Things need to be done in Darwinia/Crab 2.0

[hackfisher]

Darwinia 2.0 means that the chain is required to be restarted as a new chain, but the chain state of current Darwinia(1.0) will be reserved and exported as the genesis state of Darwinia 2.0. During the stop of Darwinia 1.0 and start of Darwinia 2.0, block production will stop.

The time of Darwinia 2.0 launch is unknowable and unpredictable for now, it is not on the plan, and something we should avoid in near future due to its very low priority.

This thread is to track the things need to be done in 2.0 we know now, the other parts in the scope is still unclear and to be researched.

1. The decimal of 2.0 native balance will be changed from 9 to 18, smart chain keep unchanged as 18. The type of native balance will be changed from u128 to u256.
2. Warning the smart contract developers should NOT use block.number as the block environment of ethereum tx, especially block.number could be reset to zero. They should use block.timestamp instead. Warning the smart contract developers should NOT use block.number crab-docs#140

Other things to discuss.

[hackfisher]

Next version of Staking: #912

[hackfisher]

Considering beefy mandatory relay costs, change and make era period larger. (Darwinia 4 days? Crab 1 days?)

[hackfisher]

Move the beefy support to Darwinia 2.0, and use EcdsaAuthorities for the Ethereum theMerge plan. (And wait for BLS support)