> For the complete documentation index, see [llms.txt](https://docs.gravity.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gravity.xyz/legacy-alpha-mainnet-l2/legacy-l2.md).

# Overview

Gravity launched in 2024 as **Gravity Alpha Mainnet**, an Ethereum rollup built on the Arbitrum Nitro stack with chain ID `1625`. Alpha Mainnet is still operational, but new development should target [Gravity Mainnet (L1)](/gravity-networks/l1-mainnet.md) (chain ID `127001`), which is the canonical production chain.

The pages in this section preserve the original L2 documentation:

* **Network references** — Alpha Mainnet & Alpha Sepolia Testnet network parameters and node-setup guides.
* **Bridging on L2** — how to bridge G, DAI, and WBTC to/from Alpha Mainnet through the native canonical bridge and LI.FI.
* **L2 token contracts** — ERC-20 addresses for G, wG, WBTC, DAI, USDT, USDC on Alpha Mainnet.
* **L2 system contracts** — rollup, inbox, outbox, sequencer, and gateway addresses.
* **Verify a Smart Contract (L2)** — Blockscout verification flow for contracts deployed on Alpha Mainnet.

## Migrating to L1

Holders of G on Alpha Mainnet can move to L1 by first withdrawing G as ERC-20 back to Ethereum through the [L2 canonical bridge](/legacy-alpha-mainnet-l2/bridge-to-gravity.md), then bridging from Ethereum to L1 — see [How to Get G](/the-g-token/how-to-get-g.md) for the L1 side of the flow.


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