. Add `GET /api/v1/rewards/transactions` endpoint

[DeFiVC]

What: Add an endpoint that returns all reward-related blockchain transactions for the user, with on-chain verification status.

Why: Users want to verify their reward transactions on-chain. Currently the API only returns the tx hash, not the verification status.

Scope: Create endpoint that queries quizSubmissions with txHash, verifies each transaction on Stellar Horizon, and returns verification status (confirmed/pending/failed).

Acceptance criteria:

• Returns all reward transactions with verification status
• Status is verified against Stellar Horizon
• Cached for 30s
• Includes block height and confirmation count

Technical context: src/stellar/client.ts — Horizon queries. src/modules/rewards/reward.service.ts — reward operations.

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[Komelove]

@Komelove has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I’d be happy to take this issue. I’ve looked through the requirements and have a plan for approaching the implementation. I’ll investigate the existing code and dependencies, make the required changes, verify the behaviour with tests, and provide a concise PR explaining what was changed. I can start immediately and will communicate any blockers during development.

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

[believetimothy]

@believetimothy has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello Maintainer, I can fix this issue.
Please assign me.

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[codebestia]

@codebestia has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello Maintainer
I can work on this.

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[haddy65]

@haddy65 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I will like to work on this issue. please assign to me.

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[drips-wave]

Congratulations, @codebestia! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @codebestia: 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.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@codebestia's PR #456 was approved and merged by @DeFiVC.

🏆 @codebestia: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (509 total points). Track your full progress on GrantFox.

👏 Great work, @codebestia! Keep contributing to ChainLearnOfficial.