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In the meantime I found a wallet where you actually can start a power down:
https://blurtwallet.com/@yourname/transfers

I keep getting transaction broadcast error... how do you did it?

For the power down you need the active key.

Seems that the problem was trying to use whalevault (their own version of keychain).

using your active key works.

thanks!

How official is this?

100% official, that's the Blurt official wallet.

Yes, this I know, but a wallet without the possibility to withdraw is not a wallet but rather a glass safe without key.