Blockchain Beyond Cryptocurrency: Teknologi Distributed Ledger

Blockchain adalah distributed ledger technology yang mencatat transaksi secara immutable dan transparent. Arsitektur: setiap block berisi data transactions, timestamp, hash dari block sebelumnya, dan nonce. Consensus mechanisms: Proof of Work (Bitcoin mining), Proof of Stake (Ethereum 2.0), Practical Byzantine Fault Tolerance, dan Delegated PoS. Karakteristik: decentralization (no single point of failure), transparency (public verification), immutability (cannot alter history), dan security (cryptographic hashing). Smart contracts adalah self-executing contracts dengan terms directly written in code, running on blockchain seperti Ethereum, Solana, atau Polygon. Use cases beyond crypto: Supply Chain Management (track product dari manufacture ke consumer dengan transparency penuh), Healthcare (patient records yang secure dan interoperable), Digital Identity (self-sovereign identity), Real Estate (tokenized property ownership), Voting Systems (transparent dan tamper-proof), dan Intellectual Property (proof of creation dan ownership). Enterprise blockchain: Hyperledger Fabric untuk permissioned networks, R3 Corda untuk financial services. Development tools: Solidity untuk Ethereum smart contracts, Truffle/Hardhat untuk development framework, Web3.js untuk interact dengan blockchain, dan MetaMask untuk wallet integration. Challenges: scalability (Ethereum handles ~15 TPS vs Visa 65,000 TPS), energy consumption (PoW very intensive), regulatory uncertainty, dan user experience complexity. Layer 2 solutions seperti Lightning Network dan Polygon mengatasi scalability issues. Blockchain bukan silver bullet tapi powerful untuk use cases requiring trustless verification dan audit trails.