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Even that poses a fun test. What flipping method is needed to ensure some level of randomness.

I love that idea of a grifter being able to flip a coin as they choose.

Maybe letting the coin fall on a hard surface, so that it has a chance to bounce/spin randomly before falling flat (or staying on its side!)

Probably a device that would uniformly toss the coin with regards to force applied at X number of different strengths.

Or have both people flip a coin secretly, then reveal the coins and XOR the results :D