The block in which the above post is included has a merkle root of e62015b43325b5d7a70f25b0ccba1d3edb0df094.
To find the winner we:

1. Convert the merkle root into base 10:
   e62015b43325b5d7a70f25b0ccba1d3edb0df094 = 1313783391812653114218947245563506074197030727828.
2. Compute the residual after dividing by the number of tickets: 1313783391812653114218947245563506074197030727828 mod 343 = 335.
3. This is the winning ticket, held by @rufusfirefly.

Congratulations!