> For the complete documentation index, see [llms.txt](https://vincechain.gitbook.io/vince-chain-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://vincechain.gitbook.io/vince-chain-documentation/3.-vince-chain-protocols/concepts/chain-id.md).

# Chain ID

Every blockchain differs from one another. A Chain Identifier (Chain ID) is a set of values or numbers that is unique for every blockchain and can be used to distinguish different chains. Chain ID could be very resourceful when transactions are on different blockchains simultaneously. Vince Chain’s Chain ID complies with the EIP155 format.