[contract][zk-ticket] Implement ZKTicketContract entry points

[Xhristin3]

Severity

High

Files

contract/zk_ticket_contract/src/lib.rs

Description

All ZKTicketContract methods (issue_ticket, verify_ticket, use_ticket, get_ticket) are stubs returning Err(ZKTicketError::NotImplemented). No ZK proof verification is implemented, so the contract has no security guarantees beyond being a placeholder.

Acceptance Criteria

• issue_ticket takes a proof hash + event id, stores ZKTicket, emits an event
• verify_ticket re-derives the commitment and checks against stored proof_hash
• use_ticket marks is_used once and refuses reuse
• 404 for unknown ticket_id
• Test coverage for double-spend and invalid proof path

[MztaKing]

Dear Team, I would appreciate the opportunity to work on this issue.
Kind Regards

[Magrexy]

I want to resolve this issue please

[grantfox-oss]

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Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #504)
2. Your PR will be reviewed by the Gatheraa maintainers

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