class ContractRegistry:
    def __init__(self):
        # store contracts as {(name, version): contract_dict}
        self._store = {}

    def register_contract(self, name: str, version: str, contract: dict):
        key = (name, version)
        self._store[key] = contract

    def get_contract(self, name: str, version: str):
        return self._store.get((name, version))