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His wallet app is a fork of bitcoin wallet, so in that sense he isn't. But in terms of this particular dogecoin wallet app, he seems to be the original dev. He does seem to keep rebasing against bicoin wallet, though, so I guess his knowledge of the inner workings of this app might be in fact limited. Have you tried with the github.com/bitcoin-wallet/bitcoin-wallet fellas? You could open an issue with them and describe your problem, you'd be more likely to find someone qualified and interested there. Here I'd expect you'll only find interested, not qualified :)
10 possible digits on 12 positions is 10^12 = 1 000 000 000 000 combinations. 10 possible digits on up to 12 positions is 10^12 + 10^11 + 10^10 ... 10^2 + 10^1 = 1 111 111 111 110 combinations. Bruteforcing 4 digit PIN with simple tools takes over 16 hours https://github.com/urbanadventurer/Android-PIN-Bruteforce which is why this man needs a 0day for this app or a faster, more low-level bruteforce method. It would make the most sense to extract just the encrypted file and the part of code responsible for wallet decryption. Having that enables you to build a lightweight tool that just runs that part of code against the wallet file over and over for different combinations. You could run 96 instances of that for like $90/24h on a virtual machine at any given cloud provider. You could also figure out what kind of encryption is used and optimise your code even further to make the process faster/cheaper. Plus, make the tool serverless - make a tiny package that a cloud provider will keep running parallel copies of until one finds the right PIN.
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