Git and their various hosting platforms support commit signing as an additional step of verification. There seems to be an active debate on whether it should be used regularly, though I’ll describe it on here in case you want to set it up.
You’ll need to have a GPG key already created.
First locate the key you want to sign with
gpg --list-secret-keys --keyid-format SHORT
This will output something like
/home/user/.gnupg/pubring.kbx ------------------------------ sec rsa4096/8294756F 2020-04-11 [SC] [expires: 2021-04-11] KDIAUBEUX837DIU79YHDKAPOEMNCD7123FDAPOI uid [ultimate] Brandon Rozek (Git) ssb rsa4096/9582109R 2020-04-11 [E] [expires: 2021-04-11]
Copy the string starting with “KDI..". This will be your fingerprint.
Now tell git the key you want to sign with
git config --global user.signingkey $FINGERPRINT
To sign a commit, add a
git commit -S -m "Initial Commit"
To always sign your commits
git config --global commit.gpgsign true
Remember to add your public key to Github, Gitlab, etc. You can get it by
gpg --armor --export $FINGERPRINT