My biggest issue with all the investment in blockchain-derived technologies that aren&#x27;t cryptocurrency related is that it&#x27;s hard to apply proof-of-work systems to real world problems. How do you incentivize people for mining blocks? How do you ensure you have enough distributed computing power, so that a single actor can&#x27;t take over the entire network? The company using a blockchain to track diamonds is a good example. Do I get diamonds for mining blocks? Then what&#x27;s the point? Companies like Everledger claiming to run a &quot;private blockchain&quot; are only using the word as marketing bullshit, because that effectively becomes a centralized database&#x2F;linked list.