# NethermindEth/nethermind

A robust, high-performance execution client for Ethereum node operators.

Repository: https://github.com/NethermindEth/nethermind
Canonical: https://ross.abutalabs.com/products/nethermind
Homepage: https://nethermind.io/nethermind-client
Language: C#
License: GPL-3.0
License Family: copyleft
Topics: ethereum, blockchain, evm, ethereum-client, eth
Last push: 2026-08-26T19:47:36+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 96, longevity 100
- inputs: {"age_days": 3297, "days_push": 7, "days_rel": 27, "gap_med": 11.0, "n_releases_24m": 47}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1588, forks 722 (observed 2026-08-28T04:05:07.837957+00:00)

## What it is
Nethermind is a high-performance Ethereum execution client built on .NET, in production since 2017. It offers fast snap sync, high-throughput JSON-RPC over HTTP/WebSocket/IPC, and a plugin system for extending the client with new networks, consensus algorithms, and RPC namespaces without forking.

## Use cases
- run an Ethereum mainnet execution node
- sync an Ethereum node quickly to the chain tip
- operate an OP Stack rollup node without a separate op-node
- serve JSON-RPC requests for a dApp backend
- improve Ethereum client diversity in a staking setup
- extend an Ethereum client with custom transaction types or RPC modules
- monitor node health with Prometheus metrics
- run a Gnosis or Linea node

## When to choose
- you need a production-grade Ethereum execution client on Linux, Windows, or macOS
- you want fast initial sync via snap sync
- you operate OP Stack rollups and want an integrated rollup node
- you need a plugin architecture to customize the client without forking
- you value client diversity for network resilience

## When to avoid
- you need a consensus/validator client rather than an execution client
- you want a lightweight resource-constrained node for embedded devices
- your team has no .NET ecosystem familiarity and prefers Go or Rust clients
- you need a non-Ethereum blockchain client

## Facets
- artifact type: application
- maturity: stable
- function: http-server, rpc, websocket, plugin-system, monitoring, cryptography, networking, cli
- domain: blockchain, microservices, infrastructure-as-code, self-hosted, developer-tools
- platform: windows, dotnet, cross-platform
- tags: ethereum, execution-client, evm, -rpc, snap-sync, rollup, op-stack, l2, client-diversity, node-operator, zk, prometheus-metrics, cryptocurrency, linux, macos, docker

## Member repositories
- NethermindEth/nethermind (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:07.837957+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:54:59.310010+00:00, confidence not recorded.
  - readme: https://github.com/NethermindEth/nethermind (fetched 2026-08-28T04:05:07.837957+00:00, sha c5a1d9c5976c)
  - homepage: https://nethermind.io/nethermind-client (fetched 2026-08-29T11:25:40.447354+00:00, sha 0221d0922963)
  - site_page: https://www.nethermind.io/about-us (fetched 2026-08-29T11:25:40.457171+00:00, sha 6c0925adda8f)
  - site_page: https://docs.nethermind.io/ (fetched 2026-08-29T11:25:40.459241+00:00, sha 2c896d857df2)
- Data as of 2026-08-30T08:39:29.467469+00:00.