An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu

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description: Some use cases of creating transactions on a Pantheon network

Creating and Sending Transactions

You can send signed transactions using the eth_sendRawTransaction JSON-RPC API method.

Signed transactions can be simple value transfers, contract creation, or contract invocation.

Example scripts are provided to create a signed raw transaction that can be passed to eth_sendRawTransaction to send Ether and create a smart contract.

!!! warning "Private keys"

Do not use the accounts in the examples on mainnet or any public network except for testing.
The private keys are displayed which means the accounts are not secure.

All accounts and private keys in the examples are from the `dev.json` genesis file in the 
[`/pantheon/ethereum/core/src/main/resources`](https://github.com/PegaSysEng/pantheon/tree/master/config/src/main/resources) directory.

In production environments avoid exposing your private keys by creating signed transactions 
offline, or use [EthSigner](https://docs.ethsigner.pegasys.tech/) to isolate your private keys and 
sign transactions with [`eth_sendTransaction`](https://docs.ethsigner.pegasys.tech/Using-EthSigner/Using-EthSigner/#eth_sendtransaction).

!!! tip Libraries such as web3j or ethereumj and tools such as MyCrypto can also be used to create signed transactions.

You can use the example Javascript scripts to create and send raw transactions in the private network created by the Private Network Quickstart.

Update the JSON-RPC endpoint in the following examples to the endpoint for the private network displayed after running the ./run.sh script.

Example Javascript scripts

1. Requirements

Node.js (version > 10)
web3.js 1.0.0 beta and ethereumjs 1.3. These dependencies are defined in the included package.json file.

2. Create Directory

mkdir example_scripts

3. Copy Files

Copy the following files to the example_scripts directory:

4. Retrieve Dependencies

cd example_scripts
npm install

5. Send Ether

The following is the example JavaScript script that displays a signed raw transaction string to send Ether.

!!! example "Send Ether example : create_value_raw_transaction.js" ```javascript linenums="1" {! Using-Pantheon/Transactions/scripts/create_value_raw_transaction.js !}

```

Run the create_value_raw_transaction.js script:

node create_value_raw_transaction.js <YOUR JSON-RPC HTTP ENDPOINT>

node create_value_raw_transaction.js http://localhost:32770/jsonrpc

!!! tip The default JSON-RPC HTTP endpoint for create_value_raw_transaction.js is http://localhost:8545. If using http://localhost:8545, run node create_value_raw_transaction.js.

A signed raw transaction string is displayed.

You can send the raw transaction yourself or let the script send it using the web3.js library.

If sending it yourself, the cURL command is displayed and can be copied and pasted. Otherwise, the script sends it and the transaction receipt is displayed.

6. Create A Smart Contract

The following is the example JavaScript script that displays a signed raw transaction string to create a contract.

!!! example "Create a contract example : create_contract_raw_transaction.js"
```javascript linenums="1" {! Using-Pantheon/Transactions/scripts/create_contract_raw_transaction.js !}

```

Run the create_contract_raw_transaction.js script:

node create_contract_raw_transaction.js <YOUR JSON-RPC HTTP ENDPOINT>

node create_contract_raw_transaction.js http://localhost:32770/jsonrpc

!!! tip The default JSON-RPC HTTP endpoint for create_contract_raw_transaction.js is http://localhost:8545. If using http://localhost:8545, run node create_contract_raw_transaction.js.