Arbitrum docs
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Reference

Reference material on the sequencer and Arbitrum's Geth fork.

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Reference material on Arbitrum's internals, including the sequencer and Arbitrum's fork of Geth.

Geth at the core

How Nitro builds on a modified fork of Geth.

ArbOS reference

Precompile architecture, state storage, and pricing state.

STF inputs

The message types that feed the State Transition Function.

Finality and reorgs

How deep a reorg can go, and when data is safe to trust.

How is this guide?

ArbOS technical reference

Technical reference for ArbOS internals: precompile architecture, state storage, child chain pricing state, and Stylus execution details.