# Certification - [File Certification](https://docs.sign-web.app/certification/file-certification.md): The File Certification page allows you to certify any file or document in any format and size on Waves Blockchain. - [Email Certification](https://docs.sign-web.app/certification/email-certification.md): The Email Certification page allows you to send emails to multiple recipients with attachments using your credentials or an open SMTP. This will certify the email message-ID on the Waves Blockchain. - [Multi-party Agreement](https://docs.sign-web.app/certification/multi-party-agreement.md): The File Certification page allows you to certify any file or document in any format and size on the Waves Blockchain. - [Verification Explorer](https://docs.sign-web.app/certification/verification-explorer.md): The verification explorer allows anyone, without needing to be connected, to search and verify the validity of a File Certification, Email Certification or Multiparty Agreement. --- # 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://docs.sign-web.app/certification.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.