How can I change the sighash from a tx? Im not a coder, but I like to learn... I was watching the last Bitcoin Theory and I wonder if there is a easy tool to construct sighash_single sighash_anyonecanpay and a way to include later more inputs... I use electrum to make my raw tx, but I think this is a little more complex... anyone can teach me about it or link some good content? I would really appreciate it.