Field day 2, so to get a list of addresses that could've been OP's challenge address, I went to the "outputs" database dumps of Blockchair and downloaded the spreadsheets for August 1 and July 31 (the former was not available until today hence the wait). It is a little slow, but the download speed is a manageable 10 minutes on a high-speed ethernet network.

The next step is to (1) filter out all the coinbase outputs, (2) filter all the non- pubkeyhash outputs and (3) filter out all outputs <= $10.

Then we filter outputs that are less than $100 because let's be honest, a challenge worth less than $100 are not worth solving when I applied this filter on the website it eliminated a surprisingly large number of transactions.

All spreadsheet software are either lagging or outright crash when I open the DB dump so I have to resort to dirty Python tricks to apply the above.

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I'm sure even most developers have trouble doing that.