# Glossary #### Src chain The source chain requests data and receives the result. #### Destination chain The chain from where data is requested and the query is executed through the Relayer and returned to the Src chain. #### User Contract A contract is defined by the developer, which is the calling source of the Gateway API. #### Gateway Contract The contract endpoint requests data acquisition. #### Light Client Contract A contract that verifies data and can build its logic. #### Relayer An intermediary between the src chain and the destination chain, which acquires proof for the destination chain and sends the data to the src chain. #### Storage proof A cryptographic commitment is used to prove that a storage value or transaction has been committed to the blockchain tree and that it is valid. #### Konoha A module for retrieving the appropriate block header for each ecosystem. The default is Chainlink Oracle, with the possibility of using ZK Coprocessors such as Largange or Herodotus in the future. --- # Agent Instructions: 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: ``` GET https://futaba.gitbook.io/docs/references/glossary.md?ask= ``` The question should be specific, self-contained, and written in natural language. 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.