otter browser_ blink or webkit based?

i am bit confused by engines of it after reading on wikipedia [ 1 ]. there are only few commits related to webkit [ 2 ]. i am wondering which engine is most supported by otter browser. if both of them are supprted equally, how do i switch them?

[ 1 ] https://en.wikipedia.org/wiki/Otter_Browser [ 2 ] https://github.com/OtterBrowser/otter-browser/blob/HEAD/CHANGELOG