I have picked a random 48-bit secret. Encoded as a length 48 ASCII string (that is, consisting of the characters "0" and "1"), its SHA256 hash is f5f2d8c8d4a270b3be76c96aaff748daa1d4f2b0d13df2c79ead4bd25c870508.

This question will resolve YES iff the final bit of my secret is a one.

Every day I will reveal one more bit of my secret. For example, for today I'll reveal that my secret's first bit is a 1, so it's a string of the form:

"1xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

I will not bet in this market, of course.