`sudo pacman -S archlinux-keyring`

`sudo pacman-key --init`

`sudo pacman-key --populate archlinux`

`pacman-key -h` help command to see every operations

-a, –add: Add the specified keys (empty for stdin)

-d, –delete: Remove the specified keyids

-e, –export: Export the specified or all keyids

-f, –finger: List fingerprint for specified or all keyids

-l, –list-keys: List the specified or all keys

-r, –recv-keys: Fetch the specified keyids

-u, –updatedb: Update the trustdb of pacman

-v, –verify: Verify the file(s) specified by the signature(s)

It's recommended (even I don't personally usually do this) to clean system whit `sudo pacman -Scc` and `sudo pacman -Syy` commands, where first clear package cache and second update package database.

This is main command to update keyring to your operation system

This command initilize properly the pacman keyring and they has required access permissions. It also generates a unique OpenPGP key for the user.

This command commit these keys under your master key which is on your operation system