Ultimatter

A micro black hole surrounded by a shell of structural diamond. Nano tubes and quantum dots providing 20th century internet levels of processing power to each molecule sized node.
Varying the radius of the structural node controls the separation of the black holes in the matrix. Charge swapped in and out of the singularity gives precise control over the binding strength of the nodes to each other. Configured for ultimate tensional strength, with event horizons separated by just a few atoms of carbon, it becomes the toughest material in the universe.