Bagels Blisters

I used to think that bagels is difficult to make before I got into my bread making hobby. When I read Cril Hitz's Baking Artisan Breads I didn't find it too intimidating so I decided to give it try.
His method takes 2 days to make the bagels, making the dough and shape the bagels on day 1 and then boil and bake the bagels on day 2.

I noticed that all my bagels crust have fill with many tiny bubbles and I was wondering why. I googled it but I couldn't really got a definite answer. So I post my question at The fresh loaf where all the artisan bread bakers exchange their experience and knowledge. The post is here but I have learned that it is normal for a bread that develop this kind of condition from the long cold fermentation and that's nothing wrong with it.

One of the posters quoted

"Bubbles on the crust, a result of retarding raw loaves at refrigeration temperatures, are well received in North America. In France, bubbles are considered a defect".

Quote from Raymond Calvel's The Taste of Bread.

Now my next challenge is to make bagels without long fermentation but still taste as good with good texture.

Full of blisters on the crust

Most people don't mind my bagels that have blisters on them, because they taste very good.