Picture a small town with one well. Every spring, the town hands out the right to sell water for the year. The rule sounds fair on paper: shares go out in proportion to how many shares you already hold. The pump runs every morning. The meters read normal. If you only checked whether water comes out of the tap, you would say the town is doing great. Now look at who owns the shares. The same three families have held them for twenty years, and each spring they get a bigger slice. A newcomer can drink the water. A newcomer cannot buy in. I think of this as the zombie chain test. A blockchain is a shared record of payments that many computers keep in sync. A network can keep adding blocks, which are batches of payments, every few seconds and still shut new people out. Three things have to be true together. First, a small group controls most of the block production. Second, the rewards for producing blocks are paid in the same coin, so that group keeps growing its own share. Third, nothing pushes those coins back out to new holders. Bitcoin has a release valve built in. Miners are the computers that compete to add each block, and they burn real electricity to do it. The power company wants dollars, pesos or euros, so miners sell coins to pay the bill. Every month, coins leave the people who mine them and land with people who buy them. Here is the fair counterargument. The test only fires when the setup is lopsided, and lopsided setups can be fixed. Some networks people call zombies have worked fine for years. Bitcoin has a weak reading of its own too: a handful of mining pools, which are groups of miners that combine their work, coordinate a big share of blocks, even though any miner can switch pools in minutes. How I would know I am wrong: track four numbers over time. How concentrated block production is, how many new participants show up, how much supply sits outside the top group, and how independent the operators are. If all four improve, the test fails for that network. I've held bitcoin since 2015. A running pump tells you the water flows. The share list tells you who owns the well. if this gave you a better test than uptime, Zap ⚡