What’s the rational for including the version bytes in the xpub in the GLOBAL_XPUB field? This was briefly touched upon in an earlier email from Stepan, but I don’t think it was every fully addressed.
I am not sure if we need the whole xpub or keeping chain_code and > public_key is enough, but I would suggest to keep other data > just in case. For example, keeping prefix that defines if the key is used > for testnet or mainnet may be useful. > The version bytes seem to be superfluous data considering the transaction format and the rest of the PSBT key-values are network agnostic. If we wanted to attach network data to the PSBT then I think that would be better served by using a new key. There is also a potential issue where we could have conflicting versions on different xpubs in the PSBT. If we remove the version bytes then we can eliminate this possibility. I haven’t formed an opinion on whether or not the other data outside of the public key and chain code should be included, but I think it would be good to discuss any rational for either including it or omitting it.
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