> For the complete documentation index, see [llms.txt](https://crosschain-alliance.gitbook.io/hashi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://crosschain-alliance.gitbook.io/hashi/introduction/what-is-hashi.md). # What is Hashi? **Hashi** is a robust and innovative **EVM hash oracle aggregator** designed to significantly enhance the security of cross-chain applications. It leverages multiple independent oracles to validate and verify block headers and messages across different blockchain networks, ensuring a more secure and reliable way to facilitate interactions between chains. In a landscape where cross-chain bridges are prone to risks due to reliance on single points of failure, Hashi introduces an **additive security model**, where multiple oracles work together to ensure the integrity and authenticity of data relayed across chains. This approach minimizes vulnerabilities and strengthens the overall security of decentralized applications (dApps) that rely on cross-chain communication. #### **Key Features of Hashi** * **Multi-Oracle Validation**: Hashi aggregates the results from multiple oracles to validate block headers and messages, reducing the likelihood of failure due to malicious actors or faulty data. * **Cross-Chain Compatibility**: It supports multiple blockchain networks, including Ethereum, Gnosis Chain, and others, making it adaptable to a wide range of dApps and cross-chain use cases. * **Arbitrary Message Relaying**: Hashi allows for secure and scalable message relaying between chains, ensuring that cross-chain interactions are not only secure but also efficient. * **Additive Security**: The more oracles that participate in Hashi, the stronger the security, creating an increasing level of protection as the network grows. * **RIP-7755 Compatibility:** Hashi fosters standardization in the Cross-Chain interoperability landscape. In essence, Hashi provides an advanced layer of **security and reliability** for any project that relies on cross-chain data, offering developers peace of mind and more control over the security of their decentralized applications. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://crosschain-alliance.gitbook.io/hashi/introduction/what-is-hashi.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.