As adoption accelerates, DID methods implemented on Distributed Ledger Technologies (DLTs) have gained prominence, each adopting distinct architectural and design strategies. However, rigorous cross-platform evaluations remain scarce. This study presents a comparative empirical analysis of three major DLT-based DID implementations: Ethereum (Ethr-DID), Hedera (HCS-DID), and XRP Ledger (XLS-40d).