Remember to always backup your wallet and any important data.
The blockchain data is stored in a data directory. By default, it’s located in ~/Library/Application Support/Bitcoin/. Delete this directory to remove all blockchain data. You can do this through the terminal or Finder.
rm -rf ~/Library/Application\ Support/Bitcoin/
Delete Configuration Files: Remove any remaining Bitcoin configuration files. These are usually in the home directory and can be hidden. Use the following command in the terminal to delete them:
rm -rf ~/.bitcoin/
After performing these steps, empty your Trash to permanently delete the application and associated files.
