Whether Ethereum is useful, and indeed groundbreaking, is best evaluated in the same terms as other network protocols. It’s been so long since Ted Nelson coined the term hypertext in 1965, with his Xanadu project, that it’s easy to forget why people liked HTTP and its sibling, HTML. It had exactly one method, GET, which would request a page from a web server. The only acceptable response was an HTML page.1
In many respects, the Ethereum network today is in ...