feat: BCUR2 wallet registration and address confirmation

[cc-unchained]

What kind of change does this PR introduce?

New feature to enable users to register wallets by scanning BCUR2-compatible QR codes and extends the QR code features to address confirmation flows.

Issue Number:

N/A

Snapshots/Videos:

If relevant, did you update the documentation?

Summary

This MR introduces BCUR2 support for wallet registration and address confirmation functionality. Below is the summary of the changes:

1. Enhanced BCUR2Encoder Component:
   • Added new prop instructions to allow customization of user instructions displayed with the QR codes in BCUR2Encoder.tsx.
   • Made default instructions part of the props for flexibility.
2. New RegisterBCUR2Button Component:
   • Added a new button for registering wallets via the BCUR2 protocol (RegisterWallet/RegisterBCUR2Button.tsx).
   • Implements interaction with the newly added BCUR2Encoder.
3. Integration of BCUR2 into Wallet Registration and Address Confirmation:
   • Updated Wallet/RegisterWallet.jsx to include the new RegisterBCUR2Button.
   • Incorporated BCUR2Encoder for address confirmation based on QR codes in Slices/ConfirmAddress.jsx.
4. Enhancements to RegisterWallet Module:
   • Included the BCUR2 button within RegisterWallet/index.jsx.

Does this PR introduce a breaking change?
No.

Checklist

• I have tested my changes thoroughly.
• I have added or updated tests to cover my changes (if applicable).
• I have verified that test coverage meets or exceeds 95% (if applicable).
• I have run the test suite locally, and all tests pass.
• I have written tests for all new changes/features
• I have followed the project's coding style and conventions.
• I have created a changeset to document my changes (npm run changeset)

Other information

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For information on creating and using changesets, please refer to our documentation on changesets.

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Project	Deployment	Actions	Updated (UTC)
caravan-coordinator	Ready	Preview, Comment	Feb 21, 2026 6:41am

[bucko13]

Confirmed address verification menu includes BCUR2

Style nit here: I think we could center this a bit

Missing:

• The test suite should include registration (i think the suite has them as wallet policy verification) and address verification for bcur2
• Address verification should have a wallet verification step as well so that a device like seed signer especially won't have to exit out of the flow and find the verification. this can be done as multi-steps in the modal or with tabs that can be switched through.

[bucko13]

Couple additional comments but thanks for putting this together!

[bucko13]

to keep the code easier to follow, i think it would be good to adapt (pun somewhat intended?) caravan-wallets to accept BCUR2 as the keystore for this as well and return the same thing. Two different keystores can have the same interaction under the hood, but adding that makes it easier to connect menus for example and just select the keystore enum with the interactions without having to convert

[jbrauck-unchained]

Wow this worked so slick on my passport my goodness
ACCEPTANCE TESTED!

[bucko13]

Code looks good! Just going to run through some acceptance testing and I think we can merge in.

[bucko13]

Code looks good. Test suite looks good. Tested the registration first before the address which works. One last UX nit is that I think the confirm address modal should show the address on screen in the modal. Currently you have to close the modal before you actually verify.