The WebAssembly VM provides a sandbox to ensure application safety. However, this sandbox is also a very limited "computer" that has no concept of file system, network, or even a clock or timer. That is very limiting for the Rust programs running inside WebAssembly.
In the Second State VM (SSVM), our innovation is a set of standard and proprietary (still open source) extensions that allow WebAssembly bytecode applications to access system and external resources. Read on!