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

# Chains

**Integration Technology Introduction:**

Ubit initially integrated with the Arbitrum chain, allowing users to connect their wallets and deposit on-chain assets into their Ubit exchange accounts without KYC, enabling easy trading anytime, anywhere. In the second phase, Ubit plans to integrate with over 20 major and minor public chains including ETH, BSC, TRON, Optimism, Solona, to meet users' convenience needs.

**Arbitrum Chain Introduction:**

Arbitrum is a Layer 2 solution that utilizes smart contracts and off-chain components to process transactions, then submits the processed results to Ethereum's main chain. In Arbitrum, users can create and execute smart contracts, make transfers, and other transactions, without directly using the Ethereum main chain. Validators and validation nodes in Arbitrum are responsible for verifying the correctness of the transaction data submitted to the main chain. These validation nodes are usually operated by specific entities or partner organizations to ensure the security and trustworthiness of the transactions. To support developers in building DApps and smart contracts on Arbitrum, it provides a range of developer tools and documentation, making application development and testing as convenient as possible for developers.