Coin Wallet: Buy BitcoinGoogle Play
Our wallet review process
We examine wallets starting at the code level and continue all the way up to the finished app that lives on your device. Provided below is an outline of each of these steps along with security tips for you and general test results.
Application build test result
Update 2023-04-22: Emanuel
made progress with this product
and succeeded to compile and almost reproduce version
v5.10.0. He claims there
were only file names that differed and implied that contents did match except
for again those file names.
He used this container:
FROM docker.io/node:16-bullseye-slim RUN set -ex; \ apt-get update; \ DEBIAN_FRONTEND=noninteractive apt-get install --yes -o APT::Install-Suggests=false --no-install-recommends \ git \ wget \ unzip \ openjdk-11-jdk-headless; \ rm -rf /var/lib/apt/lists/*; \ useradd -ms /bin/bash appuser; USER appuser ENV ANDROID_SDK_ROOT="/home/appuser/sdk" \ ANDROID_HOME="/home/appuser/sdk" \ JAVA_HOME="/usr/lib/jvm/java-11-openjdk-amd64/" \ PATH="/home/appuser/gradle-6.9.4/bin:/home/appuser/sdk/build-tools/32.0.0/:$PATH" \ NODE_ENV="development" \ MOONPAY_API_KEY="pk_live_Tdc0BhIo7uIk8v9MOtWNxVJHr1WCEm" \ SENTRY_DSN="https://firstname.lastname@example.org/5131667" \ SENTRY_ORG="dummy_string_just_need_to_be_set_to_anything" \ SENTRY_AUTH_TOKEN="dummy_string_just_need_to_be_set_to_anything" \ CHANGELLY_REF="1c6e7ce0484f" \ COMMIT="5af422a" \ COMMIT_SHA="5af422a" \ ORG_GRADLE_PROJECT_cdvVersionCode=3154 \ GITHUB_RUN_NUMBER=624 \ ZENDESK_APP_ID="4acba684eddd4f67b514c05ce516d2b9d34fa284cecaed49" \ ZENDESK_URL="https://coinapp.zendesk.com" \ ZENDESK_CLIENT_ID="mobile_sdk_client_f5b0609f735ecf230d0c" RUN set -ex; \ cd /home/appuser/; \ git clone --single-branch --no-tags --depth 1 --branch v5.10.0 https://github.com/CoinSpace/CoinSpace/; \ mkdir -p "/home/appuser/sdk/licenses" ; \ printf "\n24333f8a63b6825ea9c5514f83c2829b004d1fee" > "/home/appuser/sdk/licenses/android-sdk-license"; \ wget https://services.gradle.org/distributions/gradle-6.9.4-bin.zip; \ unzip gradle-6.9.4-bin.zip -d /home/appuser/; \ rm gradle-6.9.4-bin.zip; \ wget https://dl.google.com/android/repository/commandlinetools-linux-9477386_latest.zip; \ unzip commandlinetools-linux-9477386_latest.zip -d /home/appuser/sdk/; \ rm commandlinetools-linux-9477386_latest.zip; \ /home/appuser/sdk/cmdline-tools/bin/sdkmanager --sdk_root=/home/appuser/sdk/ --install "build-tools;32.0.0"; \ cd /home/appuser/CoinSpace/; \ npm config set @coinspace:registry https://npm.pkg.github.com; \ npm config set "//npm.pkg.github.com/:_authToken" "ghp_github_token_only_read_packages_scope"; \ npm ci; \ cd /home/appuser/CoinSpace/phonegap; \ npm ci; \ cd /home/appuser/CoinSpace; \ node ./cli/i18n.js --json; \ cd /home/appuser/; \ keytool -genkey -alias coinspace -keystore /home/appuser/CoinSpace/phonegap/release.keystore -storetype PKCS12 -keyalg RSA -keysize 4096 -storepass coinspace -keypass coinspace -validity 10000 -dname CN=IL; \ cd /home/appuser/CoinSpace; \ /home/appuser/CoinSpace/phonegap/node_modules/.bin/cordova telemetry off; ENV NODE_ENV="production" WORKDIR /home/appuser/CoinSpace
in which he ran
node ./cli/build.js phonegap --env=prod --release --platform=android-play.
Update: The provider closed the issue about reproducibility, so we do not assume this app to be reproducible any time soon.
Coin Bitcoin Wallet at least implies to be non-custodial with this feature:
Secure passphrase generation (your master private key), no one else can access your Coin.Space wallet.
but other features do not sound that promising:
Get started in seconds and access your wallet from any device: app or web.
They also claim
Over 20 million Wallets users.
and are around since early 2015, so we are hopeful to find more solid information on their website because in the Playstore description there is no word about source code.
There we again see strong claims about this wallet not being custodial:
Coin does not hold your keys for you. We cannot access accounts, recover keys, reset passphrase, nor reverse transactions. Protect your keys & always check that you are on correct URL. You are responsible for your security.
But nowhere on the website is a link to a source code repository.
Searching GitHub for their applicationId
com.coinspace.app we find two
repositories, with one looking
promising: One of the latest commits is tagged
v2.16.3 which is
exactly the version we see on Google Play.
Unfortunately there is nothing in terms of build instructions. Given there are two open issues, issue 14 and issue 17 asking about how to make this work, not specifically asking about Android but seeing these issues remaining unresolved in a year and almost two years I will postpone this analysis and conclude for now that this wallet is not verifiable.
Update: The developer replied to our request to resolve the issues we had but he closed the issue commenting:
Perhaps, it didn’t match because we don’t publish here our private parameters which we use for build. But you can be sure that our tags match App on Google Play store.
which was not our issue.
We are tempted to just try stuff with the Docker file there but our mission statement is that it should be easily reproducible which definitely includes not having to guess and so we remain until further notice with our prior verdict: not verifiable.
Tests performed by Leo Wandersleb
Previous application build tests
|16th December 2019||v2.16.3|
Do your own research
In addition to reading our analysis, it is important to do your own checks. Before transferring any bitcoin to your wallet, look up reviews for the wallet you want to use. They should be easy to find. If they aren't, that itself is a reason to be extra careful.