> For the complete documentation index, see [llms.txt](https://bridgem.gitbook.io/bridgem-1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bridgem.gitbook.io/bridgem-1/protocol/bridge-process.md).

# Bridge Process

The cross-chain process primarily employs atomic swap methods. In the current first phase, it supports the circulation of ERC20 Tokens between Bitcoin Layer2 and Ethereum Layer2.

1. Locking assets on the source chain primarily refers to ERC20 Tokens on Bitcoin Layer2 and ERC20 Tokens mapped by BRC20 on Ethereum Layer2.
2. Minting assets on the target chain involves either locking ERC20 Tokens to mint mapped ERC20 Tokens or locking mapped ERC20 Tokens to mint Tokens.
3. Redeeming assets on the original chain entails locking equivalent tokens on the target chain and completing the transaction on the other chain.

Liquidity providers play a crucial role by offering BRC20 Tokens and ERC20 Tokens. These liquidity providers may include, but are not limited to, project developers, market makers, the community, and investors.<br>

<figure><img src="/files/0bFCCVhZk1LrYZ8tVSHL" alt=""><figcaption></figcaption></figure>


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