ENS: Ethereum Name Service

namehash([]) = 0x0000000000000000000000000000000000000000000000000000000000000000
namehash([label, …]) = keccak256(namehash(…), keccak256(label))

var address = await ens.name('be-rich.eth').getAddress();

abstract contract ENS {
    function resolver(bytes32 node) public virtual view returns (Resolver);
}

abstract contract Resolver {
    function addr(bytes32 node) public virtual view returns (address);
}

contract MyContract {
    // Same address for Mainet, Ropsten, Rinkerby, Gorli and other networks;
    ENS ens = ENS(0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e);

    function resolve(bytes32 node) public view returns(address) {
        Resolver resolver = ens.resolver(node);
        return resolver.addr(node);
    }
}