Blockchain is a phrase you would be familiar with if you have been involved in banking, investment, or cryptocurrencies over the previous ten years. Essentially, this is the technology that underpins the Bitcoin network’s record-keeping system. However, the basic meaning of blockchain is frequently completely baffling. A blockchain is “a distributed, decentralised, public ledger,” according to the official definition. Not much is explained, is it?
We will now discuss the specifics of this procedure and how it operates in the virtual world. And we want it to be thorough enough for everyone.
Introduction about Blockchain
Basically, a blockchain can literally be seen as a chain of blocks. But not in the traditional context of the words. Here we definitely are talking about a block and chain. However, the block here refers to digital information. While the chain depicts the public database, it is stored in. The blocks are created out of digital segments of information. Specifically, there are three parts to that information:
- Blocks store data about transactions. Such as the time, date, and amount of cash paid for a recent purchase.
- They also have information about the participants involved in a transaction. A block for purchase would record the name of the brand as well as the customer. However, instead of an actual name, it is recorded without any identifying data. This is done by using a specific digital signature, which is similar to a username.
- Blocks accumulate data that distinguish each one from the other. Just like people have names to set them apart, each block has a code called the hash. That makes it distinguishable from other blocks. Hashes are cryptographic codes that are made out of exclusive algorithms. For instance, a customer is making a purchase from an online store. During the transit, they decide to buy something more. The details of the transaction would look nearly the same in the blocks. Yet each will have a different code that will highlight they aren’t the same.
To make it easier to understand, the examples we have given above encompass a single transaction. In reality, the numbers are slightly different. A single block on a blockchain for Bitcoin can store one MB of information. Depending on the size of transactions, a single block can hold several thousand transactions. Read more
How do Blockchains work?
When a block stores new information, it is included in the blockchain. As the name suggests, the chain consists of a number of blocks strung together. For this to happen, four things are responsible:
- A transaction should occur. A block gathers together thousands of transactions being made in a virtual store. This means that any purchase you make will be packaged in a block along with other user’s transaction data.
- A transaction needs to be verified. After a purchase has been made, the transaction is always verified. That is the job of a network of computers. Once a purchase has been made, the network proceeds to check if the transaction is happening properly. They confirm the purchase’s details, transaction time, dollars paid, and participants.
- The transaction has to be stored within a block. After the transaction has been checked to be accurate, it receives the green light. The customer’s digital signature, dollar amount, and the brand’s digital signature are all saved in a block. The transaction will join thousands of other transactions there.
- The block must be provided with a hash. When all its transactions are verified, the block must receive an identifiable code. It is then added to the rest of the blockchain.
When a block is added to the chain it becomes visible to the public. Even to the customer themselves. You acquire access to all transaction data on Bitcoin. All the information like when, where, and done by whom is on a blockchain.
Pros and Cons of a Blockchain
Although complex, the potential of a blockchain’s record-keeping procedure is limitless. Here are some of the advantages and disadvantages associated with it.
Transactions on a blockchain are solely based upon computer networks. This means that the process is mostly free of direct human involvement. This results in less chance of errors and an accurate information record.
Cost Reduction
Using blockchains takes away the need for a third-party to verify transactions. This leads to lessening the costs associated with it. For instance, business owners acquire a small fee when they accept credit card payments for banks to process transactions.
Bitcoin is a perfect example of the inefficiencies that might occur in the blockchain. The “proof of work” system adds a new block in about ten minutes to the blockchain. At this rate, the blockchain network is only able to manage 7 TPS or transactions per second. Although other cryptocurrencies like Ethereum work better than bitcoin, their blockchain processes are still limited.
Illegal Activities
Confidentiality on the blockchain networks secures the users from getting hacked or trespass of privacy. But this also allows for illegal activity and trading on a blockchain. It can be used to illicit business on the “dark web”. Silk Road, an online marketplace, that was shut down by the FBI a few years ago is a perfect example of it. It allowed users to browse their site without tracking identification. Furthermore, unlawful purchases could be made with the use of bitcoins.
