> For the complete documentation index, see [llms.txt](https://xdocs.ngd.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xdocs.ngd.network/bridge/messaging-bridge.md). # Message Bridge The MessageBridge enables the secure relay of arbitrary data between Neo N3 and Neo X. Instead of transferring tokens, it transports raw message payloads submitted by contracts or users, while preserving ordering, authenticity, and verifiability. As with the TokenBridge, each message direction (N3 → Neo X and Neo X → N3) maintains its own independent hash chain. Every message extends this chain, producing a new `(nonce, root)` commitment that validators reconstruct and sign. These signed commitments allow the relayer to submit authenticated message batches to the destination chain, where they are verified and persisted. Through its hash-chain mechanism and validator-attested batches, the MessageBridge provides the same security guarantees for arbitrary data as the TokenBridge provides for token transfers. This ensures that cross-chain messaging remains transparent, ordered, and cryptographically verifiable. The following sections and [Neo X's bridge SDK](https://github.com/bane-labs/bridge-sdk-ts) will help you to understand and build with this unique infrastructure step by step. For more detailed examples, please refer to the [MessageBridge Examples Repository](https://github.com/AxLabs/bridge-examples-ts). --- # 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 dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://xdocs.ngd.network/bridge/messaging-bridge.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.