Hmm? No, the average user uses a hardware wallet and corresponding software control wallet which implements such a protocol completely transparently to them.
Most people today are using Sparrow with HWW of choice via PSBT (air-gapped or usb). Maybe specter after that…
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Okay? Add an extension to the PSBT with requested nonce. This is really trivial stuff.
Agreed and we have suggested adding as a new field 🤝
