What is Blockchain?
A blockchain is a distributed digital ledger that records transactions across a network of computers in a way that is transparent, immutable, and decentralized.
What is Blockchain?
A blockchain is a type of distributed database or ledger that is shared and synchronized across many computers. Unlike traditional databases controlled by a central authority, a blockchain is maintained by a network of nodes (computers) that each hold a copy of the entire chain.
How Blockchain Works
Data is grouped into "blocks," each containing a set of transactions, a timestamp, and a cryptographic hash of the previous block. This chaining of blocks makes tampering virtually impossible — changing one block would invalidate all subsequent blocks.
Key Properties
- Decentralization: No single entity controls the network.
- Immutability: Once data is written, it cannot be altered.
- Transparency: All transactions are publicly verifiable.
- Security: Cryptographic hashing protects data integrity.
Real-World Applications
Beyond cryptocurrency, blockchain powers supply chain tracking, digital identity, voting systems, smart contracts, and decentralized finance (DeFi).