good remark, as a 51% attack does does not let you do many things. An attack does not mean, that you can pull off anything. For example with most cryptocurrenc

good remark, as a 51% attack does does not let you do many things. An attack does not mean, that you can pull off anything. For example with most cryptocurrencies even with an 51% attack you can't change "from who", "to who" (destination) and also not the "sending amount". Requirement: - most (or enough) people do run a validating node (and not just a SPV wallet) => That is why Bitcoin proponents to insist so much on keeping the main blockchain small and therefore secure (other solutions like lightning, ... can then be level 2 built on the secure layer. But without secure layer 1, you have nothing secure to begin with / built less upon... like less decentralised but more scalable solutions)