deps: cashu-ts -> CDK

[kaloudis]

Description

Re-implementation of all of our Cashu ecash functionality, using CDK

This pull request is categorized as a:

• New feature
• Bug fix
• Code refactor
• Configuration change
• Locales update
• Quality assurance
• Other

Checklist

• I’ve run yarn run tsc and made sure my code compiles correctly
• I’ve run yarn run lint and made sure my code didn’t contain any problematic patterns
• I’ve run yarn run prettier and made sure my code is formatted correctly
• I’ve run yarn run test and made sure all of the tests pass

Testing

If you modified or added a utility file, did you add new unit tests?

• No, I’m a fool
• Yes
• N/A

I have tested this PR on the following platforms (please specify OS version and phone model/VM):

• Android
• iOS

I have tested this PR with the following types of nodes (please specify node version and API version where appropriate):

• Embedded LND
• LND (REST)
• LND (Lightning Node Connect)
• Core Lightning (CLNRest)
• Nostr Wallet Connect
• LndHub

Locales

• I’ve added new locale text that requires translations
• I’m aware that new translations should be made on the ZEUS Transfix page and not directly to this repo

Third Party Dependencies and Packages

• Contributors will need to run yarn after this PR is merged in
• 3rd party dependencies have been modified:
  • verify that package.json and yarn.lock have been properly updated
  • verify that dependencies are installed for both iOS and Android platforms

Other:

• Changes were made that require an update to the README
• Changes were made that require an update to onboarding

[gemini-code-assist]

Summary of Changes

Hello @kaloudis, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a major refactoring of the ecash functionality in the Zeus wallet by integrating the Cashu Development Kit (CDK). This change replaces the existing cashu-ts library with a more robust and efficient native implementation, enhancing the wallet's performance and reliability. The PR includes the necessary native modules for both Android and iOS, along with significant code refactoring to accommodate the new architecture.

Highlights

• CDK Integration: This PR integrates the Cashu Development Kit (CDK) to replace the existing cashu-ts library. This brings improved performance and reliability for ecash functionality.
• Native Module Implementation: A new React Native native module (CashuDevKitModule) is added for both Android (Kotlin) and iOS (Swift), providing a bridge to the CDK FFI bindings.
• Code Modernization: The codebase is refactored to use async/await for asynchronous operations, improving code readability and maintainability.
• Dependency Updates: The PR updates build configurations, dependencies, and library fetching scripts to include the CDK and its dependencies.

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[gemini-code-assist]

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[ajaysehwal]

@kaloudis, I think Cashu token locking isn’t working. In this screen recording, I locked the token to another Cashu wallet, but I’m still able to redeem it.

Screen.Recording.2026-01-28.at.12.59.29.PM.mov

[ajaysehwal]

Screen.Recording.2026-01-28.at.1.14.14.PM.mov

[ajaysehwal]

@kaloudis, I think Cashu token locking isn’t working. In this screen recording, I locked the token to another Cashu wallet, but I’m still able to redeem it.

Screen.Recording.2026-01-28.at.12.59.29.PM.mov

fixed in #3616