marmalade92

I am very skeptical for the blockchain technology and although I use it as a gambling addiction (or it uses me) I still use zero crypto based technologies.

Within my skepticism, I started wondering what can make the chain vulnerable?

My first idea was flooding with almost non worthy transactions therefore wasting the miners. This was quickly debunked as I found out the miners would ignore 'empty' transactions.

Another idea is, what if I as user A say want to transfer to user B, but I mention an amount of coins that actually I do not own and spam it. Would the miners have to traverse all the way to the back or are there 'checkpoints' that can assure short travels?

The last one is a bit more difficult. However can a big enough network of nodes, insert itself and start crunching the chain errors-fully on purpose to 'break' the chain?

Excuse my ignorance.