> For the complete documentation index, see [llms.txt](https://docs.baasid.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.baasid.io/authorization-based-on-blockchain/key-point-and-technology-of-authentication-2fa-and-mfa.md).

# Key point & Technology of Authentication / 2FA & MFA

<figure><img src="/files/rS01Y0aoYp0QpfuYMC5l" alt=""><figcaption><p>Blockchain service that shows other limitations of centralization</p></figcaption></figure>