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This is why many places of business require 3-6 block confirmations to render goods/services. However, as miners get more centralized, this should really be raised to 10-30 block confirmations, if you don't trust the miners to play nice.
this territory is moderated
My understanding... is that Foundry in this case (or any miner) would need to effectively mine 7 blocks consecutively (before any group of miners could collectively) without broadcasting any of them.
Then after the 6th block in the 'honest' chain is broadcast (6th block or 'confirmation' after a transaction occurs) Foundry would have to suddenly broadcast all 7 blocks which would not include some or many of the transactions that just took place 6 blocks before.
This would basically be... a 're-org' after 6 blocks (how long it takes for full confirmation.)
Basically, just mine 7 consecutive blocks in sequence, without announcing any of them, before 7 blocks can be added to the chain consecutively (by any number of miners). Then 'suddenly' announce the 7 blocks, potentially not including transactions that people had waited 6 confirmations for.
In order to 'double-spend' or 're-spend' UTXOs that are now unspent.
I believe that's my understanding.
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Or just use Lightning...
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