What word describes the process by which a corporate trustee certifies that securities have been validly issued according to the terms of an indenture?

The correct term for the process by which a corporate trustee certifies that securities have been validly issued according to the terms of an indenture is authentication. This process involves confirming that the issuance of the securities adheres to the specifications laid out in the indenture, ensuring compliance and legitimacy.

Authentication plays a critical role in the issuance of securities because it provides assurance to investors and other stakeholders that the securities are valid and that all necessary procedures have been followed. This helps to maintain trust in the financial markets, as it reduces the risk of fraud and misrepresentation.

While reconciliation is focused on comparing records to ensure they match, and verification generally pertains to confirming the accuracy of data rather than the specific issuance process, authentication directly addresses the certification aspect within the context of an indenture. Thus, the use of the term authentication accurately captures the essence of the trustee's role in securities issuance.