Thanks for the great info.
Yesterday I opened an account in Streemian. and I was asked for the active key. Why do they need the active key and not just the posting key, like @chainbb, for example?
I believe Streemian is one of the central applications in the Steem community, so I ended up entering the keyword. Perhaps I should have asked them first by email.
Is there a way to change the active key, or the main key, in case one has doubts like these?
You should ask them to explain what it is used for. My understanding is that it is a one time thing to add a new posting key to your account. You can change your keys to get a new owner key. Just make sure you properly save your updated key information.
thank you for your quick reply. I´ll do that.