Electrochromic glazing

An electrochromic system comprising:

• a material comprising a substrate coated with a first coating comprising, starting from the substrate:
• a first dielectric coating,
• a silver-based metal functional layer,
• a blocking layer located above and immediately in contact with the silver-based metal functional layer, said blocking layer being chosen from metal layers of one or more elements chosen from nickel and chromium, and metal nitride layers of one or more elements chosen from titanium, nickel and chromium,
• a second dielectric coating comprising at least one conductive oxide layer, a sum of the thicknesses of the conductive oxide layers being greater than 40 nm,
• a first active layer comprising an electrochromic material,
• an electrolyte layer,
• a second active layer and
• a second transparent electroconductive coating,
• optionally a substrate.