I like your podcast, but man, you are hella stuborn. You see, if you were a random person, I would not care. But you are speaking to a decent public audience, so I think it is apropriate to call you out when you are wrong. The main point is, that bitcoin ASIC miner calculates SHA256. It takes a block, and hashes it, each time with a different nonce, until it finds a hash lower than a certain number (according to difficulty) - that is SHA256 hash with many leading zeros. This is how proof of work is done. You do not have to trust me. You can go look it up.