Blockchain is a decentralized digital ledger that records transactions securely.
Data is stored in blocks, linked together, and secured using cryptography.
Immutability, transparency, and decentralization define blockchain.
It began with Bitcoin in 2009, created by Satoshi Nakamoto.
Public, private, and consortium blockchains serve different needs.
Blockchain reduces fraud and increases trust in transactions.
Scalability and energy consumption are ongoing issues.
Used in healthcare, voting, and identity verification.
Agreement protocols ensure all nodes validate transactions.
Blockchain could transform industries globally.