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2056d
If a mining cartel gets above 51% they can change the rules however they want. By then the only limit is how the ecosystem in the form of exchanges react when the same miners try to cash in on their newly forked
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currency.

If the miners do the attack while willingly taking losses just to ruin a currency it's extremely hard to stop. That's why it's so dangerous to have a low hashrate.
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Currently bitcoin has 53 Exahashes while bch has 3. A 51% attack would need 1.5EH+. That is something that quite a few actors in this space has available. Rewriting or grinding the BCH
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chain to a halt is dangerously feasible.

This is unrealistic but as a comparison it would take the current
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btc hashrate just 25 days to completely rewrite (IE double spend or whatever shenanigans) the entire bch chain since the fork.
Metalbrushes_Tattoo
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Sorry. I hate to sound like a total idiot but could you please ELI5 this topic a little further? Not gonna lie, reading what you said gave me some major FUD 😬
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I think the economics deters them from doing so. this decision devalues all of their current holdings as they all compete for block reward, why inflate their own currency?
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This is something i've thought about a lot too. If all the miners make a decision, even increasing the coin supply or block reward no one can really stop them, save selling their coins