twenty percent premine ?

Yes, consider that Webchain didnt have any ICO or crowdfunding campaign. Our chances to keep developing this project come from those premined coins. Weve set lock-in dates for those premined coins, have a look at the time distribution:
5% - available in 2018 (part of it might be used as airdrops in another project to promote Webchain);
20% - available from early 2019;
30% - available from early 2020;
45% - available from early 2021.