It might be a Thin Blue Line frame made in Canada.
Thin Blue Line was a line of bicycles available in the 1990s from a shop in Toronto called Silent Sports. I have seen three of their frames with an identical canti bridge, one of which was made with a fluted Tange Prestige Ultimate downtube. It's probably a very good frame, but it's probably not a KONA Explosif.
The chainstay looks badly mauled. Ouch!