Then you look at the sign-up sheet. Nobody under sixty has joined in eleven years. The station runs because the same twelve people keep showing up. The day they stop, the trucks stay parked, however clean they are.
I think about that station when someone asks me whether a blockchain is alive.
Some background first. A blockchain is a shared record of who owns what, kept by many computers at once. The people who keep those computers running are called operators. Some check every transaction. Some, called miners, spend electricity to add new pages to the record.
A network can keep adding pages for years after the life has gone out of it. The blocks keep coming, like the Friday siren. I call that a zombie chain. It moves, it makes noise, and nobody new is learning to run it.
So I start with one question. Who joined this year? Are new people setting up their own computers to check the record? Can a stranger with a spare machine in a garage start helping tomorrow, without asking anyone for permission? Or is it the same few operators, getting older and more tired, with no one behind them?
The pushback is fair. Plenty of systems run well on a small, loyal crew for a long time. A few skilled people can be safer than a crowd of beginners. And headcount is hard to measure from the outside, because one person can run ten machines and ten people can share one.
All of that holds. A small crew still ages, though, and a network that only works while the same faces stay is one retirement away from trouble.
What would show me wrong: a network with almost no new operators for years that keeps running safely, with no rise in outages, no takeover by a few players, and no rescue from a single company.
I hold Bitcoin to the same test. Anyone can run a node, which is a computer that keeps its own copy of the record and checks every rule, and an ordinary laptop can do it. Anyone can plug in a miner at home. I have been a bitcoin miner since 2015, and every year I still meet someone who set up their first node last month. I keep my eye on that sign-up sheet.
if this gave you a way to check whether a network is alive, Zap ⚡