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Introduction and overview

Nethermind is a high-performance Ethereum execution client built on .NET. It provides fast sync, high-throughput JSON-RPC, and a plugin system for extending the client without forking. In production since 2017.

Runs on Linux, Windows, and macOS.

Capabilities​

Nethermind connects operators to the Ethereum network via JSON-RPC over HTTP, WebSocket, and IPC. Snap sync, enabled by default, reaches the chain tip up to 10x faster than traditional fast sync. Node health and performance are exposed through a built-in UI and Prometheus metrics.

  • Performance: The EVM is optimized for low-overhead block processing: direct opcode dispatch, hardware-accelerated bitwise operations, and zero heap allocation on the execution stack. A parallel pre-execution system warms state reads before a block's main loop, cutting block processing time roughly in half.

  • Modularity: Every component of the Nethermind is independently extendable without forking the codebase. The plugin system lets teams add consensus algorithms, transaction types, network protocols, and RPC namespaces through a .NET assembly that loads on startup. Nethermind uses this same system internally for L2 network support and health checks.

  • Client diversity: The Ethereum protocol becomes more resilient when no single node implementation dominates. A bug in any one implementation cannot cause the network to finalize a bad block if multiple independent clients are running.

  • L2 and rollup native: Each supported L2 network is implemented as a plugin, so the core stays untouched. For OP Stack operators, a rollup node is built directly into the client, fully replacing the separate op-node and cutting services from two down to one.

  • ZK-readiness: ZK proving is being built directly into the production execution client. Execution witness capture, stateless block replay, and a minimal EVM binary are complete. See the ZK roadmap for current status.