> For the complete documentation index, see [llms.txt](https://qualitax.gitbook.io/interop/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://qualitax.gitbook.io/interop/bridging-approaches/mechanisms/notary-schemes.md).

# Notary Schemes

A notary scheme relies on trusted third-party entities (notaries) to witness or attest to events on one blockchain and relay or validate that information on another blockchain.

**Example:** Let's say Company A wants to send data to Company B's blockchain. Instead of directly sending it, they rely on trusted notaries.

1. Company A sends a transaction on its blockchain.
2. A group of notaries monitors Company A's blockchain. Once they see the transaction, they sign a message or certificate confirming its validity.
3. This message, now signed by the notaries, is sent to Company B's blockchain.
4. Company B's blockchain has been set up to trust messages signed by these notaries. Seeing their signatures, the blockchain accepts the message as valid and processes the information.

In this scheme, trust is shifted from trust between Company A and B to trust in the notaries. If the notaries act maliciously or are compromised, the integrity of the communication is at risk.


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