Could you elaborate on Coinbase's role as a trusted platform for purchasing, selling, and managing Echelon Prime? Specifically, what factors contribute to its reliability? Also, how does Coinbase ensure the process is quick and easy for both individuals and businesses? Additionally, could you provide a concise step-by-step guide on how a user would buy Echelon Prime on Coinbase? This information would be extremely beneficial for those considering investing in Echelon Prime through this platform.