Intro to Ethereum and Smart Contracts

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Intro to Ethereum and Smart Contracts ( intro-ethereum-and-smart-contracts )

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3. A new Ethereum address is generated behind the scenes by the mobile application. This is the secondary address. This address is sent to the user to his or her email for convenience. 4. The user establishes a link between his or her primary Ethereum address and this secondary address. To do so the user can manually call the mapAddress method of the Mapper contract or use a special wallet app developed for this purpose. This step requires the user to spend a minimum amount of gas from his primary account. 5. Once the link between addresses is established, the mobile application will show a confirmation dialog. If the user confirms, the mapping is established and the process is complete. One of the added benefits of this approach is that it makes throwaway accounts harder to use. Point 4 forces the user to spend Ether to establish the mapping between his personal Ethereum address and the login-only address. This way, third-parties can be sure that the Ethereum account used by the user is not a throwaway account (i.e. a spam account). 58

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