What do you mean by "legit"?
Discussion
An IOU-BTC with trust-minimised assumptions (not trustless).
Sergio Damian Lerner is a recognised BTC contributor and the founder of the Rootstock project.
On Rootstock, you can do what you can do on Ethereum and other VM chains. It's possible to run Tornado Cash there.
There are other excellent projects there, such as Dollar on Chain.