This link should answer your questions: Recipe: How to Make Your Coffee Bulletproof...And Your Morning Too | The Bulletproof Executive
hot coffee + butter = liquid.
Blender should not matter. Anything that helps incorporate the butter into the coffee and makes a frothy head seems to fit the description.
MCT is listed as optional. Perhaps the site can tell you what the point of it is.
Grass fed butter is important according to the link. It explains why. Wal-mart butter =/= grass fed.
"I need large pieces of dead cow to be happy." - skink531
"You truly are delusional and other forms of insanity apply go you. You aren't even interesting." - oceangrl