ENS Integration workshop @ EthDenver

- 1. ENS 101 + Basic Integration
Forward lookup/Reverse lookup/ ENS+IPFS
- 2. Hacking ENS (Resolver)
ENS internal / L2 integration, the ENS way
- 3. Optional: Hacking ENS 2 (Subdomain Registrar)

Reference links

https://app.ens.domains
https://discord.gg/AskZbFx
https://docs.ens.domains
https://medium.com/the-ethereum-name-service/cloudflare-and-fleek-make-ens-ipfs-site-deployment-as-easy-as-ever-262c990a7514
https://almonit.eth.link/
https://github.com/ensdomains/ens-twitter-api
https://medium.com/the-ethereum-name-service/a-general-purpose-bridge-for-ethereum-layer-2s-e28810ec1d88
https://github.com/ensdomains/l2gateway-demo

ENS smart contracts

https://github.com/ensdomains/ethregistrar
https://github.com/ensdomains/ens
https://github.com/ensdomains/resolvers
https://github.com/ensdomains/subdomain-registrar

Transcript

2. Agenda - 1. ENS 101 + Basic Integration Forward lookup/Reverse lookup/ ENS+IPFS - 2. Hacking ENS (Resolver) ENS internal / L2 integration, the ENS way - 3. Optional: Hacking ENS 2 (Subdomain Registrar)
3. Read the doc (https://docs.ens.domains ) and join Discord(https://discord.gg/AskZbFx )
4. Your library may already support ENS - Libraries = web3.js/ethers.js/web3.py/web3j - Frameworks: waffle/embark - ENS official library = ensjs
5. 1: ENS 101 + Basic Integration
6. 0x5a384227b65fa093dec...
7. matoken.eth
9. .Adoption (174 wallets & dapps integrations)
11. Reverse Lookup (setting it via app.ens.domains)
13. Reverse Lookup (code)
14. .Adoption (> 400k domains)
15. @ensbot https://github.com/ensdomains/ens-twitter-api
16. souljaboy.eth
17. souljaboy.eth is NFT
19. IPFS + ENS = .eth.link https://medium.com/the-ethereum-name-service/cloudflare-and-fleek-make-ens-ipfs-site-deployment-as-easy-as-ever-262c990a7514 - Set contenthash (Fleek,Temporal, IPFS Pinata) - .eth works on Opera/Metamask/Status - .eth.link for other browsers (mainnet only) - Full detail in the blog post
20. 2: Hacking ENS (Resolver)
21. ENS Architecture (Registry & Resolver)
22. Resolving a name
23. ENS Architecture (Registry & Resolver) - Address - Contenthash - PubKey - ABI - Text record - Multicoin https://github.com/ensdomains/resolvers
24. ENS Resolver extension example: Multicoin support
25. ENS Resolver extension example: Multicoin support
26. Hacking example
27. - L2 platform agnostic (initially proposed by Vitalik) - No platform specific integration required for the end users - No added trust assumption L2 support (Goal) https://medium.com/the-ethereum-name-service/general-purpose-layer-2-static-calls-proposal-presentation-by-vit alik-buterin-at-ens-online-2d752906719e
28. - Each domain owner chooses L1 by updating Resolver - Resolver returns L2 Gateway URL - Client revifies L2 data on L1 L2 support (How) https://medium.com/the-ethereum-name-service/a-general-purpose-bridge-for-ethereum-layer-2s-e28810ec1d88
29. - User can verify L2 state from L1 (✔ Rollups , ? Plasma & State Channel) - User can verify that the data is signed by the same L2 validators (POA, POS, other chains, etc ) L2 support (No added trust assumption) https://github.com/ensdomains/l2gateway-demo/compare/optimism
30. 3. Optional: Hacking ENS 2 (Subdomain Registrar)
31. Subdomain = new hotmail
32. ENS + NFT + Virtual Space
33. .dcl.eth
34. ENS Architecture (Registrar) Registrar FIFSRegistrar ETHRegistrar DNSRegistrar Subdomain
35. Custom Registrar (Decentraland)
36. Custom Registrar (Decentraland)
37. Custom Registrar (Decentraland) contract DCLRegistrar is ERC721Full, Ownable { constructor( IENSRegistry _registry, IBaseRegistrar _base ) public ERC721Full("DCL Registrar", "DCLENS") { // ENS registry updateRegistry(_registry); // ENS base registrar updateBase(_base); } }
38. Custom Registrar (Decentraland) contract DCLRegistrar is ERC721Full, Ownable { constructor( IENSRegistry _registry, IBaseRegistrar _base ) public ERC721Full("DCL Registrar", "DCLENS") { // ENS registry updateRegistry(_registry); // ENS base registrar updateBase(_base); } }
39. Custom Registrar (Decentraland) contract DCLRegistrar is ERC721Full, Ownable { function _register( string memory _subdomain, bytes32 subdomainLabelHash, address _beneficiary, uint256 _createdDate ) internal { // Create new subdomain and assign the _beneficiary as the owner registry.setSubnodeOwner(domainNameHash, subdomainLabelHash, _beneficiary); // Mint an ERC721 token with the sud domain label hash as its id _mint(_beneficiary, uint256(subdomainLabelHash)); // Map the ERC721 token id with the subdomain for reversion. subdomains[subdomainLabelHash] = _subdomain; // Emit registered name event emit NameRegistered(msg.sender, _beneficiary, subdomainLabelHash, _subdomain, } }
40. Custom Registrar (Decentraland) contract DCLRegistrar is ERC721Full, Ownable { function _register( string memory _subdomain, bytes32 subdomainLabelHash, address _beneficiary, uint256 _createdDate ) internal { // Create new subdomain and assign the _beneficiary as the owner registry.setSubnodeOwner(domainNameHash, subdomainLabelHash, _beneficiary); // Mint an ERC721 token with the sud domain label hash as its id _mint(_beneficiary, uint256(subdomainLabelHash)); // Map the ERC721 token id with the subdomain for reversion. subdomains[subdomainLabelHash] = _subdomain; // Emit registered name event emit NameRegistered(msg.sender, _beneficiary, subdomainLabelHash, _subdomain, } }
41. Deriving subdomainLabelHash (aka: tokenID in ERC721) > BigInt(sha3('makoto')).toString() '10875058607269583767816895413117596491787975435502696954128626264198231
42. A few extra steps Contract MyAweSomeApp { function register(bytes32 label) public { bytes32 node = getNode(label); require(ens.owner(node) == address(0)) ens.setSubnodeOwner(rootNode, label, this); ens.setResolver(node, resolver); resolver.setAddr(node, msg.sender); ens.setOwner(node, msg.sender); } }
43. For more info • https://app.ens.domains • https://discord.gg/AskZbFx • https://docs.ens.domains • https://medium.com/the-ethereum-name-service/cloudflare-and-fleek-make-ens-ipfs-site-deployment-as-easy-as-ever-262c990a7514 • https://almonit.eth.link/ • https://github.com/ensdomains/ens-twitter-api • https://medium.com/the-ethereum-name-service/a-general-purpose-bridge-for-ethereum-layer-2s-e28810ec1d88 • https://github.com/ensdomains/l2gateway-demo ENS smart contracts • https://github.com/ensdomains/ethregistrar • https://github.com/ensdomains/ens • https://github.com/ensdomains/resolvers • https://github.com/ensdomains/subdomain-registrar