Ask HN: What are some concrete examples of companies blockchains make possible?

Storj maybe?

PS: 10 hours in, this question was still unanswered. I know it's the weekend, but my first thought was: Common wisdom seems to think there is no concrete example.

Here are some answers, If by companies you mean industries. That is, a type of company that only exist if blockchain exists.

Because cryptocurrency exists because of blockchain, then bitcoin Mining and Ether mining companies exist due to blockchain.

ICO marketing and engineering.

Bunch of software sweat shops I know offer ICO launch services including white paper writing, app/client development and a complete marketing and shill package