The WeightedSigners struct includes a nonce field, which is typically used to prevent replay attacks. However, upon inspection of the whole, this nonce is never actually checked or updated when validating proofs or signatures.
The lack of nonce usage in the validation process potentially allows for replay attacks. An attacker could potentially reuse valid proofs or signatures multiple times, leading to unauthorized actions or double-spending issues.
Implement a nonce checking mechanism in the proof/signature validation process. Each time a proof is used, the nonce should be incremented.
