Simple Bitcoin Wallet (aka SBW) is a non-custodial Bitcoin wallet for Android.

Building from source

git clone https://github.com/btcontract/wallet.git
cd wallet
git checkout 2.5.9
podman build -t sbw .
podman run -v $PWD:/app/simplebitcoinwallet/wallet:z sbw

Signing with your self-signed certificate

Install Android SDK, create a keystore.jks using keytool.

$ <Android SDK dir>/build-tools/<version>/zipalign -v 4 app/build/outputs/apk/release/SBW-2.5.9.apk app/build/outputs/apk/release/SBW-2.5.9-aligned.apk

$ <Android SDK dir>/build-tools/<version>/apksigner sign --ks <path to keystore.jks> --ks-key-alias <signing key alias> --v1-signing-enabled true --v2-signing-enabled true app/build/outputs/apk/release/SBW-2.5.9-aligned.apk

Verification with apksigner

$ '<Android SDK dir>/build-tools/<version>/apksigner' verify --print-certs --verbose SBW-2.5.9.apk

Output should contain the following info:

Verifies
Verified using v1 scheme (JAR signing): true
Verified using v2 scheme (APK Signature Scheme v2): true
Number of signers: 1
Signer #1 certificate DN: CN=Bitcoins wallet developer
Signer #1 certificate SHA-256 digest: dca2c3527ec7f7c0e38c0353278e7a5674cfa6e4b7556510ff05f60073ca338a
Signer #1 certificate SHA-1 digest: 14659e7de5a71f2608bf4a889c0f8d043147e203
Signer #1 certificate MD5 digest: e3102232a4754705c8917710765b9635
Signer #1 key algorithm: RSA
Signer #1 key size (bits): 2048
Signer #1 public key SHA-256 digest: dc97f0f2e34167015914600d8fa748f908d578bcedb79664d010de3c9bdebf13
Signer #1 public key SHA-1 digest: c4400469d5ad807dd9394785f1fa95003588a091
Signer #1 public key MD5 digest: e4e1f847e0cb0a9703dc4f9323fd6d87

Contributing

PRs are not welcome, this code is only made public to make it possible to inspect and verify it. Third party PRs will most likely be rejected so please don't waste your time on them.