Shpoop - a couple of ideas:
1. he can ask someone who isn't blind (cheat's method
)
2. he can use his fingers to spot the head vs tail by touch alone (overly-sensitive method, and I guess you'll tell me the coins are blanks)
3. make
4 piles. 3 have only one coin in, 1 has all the others. He now has at least 2 piles with the same number of white side up coins (as at least 2 of the 3 with only one coin will be the same) (foolproof, wasteful method
)