## Summary

<!-- What does this PR change and why? -->

## Related issue

<!-- Closes #... (if applicable) -->

## Type of change

- [ ] Bug fix
- [ ] New feature
- [ ] Refactor / cleanup
- [ ] Documentation
- [ ] Build / CI

## Testing

<!-- How was this verified? e.g. `dotnet test`, manual run on Windows/Linux/Android, golden-vector comparison -->

## Checklist

- [ ] `dotnet test` passes
- [ ] No seed/private key material logged or persisted in plaintext (if touching Crypto/Wallet/Storage)
- [ ] Server responses still validated with Merkle + checkpoints (if touching Spv/Net)
- [ ] Code/comments/commit messages are in English
