# otterscan/otterscan

A blazingly fast, local, Ethereum block explorer built on top of Erigon

Repository: https://github.com/otterscan/otterscan
Canonical: https://ross.abutalabs.com/products/otterscan
Homepage: https://otterscan.io
Language: TypeScript
License: MIT
License Family: permissive
Topics: ethereum, blockchain, blockexplorer
Last push: 2026-02-02T19:16:20+00:00

## Health v2 (maintenance only)
Score: 64/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 65, release rhythm 43, longevity 100
- inputs: {"age_days": 1889, "days_push": 212, "days_rel": 300, "gap_med": 77, "n_releases_24m": 6}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1420, forks 213 (observed 2026-08-28T04:04:40.514254+00:00)

## What it is
Otterscan is an open-source, fast, local Ethereum block explorer built as a React app designed to run alongside an Erigon archive node. It queries your own node for privacy and speed, using custom JSON-RPC methods to reduce network overhead.

## Use cases
- explore ethereum blocks and transactions locally
- private block explorer that doesn't leak my IP to third parties
- run a laptop-friendly ethereum explorer with erigon
- look up transaction details on optimism superchain
- self-hosted alternative to etherscan
- decode contract method selectors and verify source code
- inspect blockchain state without running extra indexers

## When to choose
- you already run or plan to run an Erigon archive node
- privacy matters and you don't want to send queries to third-party explorers
- you want a lightweight, open-source Etherscan alternative
- you need fast local block exploration on modest hardware

## When to avoid
- you don't want to run your own archive node
- you need token analytics or exchange-style features of commercial explorers
- you use a node client other than Erigon without custom RPC support

## Facets
- artifact type: application
- maturity: active
- function: search-engine, developer-tools, http-client
- domain: blockchain, developer-tools, self-hosted
- platform: self-hosted, cross-platform
- tags: ethereum, block-explorer, erigon, privacy, local-first, react, cryptocurrency, web-server, docker

## Member repositories
- otterscan/otterscan (main) score 64

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:40.514254+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 2026-08-30T04:37:49.329444+00:00, confidence not recorded.
  - readme: https://github.com/otterscan/otterscan (fetched 2026-08-28T04:04:40.514254+00:00, sha 834e59b9804f)
- Data as of 2026-08-30T08:39:29.467469+00:00.