There are loads of other rules to abide by before you can call yourself Champagne, the first one is to use only Pinot-noir, Pinot-Meunier, or Chardonnay as grape varieties.
With these 3 varieties, you can blend as you want or make single-variety wines, Chardonnay only would be called Blanc de Blancs, white juice from white grapes. Pinot-noir and Pinot-Meunier would be Blanc de Noirs, white juice from black grapes.
Another very important rule is that the second fermentation takes place in the bottle and that is how you capture the bubbles.
Big Champagne houses have massive advertising budgets and you will see them on fancy events very often, we would recommend you try some grower champagnes, actual winemakers that do everything themselves, from growing the grapes to bottling and letting age in their cellars.
Try our dynamic winemaker Michel Marcoult and you won’t be disappointed, they are very innovative and extremely eco-friendly and produce amazing wines.