NewBase return Base contract instance.

NewNodeVotes return Proposals contract instance.

NewProposals return Proposals contract instance.

NewSystemRewards return SystemRewards contract instance.

DevMappingPosition is the position of the state variable `devs`.

ValidatorProposalsABI `Proposals` contract in systemContracts.

ValidatorsABI contains all methods to interactive with validator contracts.

using for Validators contract's initialize.

max bytes length: 10000.

max bytes length: 100.

using for Validators contract's initialize.

SysGovToAddr is the To address for the system governance transaction, NOT contract address.

EpochInfo struct `epoch` in SystemRewards contract.