Input-triggered transaction expiry

The discussion involves two specific symmetry constructions that are notable for requiring transaction expiry. One of these was previously connected to an idea that has since been removed, leading to some uncertainty about its validity. The necessity to further contemplate alternative suggestions indicates a process of evaluation and decision-making regarding these symmetry constructions. This reflection on alternatives underscores the importance of thorough analysis in determining the most effective construction methods that incorporate transaction expiry effectively.