[homakov]

When working on a project https://github.com/xlnfinance/xln (a financial account network between entities) I stumbled upon a problem that you need a way to emulate a real network deterministically. Then i realized every blockchain is just replicated state machine so why dont we encapsulate every user node into Runtime->Entity->Account hierarchy of 3 state machines. Each outer machine fully controls the inner one. Like "blockchain inside blockchain" with different consensus modes.

Then I googled for "hierarchical state machines" and found statecharts. These two ideas are somewhat similar so here are my 2cents. Imo more software should use hierarchies of state machines to fight the worst class of bugs with non-determinism.