Mastering Blockchain Programming with Solidity

Claimable ownership using Claimable.sol

In this chapter, our major focus is on OpenZeppelin version 2.1.1 contract files. However, in the older version of OpenZeppelin, 1.12.0, Claimable.sol was also present as a contract. This contract can be useful for developers, and so we discuss this contract in this chapter. In the new version, 2.0.0, it has been removed. One good feature of the Claimable.sol contract is that it supports transferring ownership in a two-step process:

1. The current owner calls the transferOwnership() function to give ownership to another address, let's say, 0xNewOwnerAddress. The ownership isn't transferred; rather, it is in a pending state.
2. The new owner address, 0xNewOwnerAddress, has to call the claimOwnership() function ...