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bip174: document PSBT 0 handling of type > 0xFD

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Sjors Provoost 2022-01-12 16:37:01 +01:00
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@ -819,6 +819,9 @@ If an updater is updating a PSBT and needs to add a field that is only available
New fields should first be proposed on the bitcoin-dev mailing list.
If a field requires significant description as to its usage, it should be accompanied by a separate BIP.
The field must be added to the field listing tables in the Specification section.
Although some PSBT version 0 implementations encode types as uint8_t rather than compact size,
it is still safe to add >0xFD fields to PSBT 0, because these old parsers ignore
unknown fields, and <keytype> is prefixed by its length.
===Procedure For New Versions===