The World’s Biggest Crypto Company Just Opened the Books for Its IPO (Bloomberg) If the word “Bitmain” isn’t aready synonymous in your head with “Bitcoin,” it’s time that it is. The China-based company makes the bulk of the ASIC mining machines that mine Bitcoin and other cryptocurrencies. And mining groups controlled by Bitmain oftentimes control more than half of all of Bitcoin’s network hashrate. It turns out mining all that crypto is equivalent to mining fiat. Bitmain, which on Wednesday filed to go public in Hong Kong, had a $742.7 million profit on $2.8 billion in revenue in the first half of 2018. Its return on equity is close to…