Revise POST /commit endpoint interface

[errfrom]

Why

Currently POST /commit endpoint accepts utxos with witnesses as request payload and supports spending from script addresses. However, it does not provide any means to tweak transaction context, making it impractical for many real-world cases that often involve checking transaction validity range, required signers, etc. as part of the validator logic.

What

No response

How

No response

[ch1bo]

This is a very good point! The UTxOWithWitnesses is a very ad-hoc type we chose and internally allows the hydra-node to spend from a script, iff all that is needed is a redeemer and the script witness.

@errfrom Do you have an open source validator that should be committable into a Hydra head?

[errfrom]

@ch1bo Yes, there is a simple sub-validator in hydra-auction used to check
the spending conditions for moving a standing bid to L2:

https://github.com/mlabs-haskell/hydra-auction-onchain/blob/95fae061a4a50a635007a7e228443080f8141570/src/HydraAuctionOnchain/Validators/StandingBid.hs#L139-L157

[ch1bo]

That's perfect, thanks.

[ch1bo]

Converted to feature #1350