Please check related posts in wiki [Governance Overview](https://github.com/poanetwork/wiki/wiki/Governance-Overview) and [Ballots life cycle](https://github.com/poanetwork/wiki/wiki/Ballots-Overview.-Life-cycle-and-limits)
There are contracts' addresses for [sokol](https://github.com/poanetwork/poa-chain-spec/blob/sokol/contracts.json) and [core](https://github.com/poanetwork/poa-chain-spec/blob/core/contracts.json).