SINGAPORE, Nov. 19, 2020 /PRNewswire/ -- Qtum, an open-source blockchain project that leverages proof-of-stake (POS) consensus and different virtual machines to power business-friendly smart contracts, has just moved one step closer to realizing its decentralized finance (DeFi) ambitions, with the completion of the QiSwap testnet phase. QiSwap is a decentralized...