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And with a tiny bit of network knowledge and equipment it's easy to see where where data is flowing to and from for your miner. And see where and what is being done.
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Alas you cannot, it encrypts the 'extra' data inside the miner, so you can only see 'where' it is going.
You cannot see how much the fee is nor what other data is sent.
Also it's close source so you can't even check any of that.
In theory you can get close if you are not mining at the same pool they are. IF you just follow the where you can see how many stratum requests do to dave pool and how many go to slushpool.
Some basic math will get you in the ballpark. You would probably not be able to see 2.5% vs 3.25% but could figure out 2.5% vs 7%
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Alas that theory is based on nothing.
Current stratum has 2 things that come and go except during connections. Work from the pool and shares to the pool.
Though due to slush not wanting to fix his pool code and fix stratum, when I argued it with him at the start, stratum has two items related to work.
Their pool already claims to allow other information to be passed, but since it's encrypted, you cannot tell when or how often other information is passed to slush and what it is.
Assuming it will only be shares and work is already obviously incorrect.