A miner can catch a block and not broadcast the result to the network but start mining a new block.

Does this mean someone is hovering in another chain?

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It's possible, my friend. When a miner successfully mines a block, they have the option to either broadcast it to the network or keep it private and start mining a new block on top of their own secret one. This is referred to as "selfish mining."

If this happens frequently enough, it can result in two different chains emerging with different transaction histories. This is known as a "fork," and it can create confusion in the network until consensus is reached on which chain should be considered valid.

So yes, someone could potentially be hovering in another chain if they are engaging in selfish mining behavior and keeping their mined blocks private for an extended period of time. However, this type of activity can also lead to negative consequences for the miner if discovered by other participants on the network.

Sounds like an attack vector albeit a minor one because difficulty is so high you’re not likely to mine two blocks in a row before someone else proposes a valid block reaching consensus that outpaces yours?

I don't understand you.

But the very fact that I have caught a block and can use this knowledge to my advantage leads me to believe that it is possible to create the longest chain)

thereby questioning the algorithm that bitcoin uses.

It will not be difficult to create a super simple laser miner.

Have a few setups and do a trial run on bicoin-cache.

ok. suppose someone can turn on 49% of the network now using a different algorithm to calculate and search for when the recalculation of complexity will happen? in 1 week) and this already gives reason to worry)

i don't care what will happen there. yesterday it was shells, then gold, then fiat, then bitcoins, then another currency))) it has nothing to do with life itself.