FILE PHOTO: A bitcoin is seen in an illustration picture taken at La Maison du Bitcoin in Paris, France, June 23, 2017. REUTERS/Benoit Tessier
(Reuters) - It's next-level stuff.
"Layer 2" cryptocurrencies native to projects built on top of "layer 1" blockchains such as Bitcoin and Ethereum - have found a new lease of life after a year in the doldrums, buoyed by a rising crypto tide.
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