ENS Integration workshop @ #ETHBerlin

Transcript

1. Ethereum Name Service https://ens.domains #ETHBerlin
2. Speakers @makoto_inoue @DeanEigenmann @_jefflau @aliazam2251
3. Agenda - 1. Intro & What can you do with ENS? - 2. ENS contracts and API overview - 3. Issuing subdomain to new users for your dapp - 4. Summary of ENS workshop (9-11 Aug)
4. Intro: What is ENS?
5. What is ENS? 0xfdb33f8ac7ce72d7d4795dd 8610e323b4c122fbb
6. What is ENS? arachnid.eth
7. What is ENS? arachnid.eth
8. What is ENS? arachnid.eth
9. More than just names ENS names contracts and accounts, but also… • Swarm & IPFS records • Legacy DNS records - IP addresses, mail exchangers • Identity attestation • Stores contract interfaces
10. More than just .eth
11. More than just .eth
12. What can you do with your ENS?
13. 1. Name your address (aka lookup)
14. 2. Show names (aka reverse lookup)
15. Custom swags?
16. 3. Give subdomain
17. ENS contract and API overview
18. ENS Architecture
19. Resolving a name
20. Contract MyResolver { address me; function MyResolver() { me = msg.sender; } function addr(bytes32 node) constant returns (address) { return me; } } ENS by example: Resolvers
21. Using ENS from Javascript import ENS from `ethereum-ens’ const ens = new ENS(web3);
22. Looking up names const address = await ens.resolver(‘arachnid.eth’).addr();
23. Reverse resolution const addr = ‘0x112234455...’ const name = await ens.reverse(‘0x112234455...’).name() //for security const addr2 = await ens.resolver(name) if(addr === addr2){ …. }
24. Setting up reverse resolution reverseRegistrar.setName(‘jefflau.eth’)
25. Contracts in web3 var testContract = web3.eth.contract( [{"constant":true,"inputs":...}]) var test = testContract.at(“0x0904dac3347ea47d208f...”);
26. Contracts in ENS const contract = ens.resolver(‘arachnid.eth’).instance(); contract.myContractMethod()
27. Issuing subdomain to new users for your dapp
28. Zinc signup flow Make sure - User is on the right network - Metamask is unlocked
29. Getting ENS subdomain Check if the ENS subdomain already exists - If yes, then check if it is owned by the address currently on metamask - If yes then its a sign in, make them sign a message to prove they actually hold the acount they are signing up for. If it doesnt exist then they can have it!
30. Sign up Subdomain transactions are sent asynchronously so users can start using the platform instantly
31. Verify account Signing a message to verify they hold the account A nounce to prevent replay attacks
32. Account Users are logged in regardless of the status of transactions. (UX comment) Since Zinc sends the transactions and the messages are verified on chain, they are also verified off chain to prevent sending transactions which are guaranteed to fail.
33. The code const prepSub = nameprep(sub) const prepDomain = nameprep(domain) const setSubnodeOwner = setSubnodeOwnerTx( prepSub, prepDomain, ZINC_ETH_ADDRESS ) const setResolver = setResolverTx(prepSub, prepDomain) const setAddr = setAddrTx(prepSub, prepDomain, address) const setSubnodeOwnerToUser = setSubnodeOwnerTx( prepSub, prepDomain, ownerAddress ) const setSubnodeOwnerTx = (....){ const node = namehash.hash(domain) const label = web3.utils.sha3(sub) const txData = { nonce: web3.utils.toHex(transactionNonce), gasLimit: web3.utils.toHex(DEFAULT_GAS_LIMIT), gasPrice: web3.utils.toHex(getGasPrice()), to: ENS_REGISTRY_ADDRESS, from: ZINC_ETH_ADDRESS, data: ensRegistry.methods .setSubnodeOwner(node, label, ownerAdress) .encodeABI() } return signTx(txData) }
34. ENS Workshop & Hackathon Retrospective
35. ENS as an entry point into blockchain - Onboarding users - Forwarding them to various dApps - Every dApp should be an entry point! - dApps should give users subdomains
36. ENS Governance - Blacklists - We can only block not take control of - Social Consensus bro! - Needs a dispute resolution system - Allow users to choose blacklists - How do we keep arbitrators honest? - Set of guidelines, what is an infringement?
37. Registrar and Rent - Auctions suck - We need an instant process with rent - Users should be able to prefund domains - $10-$30 - Prices can’t vary too much - https://discuss.ens.domains/
38. Hackathon https://github.com/ensdomains/hack2018/issues
39. Hackathon Winner (ensnifty.com) https://medium.com/the-ethereum-name-service/ens-hackathon-winners-interview-1st-place-23fcead92afd
40. Runner ups (firefly ENS integration) https://medium.com/the-ethereum-name-service/ens-hackathon-winners-interview-2nd-place-79d7831e2212
41. Runner ups ( ENS address books) https://medium.com/the-ethereum-name-service/hackathon-winners-interview-the-joint-3nd-place-ens-girls-17693090195a
42. https://medium.com/the-ethereum-name-service https://docs.ens.domains/en/latest http://github.com/ensdomains References
43. Questions?