> For the complete documentation index, see [llms.txt](https://docs.most.wtf/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.most.wtf/architecture-overview/hdp-integration.md).

# HDP Integration

Herodotus Data Processor (HDP) is a crucial component of Most Bridge's security system. It provides a way to cryptographically verify that a transaction has occurred on one blockchain and prove it on another, without requiring complex consensus mechanisms between the two chains.

## How HDP works

1. **Transaction Recording**: When a Market Maker fulfills your intent on the destination chain, the details of this transaction are stored in the blockchain's state in our Payment Registry contract.
2. **Proof Generation**: The Market Maker then generates a proof of this storage state, which includes cryptographic evidence that your transaction was included in the blockchain.
3. **Verification**: This proof is submitted to the source chain, where it can be verified without needing to directly access the destination chain.
4. **Fund Release**: Once verified, the proof allows the locked funds to be released to the Market Maker on the source chain.

## Benefits of HDP

* **Security**: Provides cryptographic certainty that your transaction was completed.
* **Efficiency**: Allows for fast verification without waiting for long confirmation periods.
* **Scalability**: Works across different types of blockchains without requiring special compatibility.