The bet outcome is calculated by hashing today's secret with your Transaction ID.
You can check on your own by using the code and a past secret published here.

import hashlib
import struct
def verify(txid,secret,lessthan):
   sha512 = hashlib.sha512()
   sha512.update(secret+txid)
   b = long(sha512.hexdigest(),16)
   result = b % 65537
   if result<lessthan:
      print "win!"
   else:
      print "lose!"

Past Secrets

current time: Sun, 25 Jan 2015 01:52:13 +0000

Date Secret
January 24 2015 2ab05e1600cd61c001708053282ace87
January 23 2015 25b7403afa5814f452879eb51200a043
January 22 2015 2a736db0cfa8ba524bbca9a8f66d4cb2
January 21 2015 91a91a92dee70693926cd3f299a1ea03
January 20 2015 4e7ec17ade32463b7055fc69a2aa780b
January 19 2015 be7d1123bb3b58dc5fb89ce5b960df74
January 18 2015 347e14e5d4748958516a5d2e6dcca7a3
January 17 2015 c4859a8ca2e90f3db8d86d3afb115c57
January 16 2015 f5743727b9801a4ce94fef5c46a41458
January 15 2015 9da4839f265b3fb309b9a711b671b0e4
January 14 2015 8ed2d287db94ea21a2432e8e4f2f32ab
January 13 2015 b669ba787d737ead94c18cb2f692c433
January 12 2015 9455d7f87e25f6939e3509836bcaf8c6
January 11 2015 c7af49ab23cf713ddd780e6d71bb6e9b