Future of blockchain
Blockchain has undergone its fair share of public scrutiny since its inception in 1991. Since then, numerous useful applications of this technology have been found and investigated. It now has the potential to improve the security, precision, and efficiency of corporate and government operations. It is no longer a question of “if” businesses will adopt this technology. The question today is “when” will they, not “if.”
Real Uses of Blockchain Beyond Bitcoin
Blockchain is used for more than money. In supply chains, companies use blockchain to track food from the farm to the shop. If a batch of food is unsafe, they can find where it came from in minutes. In land records, some governments store property titles on a blockchain so they cannot be changed in secret. In digital identity, a blockchain can hold proof of who you are without a central database. In voting, some trials use blockchain to make votes harder to tamper with. In healthcare, patient records can be shared safely between hospitals. In art, NFTs use blockchain to prove who owns a digital work. Smart contracts are programs on a blockchain that run by themselves when conditions are met. Ethereum is the best-known platform for smart contracts. These uses are real, but they are still new. Many are in trials, not in daily use.
Proof of Work vs Proof of Stake
Blockchains need a way to agree on which transactions are valid. The oldest way is proof of work. Miners solve hard puzzles with computers. The first to solve it adds the next block and earns a reward. Bitcoin uses proof of work. It is secure, but it uses a lot of electricity. The newer way is proof of stake. Instead of solving puzzles, people lock up coins as a stake. The network picks one of them to add the next block. Ethereum used proof of work until September 2022. Then it switched to proof of stake in an event called The Merge. The switch cut Ethereum’s energy use by more than 99 percent. Most new blockchains use proof of stake or a similar method. Proof of work is still used by Bitcoin, and it remains the most tested method.
Public vs Private Blockchains
Not all blockchains are open to everyone. A public blockchain, such as Bitcoin or Ethereum, lets anyone join, read the data, and add transactions. No one is in charge. A private blockchain, also called a permissioned blockchain, is run by one company or a group of companies. Only approved members can join. Hyperledger Fabric is a well-known private blockchain platform. Companies use it for supply chains and trade finance. Public blockchains are open and hard to censor. Private blockchains are faster and easier to control, but they are less decentralised. The right choice depends on the job. A public blockchain suits money that anyone should be able to use. A private blockchain suits a group of companies that already trust each other.
What Blockchain Is Not Good For
Blockchain is not the answer to every problem. A normal database is faster, cheaper, and easier to use. If you trust one party to keep the records, you do not need a blockchain. Storing large files on a blockchain is expensive. Most blockchains store only a small amount of data per block. A blockchain is also hard to change. Once data is written, it stays there. That is good for records, but bad for mistakes. If you write the wrong data, you cannot fix it easily. You can only add a correction. Many companies that tried blockchain found that a simple database did the job better. Use a blockchain when you need shared records that no one party controls. For most other jobs, a database is enough.
Frequently Asked Questions
What is blockchain actually good for?
It is good for shared records that no one party should control, such as money transfers, supply chain tracking, land records, and digital identity. It is not needed for every database.
Does Bitcoin charge transaction fees?
Yes. Bitcoin transactions have fees that go to miners. Fees change with network demand. They are usually small, but they are never zero.
What is the difference between proof of work and proof of stake?
Proof of work uses miners solving puzzles, which takes a lot of electricity. Proof of stake uses people locking up coins to validate transactions. Ethereum switched to proof of stake in September 2022, cutting its energy use by more than 99 percent.
What is a smart contract?
A smart contract is a program on a blockchain that runs by itself when its conditions are met. Ethereum is the best-known platform for smart contracts.
When should I not use blockchain?
When a normal database will do the job. A database is faster, cheaper, and easier to change. Use a blockchain only when you need shared records that no one party controls.
Disclaimer: This guide is for general information only. This guide gives no investment advice for readers. Cryptocurrency prices and blockchain projects change fast. Do your own research before you buy or invest.
Last Updated: 6 November 2026