Paper Wallet Generator for Ethereum

Application Description

Command line tool to create (offline) Ethereum paper wallets. Paranoic version of Matthias Zimmermann tool with cut off dependencies using ported fragments of web3j related to cryptographic functionality.

Demo Output

The output of the tool is a HTML page that can be viewed in any browser. An example output is provided below.

As we want to create paper wallets, the CSS is prepared make the HTML printable.

Run the Application

After cloning this repo build the command line tool using Maven.

mvn clean package

The result of the Maven build is an executable JAR file.

Creating a Paper Wallet

Use the following command to create a paper wallet (underlying format is BIP39).

java -jar target/epwg-0.4.0-SNAPSHOT.jar -d C:\Users\Admin\AppData\Local\Temp -p TestPassPhrase

This will lead to some information on the console

Creating wallet ...
Wallet file successfully created
Wallet pass phrase: TestPassPhrase
Wallet file location: C:\Users\Admin\AppData\Local\Temp\UTC--2017-01-14T11-34-23.830000000Z--b86bab51c139f9662ccea6547a5e34e13d144bb0.json
Writing additional output files ...
Html wallet: C:\Users\Admin\AppData\Local\Temp\UTC--2017-01-14T11-34-23.830000000Z--b86bab51c139f9662ccea6547a5e34e13d144bb0.html
Address qr code: C:\Users\Admin\AppData\Local\Temp\UTC--2017-01-14T11-34-23.830000000Z--b86bab51c139f9662ccea6547a5e34e13d144bb0.png

Three file are created by the tool as indicated in the output above

• The actual wallet file (UTC--2017-01-14T11-34-23.83... .json)
• The HTML file for printing (UTC--2017-01-14T11-34-23.83... .html)
• The image file with the QR code for the paper wallet address (UTC--2017-01-14T11-34-23.83... .png)

Verifying a (Paper) Wallet

The tool also allows to verify a provided wallet file against a provided pass phrase.

java -jar target/epwg-0.4.0-SNAPSHOT.jar -p TestPassPhrase -w  "C:\Users\Admin\AppData\Local\Temp\UTC--2017-01-14T11-34-23.830000000Z--b86bab51c139f9662ccea6547a5e34e13d144bb0.json" -v

This will lead to some information on the console

Veriying wallet file ...
Wallet file successfully verified
Wallet file: C:\Users\Admin\AppData\Local\Temp\UTC--2017-01-14T11-34-23.830000000Z--b86bab51c139f9662ccea6547a5e34e13d144bb0.json
Pass phrase: TestPassPhrase

Creating an offline Transaction

The tool further allows to create an offline EIP-1559 transaction for provided wallet details

java -jar target/epwg-0.4.0-SNAPSHOT.jar -p TestPassPhrase -w  "C:\Users\Admin\AppData\Local\Temp\UTC--2017-01-14T11-34-23.830000000Z--b86bab51c139f9662ccea6547a5e34e13d144bb0.json" -t 0x025403ff4c543c660423543a9c5a3cc2a02e2f1f -a 0.0123

leading to the following output.

Target address:     0x025403ff4c543c660423543a9c5a3cc2a02e2f1f
Amount [Ether]:     0.0123
Nonce:              0
Gas limit [Wei]:    21000
Max prio fee [Wei]: 3000000000
Max fee [Wei]:      185000000000
Transaction body: 0xf86b808504a817c80082520894025403ff4c543c660423543a9c5a3cc2a02e2f1f872bb2c8eabcc000801ba08c5b25a10edb8e72518f4e6f51527df718d090f80cefcf024669340fe29cf78aa0124a95546dc897b6987c2b05efd2be7ed976318174a6bf9300d6f11c1d5d2da1

The last line may be used to send the transaction to the Etherem network (via https://etherscan.io/pushTx).

Dependencies

The project is developed using Java 8. Building the project is done with Maven. To create QR codes the ZXing library is used. To handle json conversions the Jackson library is used. To support cryptography the Bouncy Castle library is used. Most of the crypto functionality implemented using ported fragments of web3j