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From someone who runs a pool its pretty concerning that you dont know how blocks are found. If our software can submit a valid share to a pool, it can also find a valid block and thats all the proof you need. But you already know that or should know that...so once again whats your agenda?
Alas this statement is completely false and thus shows that indeed these miners have not been tested to be able to find blocks.
The usual worry about people who don't understand what they are doing and are only looking for profit.
Even phil has made an attempt at understanding the issue in his post above, but alas not quite got it right.
Edit: I wrote the first, original block testing screen notification code in cgminer

I think I might know what I'm talking about ...
The software is designed for stratum pool implementation. Its not a solo miner, and the solo miner implementation will piggy off open source stratum proxy that connects directly to the node.
Prove how my statement is completely false? Oh wait you cant. As long as our software submits valid shares > pool diff then it will submit a valid share > network diff.
If you want to attack me then attack me with correct arguments, like "since the software is closed sourced I could be throwing out valid shares >= network diff"
Now that im thinking about it that would be a fun way to attack these centralized chinese pools
