heart of practically all cryptocurrencies. Consider it a database that is dispersed across millions of machines over a global network. These machines are referred to as “nodes” in this context.

A blockchain makes it difficult to hack or cheat the system by spreading identical copies of a database across an entire network. While cryptocurrency is now the most common use of blockchain technology, it can be used for many other things.

At its core, the blockchain is a decentralized digital ledger that can store any type of data. A blockchain, for example, can keep track of bitcoin transactions and the ownership of non-fungible tokens (NFTs), a type of digital asset that represents real-world assets like one-of-a-kind works of art.

Even diamonds can be checked, and their history and provenance can be kept in a digital ledger called “blockchain” or “digital ledger.”

The information mentioned in the examples above can be stored in any normal database. The blockchain, on the other hand, is unique in that it is decentralized. Rather than being kept in one location, a blockchain database is duplicated and stored on several computers throughout a network.

How does the blockchain work?

The previously mentioned digital ledger is described as a “chain” made up of individual “blocks” of data. A new block is formed and linked into the chain as new data is contributed to the network.

To maintain consistency, all nodes (computers) must update their versions of the blockchain ledger. One reason the blockchain is thought to be very safe is because of how new blocks are made.

This is because before a new block can be added to the ledger, a majority of nodes must check and certify the legitimacy of the new data. In the case of bitcoin, this could entail checking that new transactions in a block aren’t fraudulent, or that coins haven’t been spent twice.

A standalone database or spreadsheet, on the other hand, allows updates to a single version to be made without qualification.

The block is added to the chain once consensus is attained, with the underlying transactions recorded in the distributed ledger. From the start of the ledger to the end, blocks are securely linked together, creating a digital chain.

Nodes are often given new amounts of the blockchain’s own currency as a reward for their work verifying updates to the shared data. This is called “node reward.”

There are two sorts of blockchains.

  1. Private
  2. Public

Anyone can participate in a public blockchain, which means they can read, write, or audit the data stored on it. It’s hard to change the transactions on a public blockchain because no one party owns all of the nodes.

Once managed by a company or group, it is classified as a private blockchain; the group chooses who is allowed to join the system and has the power to change the blockchain. A private blockchain is like an internal data storage system that is spread out across many nodes for extra security.

The blockchain and its applications

Blockchain technology has been used for many different things, from delivering financial services to running voting systems.


The technology that underpins Bitcoin, the first cryptocurrency, was created in 2008. The anonymous Satoshi Nakamato, possibly an individual or a group of people, was the brains behind Bitcoin’s invention. He released a paper on cryptocurrency as well as creating it.

Blockchain technology is most typically connected with cryptocurrencies like Bitcoin and Ethereum these days. The transactions that people make when they acquire, swap, or spend bitcoins are recorded on a blockchain.


Blockchain is being utilized to conduct transactions with traditional currencies such as pounds, dollars, and euros, in addition to cryptocurrencies. Because transactions can be checked and completed outside of normal business hours, this can be faster than traditional methods that require money to be sent through a bank or other financial institution, which can take longer.

Transfers of property

The blockchain can also be used to keep track of and transfer ownership of various assets. This is very common with digital assets like NFTs.

This also means that real-world assets, such as deeds to real estate, could be traded on the blockchain, too.

For example, in a real estate transaction, both the seller and the buyer might utilize the blockchain to fulfill their respective roles in the sales process, from validating ownership rights to completing and registering the deal. All of this can be done without having to manually update land records.

Contracts that are smart

Self-executing legal contracts, sometimes known as “smart contracts,” are another blockchain breakthrough.

When specific criteria are met, digital contracts like this would immediately go into effect. For example, if a buyer and seller have met all of the deal’s set requirements, the payment may be released immediately.

