https://github.com/canonical/craft-archives/blob/7c35cc475af18f1525e75b206e828a3b1bf23a38/docs/reference/repo_properties.rst?plain=1#L2 The documentation does not explain how to use a local GPG key instead of relying on a key server. For instance I would expect this explanation to be somewhere: https://github.com/canonical/craft-archives/blob/7c35cc475af18f1525e75b206e828a3b1bf23a38/craft_archives/repo/apt_key_manager.py#L81-L98 Along with the path the key must be in (`snap/keys/lasteightcharacters.asc`), and that local keys would be privileged over remote keys: https://github.com/canonical/craft-archives/blob/7c35cc475af18f1525e75b206e828a3b1bf23a38/craft_archives/repo/apt_key_manager.py#L249-L253 In general, an explanation on how to get the ASC, identify the fingerprint, and the ID would be exceptionally useful (as most people are still quite unaware of how GPG works or what these things mean...)