Rootstock (RSK) Address Resolution guidelines

Resolving an Rootstock (RSK) address associated to a domain consist of 4 steps:

1. Obtain the identifier of the domain.

   Use namehash algorithm

2. Get the domain's resolver contract.

   Use resolver(bytes32)

3. Detect if contract supports addr(bytes32) interface via ERC-165 interface detection.

   Use supportsInterface(bytes4) with interface ID: 0x3b3b57de

   ERC-165 spec

4. Query for address resolution.

   Use addr(bytes32) with the domain identifier.

   addr(bytes32) spec

function getAddr(domain) {
  const node = namehash(domain)
  const resolver = rns.resolver(node)
  if (!resolver.supportsInterface('0x3b3b57de'))
    throw;
  return resolver.addr(node);
}