proof coin

10 LETTERS · STARTS WITH P

proof coin is a valid 10-letter word worth 16 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3R1O1O1F4C3O1I1N1

3 + 1 + 1 + 1 + 4 + 0 + 3 + 1 + 1 + 1 =16 PTS

DOUBLE WORD → 32TRIPLE WORD → 48

MEANING

What does proof coin mean?