Crypto?

If this discussion has occurred, forgive and ignore. What are Crypto stamps and their theory? I recently saw a dealer sell Austrian crypto stamps and another selling what appeared to be a sheet of label remnants from Austria, claiming to be First issue. Are they a charge for email within the country of issue? Are they covered under the UPU?. Does one need a virtual album and how does one soak off a used crypto stamp? I guess you buy them with crypto currency.
In this Brave New Virtual World this small bit of wet-ware is feeling overwhelmed!
I throw this out for comment and discussion.

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