Monitoring the supply chain

Supply chains, especially when commodities are made and subsequently shipped throughout the world, generally entail significant volumes of data when they aren’t impeded by the pandemic. Tracing the root of problems using traditional data storage methods might be tricky. For instance, in the case of a seller who sells low-quality goods,

Using blockchain to store supply data can make it easier to track which commodities come from which sources.

If you want to know where your food comes from, IBM’s Food Trust is a network of growers and processors, distributors, manufacturers, and retailers who use blockchain technology to keep track of food origins, transaction data, and processing information.


Blockchain technology could also be used to stop election fraud by letting people vote with votes that can’t be changed.

Blockchain Advantages

Transaction accuracy has improved.

Multiple nodes verify blockchain transactions, which helps to reduce errors. If one node has a database issue, the others should notice that it’s different and pick up on the fault.

This is in sharp contrast to how a traditional database operates, where an individual’s inaccuracy is more likely to slip through the cracks. Furthermore, each asset is identified and monitored separately on the blockchain ledger. This eliminates the possibility of assets being double-counted.

Intermediaries are rendered obsolete.

Without the assistance of a third party, two parties can confirm and complete a transaction using blockchain. This will allow you to save both time and money. If, for example, someone wants to buy something, a bank isn’t required to act as an intermediary and help them.


In theory, a decentralized network like a blockchain should make it nearly impossible for someone to commit fraud.

Every node would have to be hacked and every ledger altered in order to fabricate a transaction. While this isn’t impossible, many cryptocurrency blockchain systems use transaction verification methods such as “proof-of-stake” or “proof-of-work,” which make it difficult – and not in a participant’s best interests – to add fraudulent transactions.

Transfers that are efficient

As a result, people can make money and asset transfers more quickly and without having to rely on a third party, such as a bank or a government department, to check the process.

Blockchain’s disadvantages

Transaction time limits

The speed at which a blockchain can move is limited because it relies on a wider network to authorize transactions. Furthermore, as the volume of transactions grows, network speed difficulties arise. As a result, scalability will be an issue until the situation improves.

The price of energy

When all of the nodes are working to validate transactions, it takes a lot more energy than a single database or spreadsheet. This is especially important these days when electricity costs are so high.

Asset loss is a possibility.

Cryptographic keys are used to secure some digital assets, such as cryptocurrencies housed in a blockchain wallet. Keys must be carefully secured in any decentralized system. That’s because if a digital asset’s owner loses his or her key, there’s no way to recover it, and the item could be lost forever.

Illegal behavior

The decentralization of blockchain adds a layer of privacy and confidentiality, making it appealing to criminals. Illicit transactions are more difficult to track on blockchain than they are at banks, where accounts are linked to a person’s name.

Is blockchain an option for me to invest in?

No, no, no! This is due to the fact that it is merely a system for storing and processing transactions. However, you can invest in assets and businesses that employ this technology.

Purchasing cryptocurrencies such as Bitcoin and Ethereum, as well as other blockchain-based tokens, is the simplest method. More information on how to buy cryptocurrency may be found here.

It should be noted, however, that cryptocurrency investment is not for everyone. The UK’s financial watchdog warns people who want to trade in crypto assets that they should be prepared to lose all of their money if they decide to invest in crypto assets.

Another alternative is to invest in blockchain-based businesses. Banco Santander, for example, said in 2019 that it had issued the first $20 million “end-to-end blockchain bond.”

Considering the future

Blockchain is still considered a niche technology by some, similar to the early days of the internet. Others say that blockchain technology is growing quickly and becoming more popular, and there are no signs that it will slow down.

In Deloitte’s 2021 Global Blockchain survey, they say that blockchain can be used in a wide range of industries and applications, which is making digital assets grow faster.

People in some governments have been trying out blockchain technology in a wide range of areas, like land registration and welfare benefits. It has also been used in food supply chains, government procurement, and identity management.

Because of these advancements, as well as blockchain’s potential scalability across multiple industries, there’s a good chance the technology will soon change the way we transact and engage with one another.

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