This question is an exact duplicate of:
I am interested how bitcoin managed to prevent 51% attack in the beginning? I am about to create my own coin and i want miners to mine blocks. but The problem is I am afraid 51% attack might destroy my blockchain.What'd be your advise? how did bitcoin make it possible that it has come this far? What if i use proof of stake and proof of work together? Someone told me it's possible that i can use both. so that 2 blocks get added by proof of stake and then the following 1 block must be proof of work. then 2 blocks will be confirmed by proof of stake and so on. that way, no one can't add 3 blocks by proof of work. i just want to know and need your ideas about 51% attack prevention on newly created coin. Thanks . If this is the inappropriate group, I'm sorry.