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2.3.1.9 9. Test everything together! Open your browser at http://localhost:9080. Now attempt to login by putting your Ethereum address in the input field. A challenge text will be generated. Go to the Mist (Ethereum Wallet) and go to the Login contract. To the right you will see “WRITE TO CONTRACT”. Select the login function and paste the challenge in the text fill that appears there. Then click on Execute. Input your passphrase and send the transaction. Now switch back to the login page. After a few seconds the login will be completed and a welcome message will appear. Voilà! Watch video: “Login”23 This example shows how a typical Ethereum user can use his existing Ethereum account to log in to any third party website supporting Ethereum. And all of this is done without a central server. Although authentication is not performed by the owner of the website, there is no central authority validating the user: it is the Ethereum network that does so. Grab the full example.24 2.4 Summary We have taken a deeper look at Ethereum: a decentralized, blockchain-based framework for devel- oping applications. Applications run on each node, and each state transition produced by them is validated and recorded by the blockchain. The power of the approach extends the concepts of Bitcoin to more than just monetary transactions or simple non-Turing complete contracts. The power of distributed apps is just beginning to be tapped. In the next chapter we will take a look at an actual application developed on the Ethereum network: a two-factor authentication system for Ethereum users using a mobile validator application. Stay tuned! 23 https://cdn.auth0.com/blog/ethereum2/login.mp4 24 https://github.com/auth0- blog/ethereum- login- sample 50PDF Image | Intro to Ethereum and Smart Contracts
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