Non-fungible tokens have captured the attention of artists and collectors alike -- with one digital art piece selling this week for nearly $70 million.
One congressman accused the Facebook CEO of "hiding behind the poorest people in the world."
House Democrats warned that, without oversight, the digital currency could quickly become "too big to fail.”
The digital currency, called Libra, is scheduled to launch in 2020 with partners including PayPal, Uber, Spotify, Visa and Mastercard.
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