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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. 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. 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. 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=== ===Procedure For New Versions===