Quote from: stwenhao on April 15, 2025, 06:04:44 AM

~ if testnet has a small fraction of mainnet hashrate (for example 1%, or even less than that), then any mining pool, at any time, can launch 51% attack

Testnet's hashrate is closer to 0.0001% of mainnet, right? It's really low.

Quote from: mocacinno on April 15, 2025, 06:31:34 AM

Hey, if you ever want to test how a 51% attack would work, testnet would probably be the chain you'd use to do so

If I understand correctly, this would be possible with much less than 51%:

Quote from: vjudeu on November 23, 2024, 08:55:46 AM

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Shower thought: I'm not sure how "chain work" competes against "chain length": can 1 difficult ASIC block wipe out thousands of easy CPU blocks?

Yes. The main limitation is difficulty adjustment: you cannot make "stronger" block, than your difficulty says (because then, everyone would just work on top of the Genesis Block, all the time, and would be guaranteed to throw away the whole chain in the future, with constantly increasing probability).

I think this should work: wait for a block storm. Wait for hundreds to thousands of low difficulty blocks to be mined. Meanwhile, turn on your ASIC, ignore all those CPU blocks, and mine a single block on top of the previous ASIC block. If I understand correctly, this one block will orphan thousands of other blocks.