Mycelium Bitcoin Walletlatest release: 18.104.22.168 ( 21st January 2022 ) last analysed 24th January 2022 Reproducible when tested
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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.
The Analysis ¶
Disclaimer: Authors of this project have contributed to Mycelium.
Here we test if the latest version also can be reproduced, following the known procedure expressed in our test script:
===== Begin Results ===== appId: com.mycelium.wallet signer: b8e59d4a60b65290efb2716319e50b94e298d7a72c76c2119eb7d8d3afac302e apkVersionName: 22.214.171.124 apkVersionCode: 3130200 verdict: reproducible appHash: 0ce3ebc68ab2bff0b0876b2488c8bd7781f0b8cdf370894321fefb36234ac71a commit: 6230182c420d688dacf7885ee3dff31af29defa1 Diff: Files /tmp/fromPlay_com.mycelium.wallet_3130200/META-INF/CERT.RSA and /tmp/fromBuild_com.mycelium.wallet_3130200/META-INF/CERT.RSA differ Revision, tag (and its signature): object 6230182c420d688dacf7885ee3dff31af29defa1 type commit tag v126.96.36.199 tagger itserg 1642599297 +0300 Changelog update ===== End Results =====
which is what we want to see to give this wallet the verdict: reproducible
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.
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