FreeBSD_Update [FreeBSD WIKI]

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FreeBSD Update is a binary update mechanism for FreeBSD's “base” distribution. It consists of a server and client component

    # fetch http://update.freebsd.org/12.0-RELEASE/amd64/pub.ssl     # Get public key. Verify the signature yourself
    # fetch http://update.freebsd.org/12.0-RELEASE/amd64/latest.ssl  # Get metadata

    # openssl rsautl -pubin -inkey pub.ssl -verify <latest.ssl
}}} 
Output looks like:

{{{
    freebsd-update|amd64|12.0-RELEASE|10|cae42a89f90be555b530a759cd400925bce03ed73ee78e665bef3fe5293e872f|1576022400

“10” in the output of this example refers to p10, the 10th patch level for 12.0-RELEASE amd64

How to check for latest available version