The Stake event begins with fixed pool size and staking time. How to deal with fairy things?
- (1) The reward should be fixed at staking time and maybe grow up in the future.
 - (2) The sooner staking is, the more reward the staker gets.
 - (3) The longer staking is, the more reward the staker gets.
 
https://github.com/nhancv/nideas/blob/main/StakingCoinEvent.pdf
