IOHK base proposal ETCS: https://iohk.io/research/papers/#a-proposal-for-an-ethereum-classic-treasury-system
Read full description here: EthereumCommonwealth/Roadmap#53
Read explanation article here: https://medium.com/@dexaran820/callisto-treasury-governance-system-and-cold-staking-update-2dc1b13f5ad5