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The root trust of Arch Linux is established by a set of three or more main signing keys held by one developer each. For each main signing key there is one holder of a revocation certificate in the developer group, who is not also a holder of a main signing key.
Each packager's signing key is signed by at least three valid main signing keys.
The status of and relationship between main signing keys and packager signing keys can be reviewed on https://archlinux.org/master-keys/