Source: Cointelegraph.com NewsBitcoin sunk to under $50,000 at the start of US trading on Aug. 5, prompting a huge spike in trading volumes of crypto-related ETFs.Read MoreBitcoin ETFs, Ethereum ETFs, crypto market volume, Bitcoin trading volume, Ethereum trading volume, BlackRock Bitcoin Trust, Grayscale Ethereum Trust, crypto market crash, CoinGlass