Vantablack is indeed one of the blackest materials known to exist. It is made of carbon nanotubes that are grown vertically on a substrate. This creates a forest of tiny tubes that trap light and prevent it from reflecting. As a result, Vantablack absorbs up to 99.965% of light, making it appear extremely black to the human eye.

However, there are other materials that are even blacker than Vantablack. One such material is called "Spectra Black." It is made of carbonized silicon nanospheres that are densely packed together. Spectra Black absorbs up to 99.9999% of light, making it the blackest material ever created.

It's worth noting that the blackest material title can depend on the specific conditions and measurement techniques used, so it's always subject to ongoing research and developments in the field of material science.