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$ sudo pacman -S libsignon-glib 
resolving dependencies...
looking for conflicting packages...

Package (1)             New Version  Net Change  Download Size

desktop/libsignon-glib  1.12-1         0,30 MiB       0,05 MiB

Total Download Size:   0,05 MiB
Total Installed Size:  0,30 MiB

:: Proceed with installation? [Y/n] 
:: Retrieving packages...
 libsignon-glib-1.12-1-x86_64      46,3 KiB  1157 KiB/s 00:00 [#################################] 100%
(1/1) checking keys in keyring                                [#################################] 100%
(1/1) checking package integrity                              [#################################] 100%
error: libsignon-glib: signature from "Luca Giambonini <gluca86@gmail.com>" is unknown trust
:: File /var/cache/pacman/pkg/libsignon-glib-1.12-1-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] 
error: failed to commit transaction (invalid or corrupted package (PGP signature))
Errors occurred, no packages were upgraded.

$ pacman -Sii libsignon-glib
Repository      : desktop
Name            : libsignon-glib
Version         : 1.12-1
Description     : GLib-based client library for applications handling account authentication through
                  the Online Accounts Single Sign-On service
Architecture    : x86_64
URL             : https://gitlab.com/accounts-sso/libsignon-glib
Licenses        : LGPL2.1
Groups          : None
Provides        : None
Depends On      : signon
Optional Deps   : None
Required By     : telepathy-accounts-signon
Optional For    : None
Conflicts With  : None
Replaces        : None
Download Size   : 46,29 KiB
Installed Size  : 308,00 KiB
Packager        : Weng Xuetian <wengxt@gmail.com>
Build Date      : tis 15 sep 2015 07:28:03
MD5 Sum         : 079971fd47a5cfe1d47d0632cbace8b9
SHA-256 Sum     : 42d245ad8b9033af03f35129529d6d5e28c8e62e0baf06bb7b8464d5bd7f59f5
Signatures      : 88DE884F278A4200

Add this to core.git – it is required by telepathy-accounts-signon.