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After this is done everything is set! Watch video: “Register Using the Wallet Webapp and Metamask”18 3.4.4 Login to Our Test Site You may now login to any third party site that supports this authentication method using either your email address or your primary Ethereum address as a credential. Go to our sample website19, put your email address and click Login. Watch your smartphone for notifications to approve your login. You will notice there is a checkbox labeled Trustless Authentication. As explained before, third parties may opt for different levels of security. They can opt to trust the authentication server when it says the login is valid (trustful authentication) or they may opt to not trust the authentication server and validate the signature internally. In this case, the third party website must validate the signature of the secondary address itself, first be querying the secondary address using the Mapper contract (which is publicly available) and then by verifying the signature of the returned data using the secondary address to find the public key of the secondary address. This provides the highest level of security and uses the authentication server as simply a messenger. Watch video: “Login”20 3.4.5 Explore the Code If you are interested in taking a closer look at how our PoC works, here are all the repositories: • The authentication server21 • The mobile app22 • The sample third party web app23 • The registration wallet using Metamask24 • Docker scripts for easy testing25 There are also a couple of helper libraries that were developed for this PoC, these are used by the repositories above: • Ethereum crypto helper lib26 • JavaScript library for doing auth as used by this PoC27 • A simple database abstraction helper28 18 https://cdn.auth0.com/blog/ethereum3/Wallet- Register- Rinkeby.mp4 19 https://auth0- ethereum.com/authzero 20 https://cdn.auth0.com/blog/ethereum3/Login.mp4 21 https://github.com/auth0/ethereum- authentication- server 22 https://github.com/auth0/ethereum- authenticator- app- public 23 https://github.com/auth0/ethereum- sample- web 24 https://github.com/auth0/ethereum- browser- wallet 25 https://github.com/auth0/ethereum- docker- deployment 26 https://github.com/auth0/ethereum- crypto 27 https://github.com/auth0/ethereum- auth- client 28 https://github.com/auth0/ethereum- user- db- service 64PDF Image | Intro to Ethereum and Smart Contracts
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