for (i = 16; i < 64; i++) W[i] = SIG1(W[i-2]) + W[i-7] + SIG0(W[i-15]) + W[i-16];
# Mine with small nonce range for demo nonce = miner.mine(dummy_header, easy_target, start_nonce=0, nonce_range=1000000, work_size=65536) sha256 gpu miner
for (i = 0; i < 16; i++) W[i] = data[i]; for (i = 16; i < 64; i++)