code: func (net *Network) Resolve(targetID NodeID) *Node {
  	result := net.lookup(crypto.Keccak256Hash(targetID[:]), true)
  	for _, n := range result {
  		if n.ID == targetID {
  			return n
  		}
  	}
  	return nil
  }
docs: // Resolve searches for a specific node with the given ID.
  // It returns nil if the node could not be found.