Below is the top metal layer artwork from some of the chips I've done. There are a few others I'm not allowed to post here.
All of the chips produced by Western Semiconductor have its (airgapped, long-term) key fingerprint on the top metal layer.
To import a signed key that I have sent you, use this command:
gpg --import < amjoseph-key-and-topmetal-signature.pgp.txt
You can also download the signed key.
To verify a signed message that I have sent you, use this command (you should check the trusted-key argument against the top metal layer):
gpg --trusted-key F0B74D717CDE8412A3E0D4D5F29AC8080DA8E1E0 --verify < message.txt
