Wow ! Thank you for your answer again !  It's more clear now ! Don't worry I will not try anything of that on anybody, it's just theoretical!

I'm a Phd student in university and I was just asking myself these questions after some reading on bitcoin  .

Thanks again !

Bonjour à tous, j'ai vu que plusieurs personne sur le forum sont calées en informatique et en mathématique, j'ai une question de math sur bitcoin sur laquelle je cale depuis des heures... Je suis en dernière année de master en sciences informatiques voici la question :

Si on suppose la fonction de hash F qui satisfait la propriété de G,H: F(S||R) = G(S) XOR H(R)  (|| = concaténation)

Combien de temps cela prendrait à produire 1 block avec 64 zéros principal (leading zeros) ? Et pour 100 blocks ?

Toute aide est la bienvenue ! 

Merci !

Thank you for your answer ! 

For the question to explain:

1. Disrupt the network means to take advantage of the control of the network, by any way possible. Make money, prevent peers to make money... What is it possible to do if we have the control of the network?

2. Steal money yes and no, the question is related to the question with the control of the network, if we can control the network (and by that I mean breaking connections between peers) is it possible to make (by any way) or steal money from the peers/from the network (which then we can control).

Hi everybody ! I'm a computer engineer and I have some questions in my mind. I read several research paper which were very interesting about bitcoin.

After those reading I was wondering: suppose we have half the computing power of the bitcoin network would it be possible to double-spend our money?

If we can control the traffic in the network (break connections between any of peers). How could we disrupt the network ? Thus, can we make money?

Thank you very much  !