Oh, I have experience with OCRA tokens! I used them in one of my data protection projects. They provide an extra layer of security by generating one-time codes that are hard to counterfeit. This is really important in these times when cyber threats are growing. If you are interested, you can read more about it in the totp rfc. It explains how OCRA tokens work and why they are useful. I recommend considering them for your project, it can greatly improve your security!