Command line tool for offline template-based transaction signing.
If you like this tool, please consider a donation at:
0x0c56073db91c2Ba57FF362301eb32262BBeE6147
Download the latest ZIP from: https://www.e-contract.be/maven2/be/e-contract/ethereum-tool/
Install (Mac OS X, Linux, or FreeBSD) via:
sudo unzip -o ethereum-tool-1.0.7.zip -d /usr/local/
Run the tool via:
ethereum-tool
Reboot your machine using a Linux Live USB stick so you work in a clean and secure environment.
The password command might give you some inspiration for a strong password.
ethereum-tool password
Create a new key and corresponding transaction template via:
ethereum-tool createkey -d keystore -t templates
The keystore directory will contain the new key.
The templates directory will contain the corresponding transaction template.
Store the key in a save way (e.g., multiple USB keys or so). The transaction template can be used to prepare transactions to be signed.
Verify the key via:
ethereum-tool verifykey -f keystore/UTC--...
You can also create a transaction template from an existing key via:
ethereum-tool verifykey -f keystore/UTC--... -t templates
Preparing a transaction requires an online machine.
Copy the transaction template to a transaction.json file to prepare a new transaction.
You need to change some fields within the transaction.json file.
First of all the nonce need to be set correct. Retrieve the correct nonce of your address via:
ethereum-tool nonce -l http://localhost:8545 -a your_address_here
This of course requires a running and synched Ethereum node.
You also might want to adjust the gas price. Query the current gas price (as reported by your local node) via:
ethereum-tool gasprice -l http://localhost:8545
Notice that this might not be the sharpest gas price possible. Check out the network speed to see the currently used gas prices:
ethereum-tool speed -l http://localhost:8545
After the transaction JSON file has been prepared we boot again via our Linux Live USB to have a clean and secure environment.
Sign the transaction via:
ethereum-tool sign -f keystore/UTC--... -t transaction.json -o transaction
Inspect the signed transaction via:
ethereum-tool inspect -f transaction
This requires an online machine of course.
Transmit the transaction to the network via:
ethereum-tool transmit -l http://localhost:8545 -f transaction
Check the status of the transaction via:
ethereum-tool confirm -l http://localhost:8545 -f transaction
Build the project via Maven:
mvn clean install
We use Netbeans as IDE. If you send pull requests, please keep the code clean to ease the review process.