Staking contract is currently deployed at Callisto Mainnet: https://explorer2.callisto.network/addr/0xd813419749b3c2cdc94a2f9cfcf154113264a9d6#tab_addr_1
Compiled with REMIX solc version:0.4.25+commit.59dbf8f1 optimization enabled.
Reference implementation of smart-contract based cold staking protocol. Formal descriptin will be released later.
https://docs.google.com/document/d/1LpRHzW7gGV1JfiXUQOmW-UEVF9TCNNWrYiItDuLgiGA/edit?usp=sharing
The protocol is currently in proof of concept phase.