>>Contracts can’t be changes (so you have things like the issues with parity multi sig contracts). Contracts can be changed if they're made upgradeable. The ex

>>Contracts can’t be changes (so you have things like the issues with parity multi sig contracts). Contracts can be changed if they're made upgradeable. The execution environment is Turing Complete, so it's up to the developer to make contracts secure, upgradeable, etc.