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best crypto signals app thinks that cryptocurrency will certainly involve a poor ending. In October 2017, BlackRock CEO Laurence D. crypto signal groups called bitcoin an 'index of cash laundering'. " Bitcoin just shows you just how much demand for cash laundering there is in the world," he said. Cryptocurrencies have been compared to Ponzi systems, pyramid schemes and financial bubbles, such as real estate market bubbles. The New Yorker has described the discussion based on interviews with blockchain creators in a write-up regarding the "debate over whether Bitcoin, Ethereum, and also the blockchain are transforming the world".