Blockchain and cryptography

Blockchain Overview & it’s Characteristics.


Blockchain is a revolutionary technology that acts as a secure and transparent digital ledger. It records transactions in a decentralized manner, making it nearly impossible to alter past records. With its potential to redefine various industries, blockchain brings trust, security, and efficiency to digital processes.

The key characteristics of blockchain include:


Instead of relying on a central authority like a bank or government, a blockchain operates on a network of nodes (computers) spread across the world. Each node maintains a copy of the entire blockchain, and they work together through consensus algorithms to validate and add new blocks to the chain.


Blockchain uses cryptographic techniques to secure transactions and prevent unauthorized changes to the data. Each block contains a unique cryptographic hash that links it to the previous block, creating an irreversible chain. This makes it difficult for anyone to alter past transactions without the consensus of the majority of the network.

Transparency and Immutability:

Once a block is added to the blockchain, it becomes practically impossible to alter the data within that block. This immutability ensures the integrity of the recorded information and provides transparency, as all participants in the network can view the transaction history.

Consensus Mechanisms:

Blockchain networks rely on consensus mechanisms to agree on the validity of transactions and the addition of new blocks. Popular consensus mechanisms include Proof of Work (PoW), used in Bitcoin, and Proof of Stake (PoS), used in various other blockchain platforms.

Smart Contracts:

Some blockchain platforms, like Ethereum, support smart contracts. These are self-executing contracts with predefined rules and conditions. Smart contracts allow for the automation of complex processes, such as financial transactions, without the need for intermediaries.