The Bithumb exchange and its American fintech partner seriesOne Wednesday held a meetup event with 50 VIPs in Seoul. The gathering came after the two companies have formed a joint venture last November to open a crypto exchange in the United States.

The gathering featured the security token offering (STO) the two companies plan to arrange in the United States.

Crypto tokens are marketable securities because they are subject to U.S. securities and regulations. Their value came from an external tradable asset.

Executives of the two American companies, including Helena Oil & Gas, also participated in the meeting.

The two firms plan to issue a security token offering. Game developer Planet Digital Partners has also been pushing for the STO, to share profits with investors.

The seriesOne has received a formal license from the U.S. Securities & Exchange Commission and the Financial Industry Regulatory Authority.

American financiers established the seriesOne in 2013.

It has been dealing with crowdfunding, blockchain and security token exchange services.

seriesOne CEO Michael Mildenberg said the company, together with Bithumb, would create a platform, which would enable the issuance and trading of security tokens.