My understanding of proof-of-stake is the following: The node that mines the next block is chosen, randomly in proportion to the amount of nodes they have in the network (ex. person who who owns 5% of all the tokens in the ecosystem has a 5% chance of being selected to mine the next block)
The block gets broadcasted throughout the network.
However, based on this principle of randomness, what if a bad enactor is chosen by chance.
What if a person wants to submit a block w/ fraudulent transactions (ex. instead of Bob sending Alice 1 cryptotoken, the fraudster changes up the transaction to make Bob send Alice 100 cryptotokens - assuming Bob owns 100+ cryptotokens)?