$1.6 billion Coinbase just made a big move toward supporting a bunch of Ethereum-based cryptocurrenc

Coinbase, the $1.6 billion cryptocurrency exchange that took bitcoin mainstream, will add support for ERC20 tokens. ERC20 is the technical standard behind Ethereum blockchain tokens, which make up the majority of so-called altcoins — alternative tokens that might be embraced by cryptocurrency enthusiasts, but that generally aren't in the mainstream.  Coinbase hasn't said which of the hundreds of ERC20 tokens it will trade on its platform, if any. But it plans to start the months-long process...