A million nodes saying a transaction is invalid does nothing to enforce that knowledge. An economic node is a person who refuses to accept invalid money. A node only informs this decision, it cannot enforce it. That’s up to people. And clearly if one is not actually accepting bitcoin for anything at the time, he is not enforcing anything. The idea of a non-economic node is well established, nothing new here. e > On Jun 30, 2021, at 04:33, Zac Greenwood wrote: > >  > Hi Eric, > > > A node (software) doesn’t enforce anything. Merchants enforce consensus rules > > … by running a node which they believe to enforce the rules of Bitcoin. > > A node definitely enforces consensus rules and defines what is Bitcoin. I am quite disturbed that this is even being debated here. > > Zac