XMTP For otp sending message

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Hi all,

I’m currently building a blockchain-based Two-Factor Authentication (2FA) system for a project. The system uses TOTP (Time-based One-Time Passwords) and smart contracts to handle OTP verification on-chain.

I’m integrating XMTP to send OTP codes directly to users’ wallets as a secure, decentralized alternative to email or SMS. The flow is:

  1. User triggers 2FA (e.g., login or sensitive action).
  2. System generates a TOTP-based OTP.
  3. OTP is sent via XMTP to the user’s wallet address.
  4. User retrieves and enters the OTP.
  5. Smart contract verifies the OTP.

I’d appreciate feedback on:

  • Is XMTP reliable for time-sensitive OTP delivery?
  • Any best practices for using XMTP in auth flows?
  • Potential security or UX concerns?

Thanks in advance!

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