What is it?

Otterscan is a block explorer for EVM chains designed to run locally with an archive node companion - more specifically, Erigon.

This approach brings many advantages, as follows.

Privacy

You are querying your own node, so you are not sending your IP address or queries to an external, third-party node.

Fast

Since you are querying your local archive node, everything is fast. No network roundtrips are necessary.

Actually, very fast

This software was designed to be a companion of Erigon, a blazingly fast archive node.

Really, it is even faster

The standard web3 JSON-RPC methods are quite verbose and generic requiring many calls to gather many pieces of information at client side.

We've implemented some custom methods at the rpcdaemon level, so less information is needed to be JSON-marshalled and transmitted over network.