Enterprise-grade Ethereum client developed by the Hyperledger Foundation supporting both public and permissioned private blockchain deployments with pluggable consensus mechanisms including Proof of Work, Proof of Authority (Clique/IBFT), and Practical Byzantine Fault Tolerance (PBFT). Besu provides full EVM compatibility, privacy extensions via private transaction groups, permissioning, and a JSON-RPC/WebSocket API surface, making it suitable for enterprise consortia, regulated financial networks, and cross-chain interoperability scenarios.