Add SDK multi-signature transaction support

[Kingsman-99]

Overview

Add SDK multi-signature transaction support

Requirements

• Implement core functionality
• Add proper event handling
• Write comprehensive tests

Acceptance Criteria

• Feature implemented
• All tests pass
• TypeScript compiles with zero errors
• ESLint passes

Definition of Done

All CI checks must pass before the PR is reviewed.

[OmniZlatoon]

@OmniZlatoon has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Its < than a day now. Assign me now and see the results. Don't let the issue overdue kind sir KINGSMAN

ℹ️ Repo Maintainers: To accept this application, review their application or assign @OmniZlatoon to this issue.

[darkwalker2]

@darkwalker2 has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hi Maintainer, I have the necessary skillset to resolve this issue,I am a full stack developer I would really like to contribute on this project, as I clearly understand what is needed to be done.

Expect results in 1-3hour sir KINGSMAN-99

ℹ️ Repo Maintainers: To accept this application, review their application or assign @darkwalker2 to this issue.

[mkolade]

@mkolade has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hi I'm a full-stack developer and would love to resolve this issue, can you please assign this to me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mkolade to this issue.

[mercyJJ]

@mercyJJ has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

please assign

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mercyJJ to this issue.

[drips-wave]

Congratulations, @mercyJJ! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on September 30, 2026.

🧑‍💻 @mercyJJ: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