Blockstream Green - A native bitcoin wallet for Android

What is Blockstream Green?

Blockstream Green is a non-custodial Bitcoin wallet - it allows you to safely store, send, and receive your Bitcoin.

It's a mobile app available for Android and iOS, based on gdk, our cross-platform wallet library.

We offer a variety of advanced features, such as letting our users set their own spending limits, watch-only access for observers, and our unique multisig security model. All of these (and more) are explained in more detail here.

Build

For instructions on how to build Blockstream Green please refer to BUILD.md

Contributing

Guidelines for contributions can be found in CONTRIBUTING.md

Translations

You can help translating this app here

Support

Need help?

Read our FAQ or contact us at info@greenaddress.it.

License

Blockstream Green is released under the terms of the GNU General Public License. See LICENSE for more information or see https://opensource.org/licenses/GPL-3.0

Authenticity

Verifying the APK signing certificate fingerprint is very important for you own security - please follow this steps to make sure the APK you've downloaded is authentic.

Unzip the APK and extract the file /META-INF/GREENADD_.RSA; then run:

keytool -printcert -file GREENADD.RSA

You will get the certificate fingerprints; verify it matches with:

Certificate fingerprints:
	 MD5:  60:D0:C6:E1:B7:8B:5F:E7:E1:94:B6:B8:7D:54:D0:73
	 SHA1: 7F:05:E3:DC:29:CB:E6:76:F5:0A:56:A2:80:1A:FD:37:91:96:8F:7A
	 SHA256: 32:F9:CC:00:B1:3F:BE:AC:E5:1E:2F:B5:1D:F4:82:04:4E:42:AD:34:A9:BD:91:2F:17:9F:ED:B1:6A:42:97:0E
	 Signature algorithm name: SHA256withRSA
	 Version: 3

Now download the list of cryptographic checksums: SHA256SUMS.asc

Verify that the checksum of the release file is listed in the checksums file using the following command:

shasum -a 256 --check SHA256SUMS.asc

In the output produced by the above command, you must ensure the output lists "OK" after the name of the release file you downloaded.

Now import our GPG key:

04BE BF2E 35A2 AF2F FDF1  FA5D E7F0 54AA 2E76 E792

Verify that the checksums file is PGP signed by our key:

gpg --verify SHA256SUMS.asc

Check the output from the above command for the following text:

A line that starts with: gpg: Good signature

A complete line saying: Primary key fingerprint: 04BE BF2E 35A2 AF2F FDF1 FA5D E7F0 54AA 2E76 E792

Acknowledgements

Thanks to Bitcoin Wallet for Android for their QR scanning activity source code!

dabitdev/green_android