By Rae Wee and Vidya Ranganathan SINGAPORE/LONDON (Reuters) -Bitcoin dropped to a seven-month low on Friday, closing in on the $80,000 level below which some analysts say much heavier losses are likely for the world's largest cryptocurrency. Bitcoin fell to $80,553, and ether hit a four-month low, as cryptocurrencies led a broad flight from riskier assets, spurred by investor worries over lofty tech valuations and uncertainty over near-term U.S. interest rate cuts. Cryptocurrencies are often viewed as a barometer of risk appetite and their slide highlights how fragile the mood in markets has turned in recent days, with high-flying artificial intelligence stocks tumbling and volatility spiking. Bitcoin is down 12% for the week. Its slide follows a stellar run this year that propelled it to

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