[Transfers] Validate Frozen Token Status

[Eniola3321]

Description

Prevent ownership transfers for NFTs that have been frozen.

Acceptance Criteria
Check frozen state
Reject transfers
Add tests

Labels

contract
security
transfer

[6akola]

@6akola has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Please, assign me this issue.

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[unajiogenyi05-hub]

@unajiogenyi05-hub has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello, I am interested in resolving this task. I have analyzed the requirements and mapped out an efficient path forward for execution. Please assign the issue to me if it is still open, and I will get started right away.

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[idrisososanwo]

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

Hi maintainer, I would like to work on this issue

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[Jumongweb]

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

Hi maintainer, i will like to solve this issue

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[elcabasa]

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

Hi Maintainers,

I'd like to work on #767 – [Transfers] Validate Frozen Token Status.

I have experience contributing to Rust and Soroban smart contracts, particularly around transfer validation, contract security, and unit testing. I'd be happy to implement this safeguard to ensure frozen NFTs cannot be transferred until they are unfrozen.

My plan is to:

Review the current NFT transfer flow to identify where the token's frozen status is stored and checked.
Implement a validation step that verifies whether the NFT is currently frozen before executing any ownership transfer.
Reject transfer attempts for frozen NFTs using the project's existing error-handling conventions (or introduce an appropriate custom error if needed).
Ensure the validation integrates cleanly with the existing transfer logic without affecting transfers of unfrozen NFTs.
Add comprehensive unit tests covering:
Successful transfer of an unfrozen NFT.
Rejection of transfers when the NFT is frozen.
Verification that the expected error is returned for frozen tokens.
Relevant edge cases, such as freeze/unfreeze state transitions if supported by the contract.
Run the project's quality checks (cargo fmt, cargo clippy, and cargo test) to ensure formatting, linting, and all tests pass before submitting the PR.

I'll keep the implementation focused, follow the repository's coding standards and contribution guidelines, and submit a clean, reviewer-friendly PR that includes Closes #767, along with the relevant test results demonstrating that all acceptance criteria have been met.

I'd appreciate being assigned to this issue. Thank you!

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

[Naomi-Gift]

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

Can I please work on this

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[drips-wave]

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

🧑‍💻 @Naomi-Gift: 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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