https://thenextweb.com/hardfork/2018/01/09/telegram-ico-white-paper-leak/
I expected their ICO would be going on EOS but if this whitepaper is real, it would not be going that way.
Because their plan for ICO is 2018 1Q as EOS mainnet will be open 2018 3Q or 4Q.
Telegram is going to run their own blockchain, TON(Telegram Open Network).
It could be built based on EOS.