If anyone else has spare GPU hours they don't know what to do with, may I recommend partial hash collisions: https://github.com/DavidBuchanan314/birthday_party
(The "record" set by me only took about 1 GPU day - easy to beat!)
(The "record" set by me only took about 1 GPU day - easy to beat!)
echo 23ca73454a1b981fe51cad0dbd05f4e696795ba67abb28c61aea1a024e5bbeca | xxd -r -p | sha256sum
echo a16a8141361ae9834ad171ec28961fc8a951ff1bfc3a9ce0dc2fcdbdfa2ccd35 | xxd -r -p | sha256sum
It should also be easy to beat with just a few GPU weeks.