I thought being a solution in search of problem was perhaps too charitable. Every joule we waste on hashes is another gram of carbon in the air. And it is all waste — the only problem cryptocoins solve better than other solutions is illicit transactions. It’s not even close to as anonymous as cash.

Coinage used to be more portable in the days of precious metal coins. But honestly I’ve had very little barriers in converting cash. It’s a solved problem.