Hacking ENS

Transcript

1. EthLondon, Feb 2020 Makoto Inoue (makoto@ens.domains)
2. Speaker (@makoto_inoue) - Dev at @ensdomains - Organiser @ London Ethereum Codeup - C-founder @wearekickback
3. London Ethereum Codeup
4. Kickback (Current #) 157 / 212 = 74% 4240 / 157 = 27 DAI
5. ENS Hackathon 2018
6. ENS Permanent Registrar Migration - 2019 May
7. ENS is NFT https://opensea.io/rankings
8. NFT Universe
9. ENS will award three total prizes of $600, $300, and $100 for the top three projects that create a new feature for ENS (e.g. in the Manager, Public Resolver, or some other part of ENS)
10. • .eth • Build your • May 4th 2020 Some Hacking ideas
11. Agenda - 1. ENS 101 - 2. BYO Resolver - 3. BYO Registrar
12. 1: ENS 101
13. What is ENS? 0x5a384227b65fa093dec...
14. What is ENS? matoken.eth
15. .Adoption (> 400k domains)
16. .Adoption (32 wallets, 80 dapps)
17. Read the doc! (https://docs.ens.domains )
18. Resolving name (aka forward lookup)
19. Resolving address (aka reverse lookup)
20. Resolving address (aka reverse lookup)
21. 2: BYO Resolver
22. ENS Architecture (Registry & Resolver)
23. contract ENSRegistry{ function _setOwner(bytes32 node, address owner) internal { records[node].owner = owner; } function setOwner(bytes32 node, address owner) public authorised(node) function setSubnodeOwner(bytes32 node, bytes32 label, address owner) function resolver(bytes32 node) public view returns (address) { return records[node].resolver; } } ENS by example: Registry
24. contract ENSRegistry{ function _setOwner(bytes32 node, address owner) internal { records[node].owner = owner; } function setOwner(bytes32 node, address owner) public authorised(node) function setSubnodeOwner(bytes32 node, bytes32 label, address owner) function resolver(bytes32 node) public view returns (address) { return records[node].resolver; } } ENS by example: Registry
25. contract ENSRegistry{ function _setOwner(bytes32 node, address owner) internal { records[node].owner = owner; } function setOwner(bytes32 node, address owner) public authorised(node) function setSubnodeOwner(bytes32 node, bytes32 label, address owner) function resolver(bytes32 node) public view returns (address) { return records[node].resolver; } } ENS by example: Registry
26. Resolving a name
27. Contract MyResolver { address me; function constructor() { me = msg.sender; } function addr(bytes32 node) constant returns (address) { return me; } } ENS by example: Resolvers
28. ENS Architecture (Registry & Resolver) - Address - Contenthash - PubKey - ABI - Text record - Multicoin https://github.com/ensdomains/resolvers
29. .art
30. Duckduckgotor.eth -> onion://3g2up14pq6kufc4m
31. ENSLogin ( EthBerlin 2019)
32. 3: BYO Registrar
33. Subdomain = new hotmail
34. ENS + NFT + Virtual Space
35. .dcl.eth
36. ENS Architecture (Registrar) Registrar FIFSRegistrar ETHRegistrar DNSRegistrar Subdomain
37. Custom Registrar (Decentraland)
38. Custom Registrar (Decentraland)
39. 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); } }
40. 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); } }
41. 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, } }
42. 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, } }
43. Deriving subdomainLabelHash (aka: tokenID in ERC721) > BigInt(sha3('makoto')).toString() '10875058607269583767816895413117596491787975435502696954128626264198231
44. 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); } }
45. A few extra steps
46. For more info • • https://app.ens.domains/ • https://docs.ens.domains/ • https://github.com/ensdomains/subdomain-registrar • https://github.com/ensdomains/ethregistrar • https://github.com/ensdomains/ens • https://github.com/ensdomains/resolvers
47. Thank you! Demo: http://happywedding.julietandnick.eth.link Makoto Inoue / makoto@ens.domains