> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sophon.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Legacy Chain Development

> Archived Sophon Chain developer documentation

<Warning>
  The Sophon Chain is being wound down, and new deposits have been disabled since
  June 25, 2026. Do not start a new production deployment on Sophon. Sophon's new
  applications are being built on Base.
</Warning>

This section preserves the Sophon v1 network, contract, EVM-compatibility, and tool
documentation for teams maintaining an existing integration during the wind-down.

<CardGroup cols={2}>
  <Card title="Network Information" icon="computer" href="/build/network-information">
    Access the legacy RPC, chain ID, and explorers.
  </Card>

  <Card title="EVM Compatibility" icon="microchip" href="/build/evm-compatibility">
    Review the legacy chain's EVM compatibility.
  </Card>

  <Card title="Contracts" icon="pen" href="/build/mainnet">
    Find the Sophon v1 chain contracts.
  </Card>

  <Card title="Migration" icon="arrow-right-arrow-left" href="/migration">
    Review the chain timeline and asset-withdrawal process.
  </Card>
</CardGroup>