By Gertrude Chavez-Dreyfuss, Tom Wilson and Tom Westbrook NEW YORK/LONDON/SINGAPORE (Reuters) -Cryptocurrency ethereum climbed to a new peak for a third straight day on Monday on continued optimism about further growth in decentralized finance or “DeFi”, although some analysts said it was overvalued at current levels. Ethereum has soared this year, fuelled by the boom in DeFi, which are platforms that facilitate crypto-denominated lending outside traditional banking. Many DeFi applications are embedded in the ethereum blockchain. Ethereum, the second-largest coin by market capitalization, hit …

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