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it to the address of the sender or caller of this method. The semantics of Ethereum make sure that the sender is who he says he is. In other words, only the owner of the private key for an address can make calls as the sender to a Solidity method. This makes sure, without any special check, that only the rightful owner of the primary address can establish a mapping between it and a secondary address used for logins. This is the crux of our system. In summary, our contract does four things: • It establishes a mapping between two Ethereum addresses: one high value address (the pri- mary address) and a low value, login-only, secondary address. • It certifies only the owner of the primary address can establish this mapping. • It records this information publicly in the blockchain. • It emits events to monitor and react to changes in the data stored in it. This is all we need to make our system work. Let’s go over the full registration and authentication flow to see how it all works together. We assume the user is the rightful owner of an Ethereum account with a certain amount of Ether. 56PDF Image | Intro to Ethereum and Smart Contracts
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