Bitcoin is a “product” like the web and it’s existed for a decade. Blockchain is just hashing, infrastructure that’s already existed for decades. Nobody has found a good use for either yet. They may. But that doesn’t mean any particular cryptocurrency should have any value. Or that we should particularly value the blockchain yet.

The reason nobody has found a good use for block chain yet is that the only time it offers any benefits over a traditional relational data store is when you cannot trust anybody. The truth is you can trust someone almost all the time. And even if you can’t really, it might be more efficient to just pretend. The truth is that trust is a substantial optimization and it eliminates vast quantities of waste and inefficiency in the proof of work model. That’s why people don’t want blockchains.

A really clean way of expressing this idea is that when you deposit a paper check at the bank they don’t check the signature. They don’t check the signature because they trust you, or rather it’s more efficient to just assume the money is being deposited legitimately. The amount of effort signature verification takes makes it more expensive than just eating the fraud losses. The same is true in many of these block chain powered proof of work situations. The cost of computing the proof of work outweighs the cost of managing fraud. Not to mention all the ridiculous fraud perpetrated on this unregulated market but that’s neither here nor there.