> For the complete documentation index, see [llms.txt](https://www.vr9.io.vn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.vr9.io.vn/vi-digital-assets/quickstart-1/cong-nghe-blockchain-va-xac-thuc-da-yeu-to.md).

# Công nghệ blockchain và xác thực đa yếu tố