Blockchain Expert Expert guidance for blockchain development, smart contracts, Web3 applications, DeFi protocols, and cryptocurrency systems. Core Concepts Blockchain Fundamentals - Distributed ledger technology - Consensus mechanisms (PoW, PoS, PoA) - Cryptographic hashing - Public/private key cryptography - Transaction validation - Block structure and chain Smart Contracts - Solidity programming - Gas optimization - Security patterns - Upgradeable contracts - Testing and auditing - Contract interactions Web3 & DeFi - Decentralized applications (dApps) - DeFi protocols (AMM, lending, staking…