Bitcoin's script language is very restricted, claiming that Bitcoin has been doing "smart contracts" is disingenuous to me. I wouldn't call a bitcoin script as "smart". Ethereum was born because of this
Script is restricted, but it permits everything outlined by Nick Szabo's definition. As Wikipedia notes:
> Smart contracts were first proposed in the early 1990s by Nick Szabo, who coined the term, using it to refer to "a set of promises, specified in digital form, including protocols within which the parties perform on these promises".
