JPMorgan casts significant doubt on the SEC approving additional cryptocurrency ETFs beyond Ethereum (CRYPTO: ETH), due to concerns over the classification of most cryptocurrencies as securities. What Happened: JPMorgan’s managing director and global market strategist Nikolaos Panigirtzoglou expressed skepticism regarding the SEC’s willingness to approve ETFs for cryptocurrencies like Solana (CRYPTO: SOL), The Block reported. He said the SEC’s decision to approve Ethereum ETFs was already a stretch due to ongoing ambiguity about Ethereum’s classification as a security. His comments come in the…