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• Preconfigured Ethereum client node for this PoC29 3.5 Summary We have taken our simple authentication for Ethereum accounts concept from our previous chapter and expanded it to make it more convenient. Let’s review our design goals from the beginning of this chapter: • It should allow users with an Ethereum address to use that address to login to a third party website (that supports this login method). After registration, users can login to any site implementing this protocol using their Ethereum address or email address. • It should be easy to use and reasonably easy to setup. It is simpler than our previ- ous example and simple enough for typical Ethereum users: one mobile app to install, one transaction to execute once. • It should not compromise the security of the user’s Ethereum account. Logins are now handled using a separate Ethereum account so the user does not need to expose his valuable Ethereum account. • It should allow users to recover their credentials in case of loss or theft. In case of theft of the mobile device, the user can create a mapping to a new account for logins using his primary Ethereum address. • It should not require knowledge of contracts or manually calling contract methods. The mobile wallet app and Metamask combined isolate users from interacting with contracts directly. • It should have reasonable latency for a login system (no more than a couple of seconds). Logins are only affected by network latency between the authentication server and the mobile device. In other words, they are as fast as any login system. • It should not cost users gas (or money) to login. Users only spend Ether once when first setting up their account. After that, logins to any third party websites do not use gas or Ether. • It should be reasonably easy for developers to implement in their apps. Developers can implement this by calling two endpoints of a RESTful API. Really simple. Not bad for our initial research into integrating Ethereum with classic technologies. This shows Ethereum can be integrated into traditional applications today. The platform works, and the concept of decentralized applications is picking up steam. Another interesting approach to Ethereum authentication is currently under development by uPort30. The landscape of blockchain based applications is still being explored. 29 https://github.com/auth0/go- ethereum 30 https://www.uport.me/ 65PDF Image | Intro to Ethereum and Smart Contracts
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