Millions of customer data are hacked - Dutch SA fines Booking.com for delay in reporting data breach (2020) - European Union.

Problem When booking a hotel through platforms like Booking.com or Airbnb, users must submit personal information such as names, nationality, gender, and passport number. While hotels are legally required to verify this information upon check-in, booking platforms enforce their own policies requiring users to share this sensitive data, ostensibly to pass it on to hotels for verification (by manually match the name, gender and other personal information).

There is a better way by leveraging ZKP and SSI to create a booking proof (encrypt the booking information like booking ID, check-in, check-out date etc), which can be verified when guests arrive in the hotel using their phone to scan a QR code for instance. Hotel can still verify guest's ID and know who is actually checking in, but the booking platform won't be touch our sensitive information anymore.