OSTKO, the Digital Voting Series A-1 Preferred Stock, will replace its predecessor Blockchain Voting Series A Preferred Stock – OSTKP
Source: https://www.coindesk.com/tzero-launches-second-digital-security-to-trade-on-pro-securities-ats
tZERO Launches Second Digital Security to Trade on PRO Securities ATS
June 28, 2019
CoinDesk
