For the past year and a half, a Silicon Valley startup has quietly convinced some of the biggest names in venture capital to back its effort to turn the technology behind bitcoin into a mass-marketed phenomenon.
Now, that company, which bears the name 21 Inc., is emerging from stealth to announce it has raised $116 million in venture funding, the most ever by a startup in the digital-currency sector, based on data from bitcoin news service Coindesk.
