Alekos Filini 881ca8d1e3
[signer] Add an option to explicitly allow using non-ALL sighashes
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
2021-05-26 10:38:15 +02:00
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