Standardize v0 witness outputs of any length #29571

1. 
   TheBlueMatt commented at 10:27 pm on March 5, 2024: contributor

   Please describe the feature you’d like to see added.

   Currently any length any-version witness outputs are standard except v0 witness outputs of unknown length. This is fine, I guess, except its a bit confusing and easy to mis-implement in two-party protocols that wish to ensure the transactions they generate are standard. Is there a difference in v0 unknown-length inputs that merits them being nonstandard or should they simply be made standard?

   Is your feature related to a problem, if so please describe it.

   No response

   Describe the solution you’d like

   No response

   Describe any alternatives you’ve considered

   No response

   Please leave any additional context

   No response

2. TheBlueMatt added the label Feature on Mar 5, 2024
3. 
   sipa commented at 10:37 pm on March 5, 2024: member

   Witness v0 outputs with length other than 20 or 32 are consensus-unspendable (unfortunately). Is that a good enough reason?

   BIP141:

   If the version byte is 0, but the witness program is neither 20 nor 32 bytes, the script must fail.

4. TheBlueMatt closed this on Mar 7, 2024

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5. 
   TheBlueMatt commented at 5:07 pm on March 7, 2024: contributor

   Does that mean it should follow the OP_RETURN length limit? :trollface:

Contributors
TheBlueMatt sipa

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Feature