Bitcoin and ether stumble again following a wild week for global cryptocurrencies

Bitcoin vs. Ethereum
Alain Pitton/NurPhoto via Getty Images and Dado Ruvic/Reuters
Cryptocurrencies were off to a rocky start to the week on Sunday.
Bitcoin was down as much as 13% on Sunday, while ether was down about 15%.
A crypto sell-off last week wiped more than $400 billion from the nascent market in a single day.
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Global cryptocurrencies stumbled on Sunday following a roller coaster week in which the two main digital currencies, bitcoin and eth