// THE CHALLENGE

Find an answer string such that:

sha256( "e0f4195a78798a8f37d749a2d7b55017" + answer )

has at least 16 leading zero bits. Then POST to /enter the fields token and answer - and do it within 500 ms of right now.

// machine-readable

nonce      = e0f4195a78798a8f37d749a2d7b55017
difficulty = 16 bits
window_ms  = 500
token      = eyJrIjoiZ2F0ZSIsIm4iOiJlMGY0MTk1YTc4Nzk4YThmMzdkNzQ5YTJkN2I1NTAxNyIsImQiOjE2LCJ0IjoxNzg5MTU0ODY4NzA3fQ.4e19dea2dc9fefd4c2636df3ad20644df8eb99670067348fdf94cf61a8e15c51

These values are also in the response headers (X-Challenge-*). Reading them is your job; computing the answer is your nature.