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Zap: Bitcoin Lightning Wallet

latest release: Varies with device ( 3rd October 2021 ) last analysed  17th September 2021 Reproducible when tested 
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Disclaimer

The following Analysis is not a full code review! We plan to make code reviews available in the future but even then it will never be a stamp of approval but rather a list of incidents and questionable coding practice. Nasa sends probes to space that crash due to software bugs despite a huge budget and stringent scrutiny.

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.

If you find something we should include, you can create an issue or edit this analysis yourself and create a merge request for your changes.

The Analysis 

Here is the output using our test script on the binary from Google Play:

Results:
appId:          zapsolutions.zap
signer:         24a0e944a65d8cea692653e1a132a042c37be334f1b0b4200575fee6f46eca86
apkVersionName: 0.5.1-beta
apkVersionCode: 3031
verdict:        reproducible
appHash:        dbf21e0cfb7f0bc238e9f24e123777f12e497ad574ada282a82e5dd98fa98d47
commit:         3255dc080065bcc3c82a59effba18e51b570f98e

Diff:
Only in /tmp/fromPlay_zapsolutions.zap_3031/META-INF: CERT.RSA
Only in /tmp/fromPlay_zapsolutions.zap_3031/META-INF: CERT.SF
Only in /tmp/fromPlay_zapsolutions.zap_3031/META-INF: MANIFEST.MF

That’s how it should look like to give it the verdict: reproducible.

About the app

This app is a remote control for lnd, the lightning network daemon. As such it is not exactly a wallet in the sense of many other wallets here as the lnd connected to, also has control over the funds but in a setup where you connect to your own lnd, Zap gets into the position of being able to steal your funds. If you have strong objections with the classification as a wallet, please open an issue on our GitLab.

(lw)

Verdict Explained

The binary provided was reproducible from the code provided.

As part of our Methodology, we ask:

Does the binary we built differ from what we downloaded? If not, we tag it Reproducible 

If we can reproduce the binary we downloaded from the public source code, with all bytes accounted for, we call the product reproducible. This does not mean we audited the code but it’s the precondition to make sure the public code has relevance for the provided binary.

If the provider puts your funds at risk on purpose or by accident, security researchers can see this if they care to look. It also means that inside the company, engineers can verify that the release manager is releasing the product based on code known to all engineers on the team. A scammer would have to work under the potential eyes of security researchers. He would have to take more effort in hiding any exploit.

“Reproducible” does not mean “verified”. There is good reason to believe that security researchers as of today would not detect very blatant backdoors in the public source code before it gets exploited, much less if the attacker takes moderate efforts to hide it. This is especially true for less popular projects.