Chapter 11

1. No, it is only when you require your upgradable contracts that you should use the ZeppelinOS framework; otherwise, it is better to use Truffle.
2. No, you should not have constructors defined for your upgradable contracts, as contract initialization is performed via the Proxy contract.
3. To achieve true decentralization, you need to ensure that future rule changes are not allowed in contract. Using the immutable property of blockchain, smart contracts are made immutable so that the logic or rules cannot be changed once deployed; however, using a ZeppelinOS-like framework, you can create contracts that can be upgraded in the future. This is a centralized form of control and not a decentralized form of control. When using upgradable contracts, your users cannot trust your model, as it can be changed at any time. Hence the ZeppelinOS framework should be used only when...