Making Sense of Blockchain and Cryptocurrency for Beginners

Blockchain has evolved from a niche technical concept into the infrastructure behind how millions of people transact, collaborate, and prove identity online. Understanding the basics doesn’t require a computer science degree — just a clear explanation, which is what we’ll give you here.

It's okay if you are still not able to get your head around what blockchain actually is because I’ll break down the topic for you in the next paragraph. Follow me! 

Imagine two friends like to spend time together and it happens sometimes one friend has money and sometimes the other one does. To spend fairly, they decide to keep a record of each expense in their ledgers (diaries or notepads). Since both friends have their own ledgers, they have to compare them at the end of each month and if there’s any mismatch, there’s no way to sort it out – except to rely on their own memory. To solve this issue, they decide to keep a “distributed ledger”, a single ledger that both will sign to verify every expense. For example, 

1. John paid for Pizza – $15: John’s Signature ______________ Robert’s Signature _________ 2. Robert paid for Phone Bills – $1200: John’s Signature _________ Robert’s Signature __________ 

In this way, the issue of mismatched transactions can be pretty much solved. The blockchain works in a similar way. It’s a digital distributed ledger that records transactions, except it records crypto transactions. 

Cryptocurrency is a digital currency that is pair-to-pair and decentralized. The transactions of cryptocurrencies are maintained on the blockchain. We need the Internet to send an email; likewise, blockchain is the Internet that is used to send cryptocurrencies. Since the transactions are recorded in a distributed ledger, everyone on the network verifies if the transactions are legit. 

“Martha sent 1 Bitcoin to Ali” 

Bitcoin is a cryptocurrency being sent and the transaction will be recorded on the blockchain. Blockchain will first verify if Martha has 1 Bitcoin in her wallet. After verification, the crypto is transferred to Ali and added to Ali’s already existing assets (if any). Since the blockchain is immutable (cannot be altered) and distributed (decentralized in nature), the technology is being used in NFTs, Cryptocurrencies, voting, supply chain management, and much more.

Blockchain Applications 

The information is saved in blocks that are chained together, and each blockchain has some storage capacity to hold the information from the transaction like a hash of the previous block, a hash of the current block, and the amount being transferred. As one block fills with enough records, it is connected to the chain of previous blocks.

There are two main kinds of blockchains – public and private chains. 

Private vs Public: 

Private chains are permissioned while public chains are permissionless. While dealing with cryptocurrencies like Bitcoin or Ethereum we interact with public chains as these are publically accessible by everyone, unlike the public chains. Public chains are purpose-built and can only be accessed by the allowed individuals. 

Is Blockchain Secure? 

Blockchain is run by a node of the crypto network following a consensus mechanism that makes every node verify the transaction before adding it to the block. If someone wishes to change a transaction to his favor, he can change his copy of the block but it will get caught in cross-referencing with other nodes’ copies and it will easily be shown that this is not a valid transaction. To record an invalid transaction in the blockchain, a user would have to own at least 51% of the active nodes to verify the transaction as valid. Since there are millions of miners active worldwide, it’s not possible even for larger organizations to own that many nodes. 

Blockchain earned its reputation as a buzzword, but it’s increasingly backed by real applications — and Bitcoin remains the clearest proof that the concept works at scale.