#StackBounty: #lightning-network #liquid How to emulate SIGHASH_NOINPUT using CHECKSIGFROMSTACKVERIFY?

Bounty: 50

I read on bitcoin-dev that CHECKSIGFROMSTACKVERIFY (CHECKDATASIG in BCash) can be used to emulate new sighash flags. How would that work, concretely? As an example, please provide an example update transaction based on figure 4 of the Eltoo paper, or aj’s simplified lightning (that doesn’t work with watchtowers).

Get this bounty!!!

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