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event OwnershipTransferred(address indexed previousOwner, address indexed newOwner)

What is the purpose of this line?

https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/ownership/Ownable.sol

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This line defines an event which can be emitted after something takes place. Clients can then listen for this event and react when it happens. http://solidity.readthedocs.io/en/develop/contracts.html#events

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  • Is it necessary for the ownership of a contract to be transferred? Or is it just an extra functionality? Commented Mar 12, 2018 at 17:01
  • No.. smart contracts can't be edited once deployed. So its good to put it in there just in case. Commented Mar 12, 2018 at 20:08
  • But we can still change the owner address without the event. What do you mean? Commented Mar 13, 2018 at 0:39

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