Instead of blindly using the `sighash_type` set in a psbt input, we now only sign `SIGHASH_ALL` inputs by default, and require the user to explicitly opt-in to using other sighashes if they desire to do so. Fixes #350
Instead of blindly using the `sighash_type` set in a psbt input, we now only sign `SIGHASH_ALL` inputs by default, and require the user to explicitly opt-in to using other sighashes if they desire to do so. Fixes #350