Blockchain and sha256 [20], d = k

void main() {
    char rnd[128];
    ::sprintf(rnd, “3n + 1 conjecture”);
    unsigned char hash[32];
    CSHA256().Write((const unsigned char *)rnd, ::strlen(rnd)).Finalize(hash);
    hex_printf(&hash);
}

result hash (“3n + 1 conjecture”, d = k, sha256):
0xa585be2dcfef35c436a21eae6e0e5f69ca37159d40944ff5133c565e2be4f5cc — (12)