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To whom it may concern:

I taught the Programming Blockchain Seminar in Miami, FL on June 1-2, 2021 to Alexander (Sasha) Klein <sashafklein@gmail.com>.

The student attended and finished the seminar to my satisfaction.
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You can find the public key for this message at: http://pgp.mit.edu/pks/lookup?op=get&search=0xFAA617E32679E455
This message can be seen online at http://programmingblockchain.com/certificates/1d68f11829fd44d44294.txt