[Storage] Create Signature Replay Protection Storage

[Eniola3321]

Persist signature hashes to prevent replay attacks.

Acceptance Criteria
Store signature hash
Check duplicates

[Jo-anny]

@Jo-anny has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, I would love to work on this issue.

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[frank0277]

@frank0277 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer I would like to work on this

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[karagozemin]

@karagozemin has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I’d like to take this on. Preventing signature replay is essential for maintaining transaction integrity and protecting the contract from duplicate execution.

I can design an efficient replay protection mechanism, enforce duplicate detection before processing, and add focused tests to verify both accepted and rejected signature flows.

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

[Escolabs001]

@musa01cyb has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer, trust me i would like to work on these issue

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[Ebenezer199914]

@Ebenezer199914 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

can i work on this issue

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[kingksjo]

@kingksjo has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I would like to work on this

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[drips-wave]

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

🧑‍💻 @kingksjo: 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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