The trustee performs numerous functions depending on the type, structure, and features of the bond. These functions include acting as a paying agent, registrar, monitor, collateral agent, and representative. As a paying agent, the trustee collects the interest and principal payments from the issuer and distributes them to the bondholders on the due dates. As a registrar, the trustee maintains records of bondholders and their ownership, transfers, and conversions of the bonds. As a monitor, they observe the issuer's compliance with covenants to protect bondholders' interests. If there are any breaches or defaults, they report these to the bondholders and take remedial actions if needed. The trustee also holds collateral or security that backs the bond and ensures that they are valid and sufficient. In addition, they represent the bondholders in negotiations or lawsuits involving the issuer and may initiate legal actions to recover their claims or damages.