apt-key list
/etc/apt/trusted.gpg
--------------------
pub dsa1024 2007-03-08 [SC]
4CCA 1EAF 950C EE4A B839 76DC A040 830F 7FAC 5991
uid [ unknown] Google, Inc. Linux Package Signing Key <linux-packages-keymaster@google.com>
sub elg2048 2007-03-08 [E]
pub rsa4096 2016-04-12 [SC]
EB4C 1BFD 4F04 2F6D DDCC EC91 7721 F63B D38B 4796
uid [ unknown] Google Inc. (Linux Packages Signing Authority) <linux-packages-keymaster@google.com>
sub rsa4096 2019-07-22 [S] [expires: 2022-07-21]
pub rsa4096 2017-02-22 [SCEA]
9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88
uid [ unknown] Docker Release (CE deb) <docker@docker.com>
sub rsa4096 2017-02-22 [S]
/etc/apt/trusted.gpg.d/ubuntu-defaults.chroot.key.gpg
-----------------------------------------------------
pub rsa4096 2016-05-24 [SC]
302F 0738 F465 C153 5761 F965 A661 6109 451B BBF2
uid [ unknown] Linux Mint Repository Signing Key <root@linuxmint.com>
sub rsa4096 2016-05-24 [E]
...