[bitcoin-dev] Proposed Extensions to BIP 174 for Future Extensibility

[Stepan Snigirev]

> why not use Bitcoin compact uint, which most PSBT consumers already
implement?

I totally agree with that, compact int parsing is already implemented in
all bitcoin applications, wallets and libraries. Also, for certain (mb
proprietary) applications I will be willing to use multi-byte keys where
the first byte defines the application type and next bytes define
application-specific fields.

I would suggest to set proprietary bytes to 0xF0-0xFC or to 0xE0-0xEF then
(E for Enterprise?).
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