snapcraft signing model assertion process does not support revocation of the signing keys. How to reproduce: 1) Login snapcraft > snapcraft login 2) Create default key (need to be done only once) > snapcraft create-key 3) Generate timestamp > date -Iseconds --utc 4) Copy the result of date into the timestamp field of the model file e.g. board-model.json 5) Log into your account and copy "Snap account-id" into both the "authority-id" and the "brand-id" fields in the file board-model.json: https://dashboard.snapcraft.io/dev/account/ 6) Create a new model assertion by running: > cat board-model.json | snap sign -k default &> board.model 7) There is no way to revoke the created key.