> For the complete documentation index, see [llms.txt](https://satoshichain.gitbook.io/satoshi-chain/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://satoshichain.gitbook.io/satoshi-chain/developers/4.3-satoshichain-design.md).

# 4.3 SatoshiChain Design

As shown above, the Bitcoin blockchain and the SatoshiChain have a symbiotic relationship. In particular,

* Users can lock their Bitcoin on the cross-chain protocol to receive $SAT on the SatoshiChain blockchain. 
* Users can use $SAT to deploy and interact with smart contracts, pay transaction fees, and participate in the governance of SatoshiChain. 
* Users can destroy $SAT and reclaim their native Bitcoin.