> For the complete documentation index, see [llms.txt](https://docs.sign-web.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sign-web.app/certification.md).

# 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.