Goal

• Improve SIWF reliability
• Design in a way that accommodates other clients in the future, but don’t add that scope now

Spec/relay changes

• Shorten SIWF URL scheme to simplify the QR code
  • Shorten channel tokens to 8 characters
  • Pass SIWE parameters through relay channel
• Use GRPC hub client in relay
• Add user agent + origin IP to channel data

Warpcast client changes

• Introduce in-app QR scanning
• Add “enter code in app” flow

Investigating

• Relay/Hub latency

Design

Two main changes: aggressively reduce the length of the QR code URL for improved legibility and introduce an “enter code in app” flow similar to magic link/Netflix TV login.

In addition to providing a fallback for Warpcast users who have difficulty scanning QR codes, web only clients like Supercast could implement an “enter code in app” flow on web.

Shorten SIWF URL