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@sarah249 thse are all supporting facts about block chain... what about dangerous situations which will arise due to block chain?

@aabidlone what dangerous situations ?

if someone hacks into this... he wll alot of control on it

its alot more secure than the centralized systems we have. hacking and taking control of the blockchain is one hell of a task and if its something with alot of nodes then the chances are very low. the same effort into centralized system for hacking can be successful alot quicker.