Stellar Lumens, 7th largest cryptocurrency by marketcap, is reportedly looking at possibilities to buy a San Francisco-based startup building cryptographic ledgers for the finance industry, and is willing to pay $500 mln in XLM for the purchase. Chain was founded in 2014 and since then it has raised over $43 million in a series of funding rounds with some of the largest names in venture capital — including Khosla Ventures, RRE Ventures, Capital One, Visa, Citigroup, Nasdaq and Orange.