Detail of signed bitcoin transaction QR is not displayed on the app before broadcast.

[Transisto]

It's also nor a format compatible with anything else that could parse it in a human readable format.

There is no possible verification of what data is coming out of the vault QR code. IMO this is worst than a having it communicate over bluetooth or USB.

[aaronisme]

I think you are using out the companion app? I think we should provide some tool to help to decode the QR code. it just using our encoding method(https://github.com/CoboVault/crypto-coin-message-protocol) to encode data into the QR codes.(using bc-ur) and if you are using our btc-only firmware. the signed data are just psbt, you can use other library or tool to do the verification.