Chain is a technology company that partners with financial firms to build and deploy blockchain networks that transform markets. Chain develops and maintains the Chain Open Standard, an open source blockchain protocol for high-scale financial applications. Chain's platform includes Chain Core and Chain Sandbox. Chain has raised $45 million from venture capital firms and strategic investors. Its board of directors includes the former chief executive officer of American Express and a founding executive of PayPal. Chain is headquartered in San Francisco, California.