The CEOs of leading crypto exchanges Coinbase and Gemini believe that Bitcoin is the only digital asset that qualifies as a U.S. reserve asset.Gemini co-founder Tyler Winklevoss argues that a reserve asset must be "hard money" with a proven store-of-value status, similar to gold.Coinbase CEO Brian Armstrong emphasizes Bitcoin's simplicity and reputation as "a clear successor to gold."Cardano and Ripple executives defend the inclusion of their tokens in Trump's proposed Crypto Strategic Reserve.