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Is it possible to get IOTAs safely out of an address from which two or more transactions were made already? With safely I mean that there is no chance to get hacked if the third or later transaction is unconfirmed for a long time or invalid.

I have read about the Winternitz hash and the other threads about not making more than one transaction from one source address but I have not found a solution how to circumvent the problem if some funds are still stuck at the source address.

This thread does not provide a solution to the problem: What happens if I receive IOTAs at an address I've already spent from?

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No, it is not possible to reuse an IOTA address without revealing a part of it's private key.

If you own an address, from which you have already spent once, the only solution is to do this.

To see why it's not possible to sign more than once without revealing your private key, you could take a look at these:

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How to get iota out of an address that has already been used twice?

use the CLI wallet https://github.com/iotaledger/cli-app to avoid the "key reuse" error

Is it possible to get IOTAs safely out of an address from which two or more transactions were made already?

If you spent some funds from an address, the address is already not safe to keep anymore IOTA in it. Concerning about vulnerability of spending twice put does not matter since you have already exposed some part of your private key by transferring IOTA from the address.

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