Any integer x over GF(p) have a modular inverse x^-1 so that x * x^-1 = 1. So the view private key v = H(S || “magic number”) * s (where s is your nsec, and S = sG = npub) can be reversed, by testing each possible S’, and if it holds, then it is the view key for S’: S’ = H(S’ || “magic number)^-1 * v * G = H^-1 * H * s * G = sG = S Then you can trivially reverse the key s = H(S || “magic number”)^-1 * v