About Qtum:
Currency, which connects properties bitcoin and ethereum. Co-founders are from China – Patrick Dai and Jordan Earls in 2016. Main aspect was to connect the transaction model UTXO from Bitcoin with Ethereum, who allows creating advanced smart contacts. Block time of the Qtum is 120 seconds. On 7 January 2018, Qtum had its own ATH (All-Time High price), which was equal to $99.87..

Resources:
Official website: https://qtum.org/en
Whitepaper: https://github.com/qtumproject/qtum/
Source Code: https://qtum.org/uploads/files/a2772efe4dc8ed1100319c6480195fb1.pdf