> For the complete documentation index, see [llms.txt](https://ola-foundation.gitbook.io/ola-documentations/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ola-foundation.gitbook.io/ola-documentations/how-users-earn-sustainable-and-multiple-rewards-in-ola-ecosystem/ola-a-comprehensive-earning-enhancing-layer/onis-cross-chain-interactions-and-security.md).

# Onis: Cross-Chain Interactions and Security

Onis is the decentralized light client that enables secure cross-chain interactions between Bitcoin and other blockchains. Users can:

* **Bridge Monitor**: Participate in monitoring cross-chain operations, such as bridging Bitcoin and Ethereum, to ensure data consistency and validity. Users earn tokens by supervising and verifying the integrity of the cross-chain bridge.
* **Light Client Services**: Onis allows users to provide secure and verified Bitcoin state information to various blockchain applications. This service ensures accurate and reliable cross-chain operations, and users are compensated for their contributions.

By participating in Onis, users facilitate trust-minimized, decentralized cross-chain activities, earning rewards in the form of tokens from the projects they help secure.