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Mycelium Bitcoin Wallet

latest release: last analysed  9th July 2021 Reproducible when tested  
4.2 ★★★★★
10874 ratings
1st July 2013

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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 

Disclaimer: The authors of this project have contributed to Mycelium.

Independent re-builds:

Here we test if the latest version also can be reproduced, following the known procedure expressed in our test script:

appId:          com.mycelium.wallet
signer:         b8e59d4a60b65290efb2716319e50b94e298d7a72c76c2119eb7d8d3afac302e
apkVersionCode: 3100003
appHash:        7532f6d0cef440cfc3a09d48d8ef099a96c093f9895ad21aa069aa60be43a06d

Files /tmp/fromPlay_com.mycelium.wallet_3100003/META-INF/CERT.RSA and /tmp/fromBuild_com.mycelium.wallet_3100003/META-INF/CERT.RSA differ

Revision, tag (and its signature):
object e0098cde4babb860bb29c0aa613795240de6aa6b
type commit
tag v3.10.0.3
tagger itserg <sergey.dolgopolov@mycelium.com> 1625235171 +0300

SSL certificate fix for older devices

which is what we want to see to give this wallet the verdict: reproducible


Verdict Explained

The binary provided was reproducible from the code provided.

As part of our Methodology, we ask:

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

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

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.

“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.