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Scroll down and look at the last 1,000 blocks of unknown hashrate. It's ~23% (and 1-3% of that are solominers or unknown pools that aren't qubic).
The 51% attack never happened. It's intermittent reorgs from a pool selfish mining.
Monero (XMR) RandomX | Mining Pools
List of known Monero pools (XMR) RandomX PoW algorithm. Live hashrate distribution, pool fees & minimum payment comparison. Mining Pools & Block Ex...
"Qubic never actually hit 51% btw. Don't fall for it.
However they do have a large enough hashrate to perform multi-block re-orgs with their selfish mining strategy.
They disabled API hashrate reporting so that they could lie about it.
Keep mining and ignore the noise."
https://xcancel.com/tuxpizza/status/1955191610410401816
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What 'exactly' is selfish mining?
If it just means that you build new blocks on top of the most recent block that you mined yourself, then that won't work for a long time unless you have at least 51%
So I guess it's something slightly more subtle; e.g. they'll try to build on their own block, but will give up every time they fall X blocks behind.
Is that it? And what is X?
I can see how that could work if you have less than 51% of the hashrate. Where 'work' is 'steal some block rewards and encourage other miners to switch off'