Blockchain technology is a decentralized, digital ledger that securely and permanently records transactions across a global network of computers. Instead of relying on a central authority like a bank to verify data, the network uses a peer-to-peer system where multiple computers (called nodes) collectively validate each transaction through complex cryptographic puzzles. Once verified, these transactions are bundled together into a digital "block" and given a unique cryptographic fingerprint, or hash, that connects it mathematically to the previous block. This chronological chaining makes the data immutable, meaning it cannot be altered, deleted, or falsified without changing every single block that follows it. Because the entire network shares an identical, live copy of this ledger, blockchain provides a high level of transparency and security, making it useful for cryptocurrencies, supply chain tracking, automated smart contracts, and digital identity verification.
Blockchain technology is a decentralized system that enables the secure recording and verification of transactions across a network of computers. Unlike traditional centralized systems where data is stored and controlled by a single authority, blockchain operates on a distributed ledger, where each participant in the network holds a copy of the entire blockchain. Transactions are grouped into blocks, which are then cryptographically linked together in chronological order, forming a chain. This chain of blocks ensures the integrity and immutability of the data, as altering any block would require changing all subsequent blocks, which is practically impossible due to the cryptographic hash functions used. Blockchain technology utilizes consensus mechanisms such as Proof of Work (PoW) or Proof of Stake (PoS) to validate and confirm transactions, ensuring that only valid transactions are added to the blockchain. The decentralized and transparent nature of blockchain makes it resistant to censorship and fraud, offering potential applications beyond cryptocurrencies, including supply chain management, voting systems, digital identity verification, and more.