Coin flip

How to use it

Step 1

Agree with the other person on who takes which side before flipping.

Step 2

Press flip. The coin spins on screen and lands on heads or tails.

Step 3

Send the result link if anyone wants to check the flip later.

What makes the draw verifiable

A pocket coin is hard to prove: nobody can see the toss from afar. Here the side comes from a seed generated on the server. The algorithm reads one number derived from that seed: an even value means heads, an odd value means tails. Since the method is public, anyone can reproduce the result.

The result link stores the seed and the algorithm version. To check it, use the verification and see that the same seed always gives the same side. No flipping again until you get the side you wanted.