Do your own research!
Try out searching for "lost bitcoins", "stole my money" or "scammers" together with the wallet's name, even if you think the wallet is generally trustworthy. For all the bigger wallets you will find accusations. Make sure you understand why they were made and if you are comfortable with the provider's reaction.
The Analysis ¶
This analysis is based on this issue by Emanuel.
This app is a fork of the currently reproducibleand supports Bitcoin with the same timelock-and-multisig setup as Green.
Altana is based on services offered by GreenAddress.
sounds like the app doesn’t come with their own servers but relies on Blockstream’s servers.
“Their website” has only a small section on the wallet which basically links back to Google Play for details and a code repository is nowhere to be found. But I think Emanuel found this wallet the other way around, by searching GitHub for Bitcoin wallets and so he shared this repo
Emanuel also managed to build the wallet but with plenty of differences to the version from Google Play. Until those are resolved, the app is not verifiable. Check the issue for details.
We could not verify that the provided code matches the binary!
As part of our Methodology, we ask:Is the published binary matching the published source code? If not, we tag it
Published code doesn’t help much if it is not what the published app was built from. That is why we try to reproduce the binary. We
- obtain the binary from the provider
- compile the published source code using the published build instructions into a binary
- compare the two binaries
- we might spend some time working around issues that are easy to work around
If this fails, we might search if other revisions match or if we can deduct the source of the mismatch but generally consider it on the provider to provide the correct source code and build instructions to reproduce the build, so we usually open a ticket in their code repository.
In any case, the result is a discrepancy between the app we can create and the app we can find on the app store and any discrepancy might leak your backup to the server on purpose or by accident.
As we cannot verify that the source provided is the source the app was compiled from, this category is only slightly better than closed source but for now we have hope projects come around and fix verifiability issues.
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