The block in which the above post is included has a merkle root of 1cd3cbdcac2d2d42362c0e8e33cfeeb55bbebd95.
To find the winner we:

1. Convert the merkle root into base 10:
   1cd3cbdcac2d2d42362c0e8e33cfeeb55bbebd95 = 164574957704984124685819231379956515290715438485.
2. Compute the residual after dividing by the number of tickets: 164574957704984124685819231379956515290715438485 mod 647 = 339.
3. This is the winning ticket, held by @krnel.

Congratulations!