QR Check-in

DropIn's QR check-in system prevents fraud while keeping the experience seamless for attendees.

How It Works

1. Organizer displays QR code on a screen at the venue

2. QR code rotates every 30 seconds with a new session token

3. Attendees scan with their phone camera

4. DropIn page loads, attendee connects wallet and checks in

Anti-Fraud Protection

Rotating QR Codes

The QR code changes every 30 seconds. If someone screenshots and shares it:

• The code expires before it can spread

• Claimers get an "expired" error

• Only people physically present can check in

One Wallet Per Event

• Each wallet can only check in once per event

• Duplicate attempts are automatically blocked

• Prevents sybil attacks

Token Validation

• Each QR contains a cryptographic session token

• Tokens are validated server-side

• Prevents replay attacks

For Organizers

Displaying the QR

• Use a large screen (TV, projector) visible to all attendees

• Ensure good lighting for easy scanning

• The QR auto-refreshes - no manual action needed

Monitoring Check-ins

Your dashboard shows:

• Total check-ins in real-time

• Individual wallet addresses

• Check-in timestamps

For Attendees

Scanning Tips

• Use your native camera app - no special app needed

• Hold steady for 1-2 seconds

• If it doesn't work, try moving closer or adjusting angle

• Make sure you're scanning the current QR (it changes every 30s)