You ARE a communications genius. I finally understood the concept of hash, with the help of Alice and Bob.
And now the nonces as well, and the concept of proof-of-work. And, thus, the concept of mining (which sounded quite absurd to me in the beginning I must confess).
But apparently you did not define private and public keys. I still have a gap there.
And now, a lot of light has been shed on smart contracts, as well!
You´ve been of great help. Thanks, indeed. You have achieved the miracle of making things clearer to this oldtimer, accountant, non programmer.