This app was first launched on 1st July 2013 and currently has more than 1000000 downloads, a 4.1 stars rating from 7697 users and the latest APK (version 22.214.171.124) was from 13th February 2020.
We found these ways of contacting the developers:
- Review of version 126.96.36.199 on 16th February 2020 (verdict: nonverifiable)
- Review of version 188.8.131.52 on 7th January 2020 (verdict: verifiable)
- Review of version 184.108.40.206 on 16th November 2019 (verdict: verifiable)
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 bad coding practice. We cannot find and tell you all the dark secrets the wallet providers might have.
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.
Disclaimer: The authors of this project have contributed to Mycelium. Andreas Schildbach was so kind and independently tested and confirmed Mycelium’s verifiability here for a past version. Independent tests would be highly welcome!
Here we test if version
220.127.116.11 also can be verified, following the known
procedure expressed in our
Results for appId: com.mycelium.wallet apkVersionName: "18.104.22.168" apkHash: 6549d022684cac8521ff4c97cdd205ef289c58b58a589e092f1a5439aaf06a59 Diff: Files /tmp/fromPlay_com.mycelium.wallet_3030101/original/META-INF/CERT.RSA and /tmp/fromBuild_com.mycelium.wallet_3030101/original/META-INF/CERT.RSA differ Files /tmp/fromPlay_com.mycelium.wallet_3030101/original/META-INF/CERT.SF and /tmp/fromBuild_com.mycelium.wallet_3030101/original/META-INF/CERT.SF differ Files /tmp/fromPlay_com.mycelium.wallet_3030101/original/META-INF/MANIFEST.MF and /tmp/fromBuild_com.mycelium.wallet_3030101/original/META-INF/MANIFEST.MF differ
This diff is what we want to see to call it verifiable.
The last verdict was nonverifiable due to lacking compile instructions. Those were fixed with this commit.
Verifiable: The provided Open Source Code matches the app released on Google Play
The app can be independently verified. 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 app 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.
"Verifiable" does not mean "verified". There is good reason to believe that security researchers as of today would not detect very blatant backdoors in the open source code before it gets exploited, much less if the attacker takes moderate efforts to hide it.