# Token Transfer between Ethereum and Solana using Wormhole SDK

This project demonstrates how to bridge tokens from Ethereum to Solana using the Wormhole SDK. The process involves initializing signers for both chains, initiating a transfer on the source chain (Ethereum), waiting for an attestation, and then completing the transfer on the destination chain (Solana).

## Setup

Before running the project, ensure that you have the following:

1. **Node.js** (version >= 14.x)
2. **Wormhole SDK** installed via npm
3. Environment variables set for private keys

## Installation

1. Clone the repository:

```bash
git clone <repository-url>
cd <project-folder>

2. Install dependencies:

npm install

3. Create a .env file in the root of the project and add your private keys for Ethereum and Solana:

SOL_PRIVATE_KEY=<your-solana-private-key>
ETH_PRIVATE_KEY=<your-ethereum-private-key>

Code Walkthrough

Main Script (wormhole.js)

The code demonstrates a simple token transfer between Ethereum and Solana using the Wormhole SDK.

1. Environment Variables: The private keys for Solana and Ethereum are fetched from environment variables using the dotenv package.

2. Signer Setup: The getSigner function initializes the appropriate signer based on the blockchain platform (Ethereum or Solana) by utilizing the evm and solana modules from the Wormhole SDK.

3. Wormhole Initialization: The Wormhole object is initialized with the Testnet environment and supported chains (Ethereum and Solana).

4. Token Transfer: A transfer is initiated from Ethereum to Solana. The amount to transfer is specified in the smallest unit (e.g., Wei for Ethereum), and the transfer is either automatic or manual.

5. Attestation: If the transfer is manual, the program waits for an attestation (VAA) before completing the transfer.

6. Completion: After the attestation is confirmed (if applicable), the transfer is completed on the destination chain (Solana).

Helper Functions

• getEnv: Fetches environment variables, throwing an error if the key is missing.
• getSigner: Sets up the signer for Ethereum or Solana depending on the chain being used.

Running the Script

1. Ensure that your .env file is correctly configured with your private keys.
2. Run the script:

node wormhole.js

This will initiate a token transfer from Ethereum to Solana. The script will log the progress, including the creation of the transfer object, initiation of the transfer, and the completion status.

Example Output

executing bridge
executing signer
Transfer object created: <TransferObject>
Starting Transfer
Started Transfer: <TxId>
Waiting for Attestation
Got Attestation: <AttestationId>
Completing Transfer
Completed Transfer: <TxId>
Transfer status: <TransferStatus>

Error Handling

• Ensure that both the Ethereum and Solana wallets are funded and connected properly.
• If you encounter issues, check that the private keys are correctly set in the .env file.
• Any unsupported blockchain platforms will trigger an error during the signer setup.

Notes

• The example assumes you are using Ethereum and Solana Testnets.
• The transfer amount is set in the smallest unit (e.g., Wei or Lamports), so make sure to adjust the token decimals as per your specific token.

License

This project is licensed under the MIT License. See the LICENSE file for details.