After doing some research it is supposed to be under ~/Library/Application Support/Bitcoin/
But on my computer there is no Bitcoin.conf under ~/Library/Application Support/Bitcoin !
So where do I find Bitcoin.conf?
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Bitcoin.conf usually arent come with it so you have to make one manually by making a file and naming it
After you made it, you can use the link below to use the configuration as template
Hope the answer above is what your looking for
by default it goes into the path that you described. If the path was changed, then a search in finder can help. However: search in finder doesn't look into every directory. Try to search for filenames "wallet.dat" or "mempool.dat". Also press the left ALT key, and chose "go to", and select library. Then again do the search in finder. Only then my location was found with the mentioned files. If this doesn't help, open a terminal, and try this:
cd /Users find . -type f -name wallet.dat
there might be many Permission denied messages, but it would show, if file was found. If not, there is simply no message. If this still doesn't help, go another directory up ("cd /"), and try again. Time to search will massivly increase then...