[Backend] backend/src/validators/user.validator.ts does not validate publicKey format before it reaches the controller

[grantfox-oss]

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Why this matters

backend/src/validators/user.validator.ts presumably validates request bodies for user-related routes, but if it doesn't check that a publicKey field matches the Stellar G... (56-char, base32) format before hitting the controller/repository layer, malformed keys propagate deeper into the stack where they fail with less clear errors (or worse, get silently stored).

Acceptance criteria

• Add a Stellar public key format check (regex or SDK's StrKey.isValidEd25519PublicKey) to the relevant schema
• Return a clear 400 with a descriptive message on failure
• Add a test with a malformed key

Files to touch

• backend/src/validators/user.validator.ts

Out of scope

• Validating publicKey elsewhere in the codebase (tracked separately for other controllers)
• Adding key checksum verification beyond format

[adeboladee]

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Hello Maintainer, Please I would like to work on this issue

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[baedboibidex-cmyk]

@baedboibidex-cmyk has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

pls assign me

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[Peolite001]

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Hi, I would love to work on this issue

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[Fury03]

@Fury03 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

i can work on this

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[abimbolaalabi]

@abimbolaalabi has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Please assign this to me Thanks!

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[muhsar27]

@muhsar27 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Please assign this issue to me i would love to work on this

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[drips-wave]

Congratulations, @Fury03! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @Fury03: 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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