So, implications-wise: where is the rub here? Where can this be used or exploited for fun or profit?
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1.) Pick one of the old abandoned Bitcoin addresses
2.) Start looking for a key match using this technique
3.) Heat death of the universe
4.) Profit!
I wonder how many of the Lastpass vaults had the private keys in the very unencrypted notes sections...
Find somewhere people look at only a small fraction of a hash?
That's mostly git commits.
Oh, that's evil.
In some places my tooling only shows 7 digits of the git SHA. I wonder how hard it would be to write something to tweak my commits until those are all the same. And I wonder how long it would take until someone noticed...