The block in which the above post is included has a merkle root of e3f64b5cc7942d5a0e4d9e0639715c39669cffaf.
To find the winner we:

1. Convert the merkle root into base 10:
   e3f64b5cc7942d5a0e4d9e0639715c39669cffaf = 1301433453288558494978233409858312340125052108719.
2. Compute the residual after dividing by the number of tickets: 1301433453288558494978233409858312340125052108719 mod 798 = 713.
3. This is the winning ticket, held by @smjn.

Congratulations!