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What is the probability of the mnemonic or privatekey of the HD wallet being hacked?

  1. It is being used as a wallet created by metamask.

  2. The user is using a wallet with a private key backed up by Metamask for a 100% decentralized application.

  3. The user stores the keystore file on the phone/computer by backing up the keystore file provided by the decentralized app.

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According to this Guessing private keys

The the odds of guessing a randomly generated Ethereum private key is 1 in 115 quattuorvigintillion. (Or, as a fraction: 1/2^256.) That denominator is very roughly around the number of atoms in the universe.

(if you have 12-word mnemonic, the fraction is 1/2^128)

So this means the probabilty of guessing a private key is almost 0.

BUT if you save your key or mnemonic in your computer or your phone. Someone can still break into your computer or phone and find your mnemonic there. So there's always a chance that the place you saved your mnemonic get hacked. We can now say that the chance of not getting hacked is not 0 . Unfortunately, there is no certain number to declare the probability of your computer ( Or phone or anywhere else you saved your mnemonic) getting hacked.

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