Wow 😲 you have wealth knowledge of all the keys and I'm glad to know this, but note, Master key and owner key almost function the same, but Master key is the most powerful! Let me tell you one of it's function you didn't mention, the Master key can be use to change itself, yes that is why it's stressing that you kept it save because if someone lay hands on it, he/she will change it and have full owner of your account.

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