Send Message from Cosmos to EVM

This project demonstrates how to send a message from Osmosis to Avalanche.

Prerequisites

1. Install osmosisd CLI

Download and install the osmosisd CLI by following the instructions here.

If the installation wizard does not work, build from source using the following commands:

git clone https://github.com/osmosis-labs/osmosis.git
cd osmosis
make build

2. Create a Wallet

If you don't have a wallet yet, create one using the following command:

osmosisd keys add wallet

3. Obtain Test Tokens

Get some test tokens from the Osmosis Testnet Faucet: Osmosis Testnet Faucet

Deploy the Contract

1. Build the Contract

Navigate to the wasm folder and build the contract using Docker:

docker run --rm -v "$(pwd)":/code \
  --mount type=volume,source="$(basename "$(pwd)")_cache",target=/code/target \
  --mount type=volume,source=registry_cache,target=/usr/local/cargo/registry \
  cosmwasm/rust-optimizer:0.12.13

2. Upload and Initialize the Contract

Upload the Contract

Use the following command to upload the contract:

osmosisd tx wasm store ./artifacts/send_receive.wasm --from wallet --gas-prices 0.4uosmo --gas auto --gas-adjustment 1.5 -y -b sync --output json --node <https://rpc.osmotest5.osmosis.zone:443> --chain-id osmo-test-5

Instantiate the Contract

Instantiate the contract with this command:

osmosisd tx wasm instantiate <codeId> '{"channel":"channel-4118"}' --from wallet --label "send_receive" --gas-prices 0.1uosmo --gas auto --gas-adjustment 1.3 --no-admin -y -b sync --output json --node <https://rpc.osmotest5.osmosis.zone:443> --chain-id osmo-test-5

Replace <codeId> with the actual code ID of your transaction. To find the code ID, check Mintscan and replace <codeId> accordingly.

3. Create .env File

Navigate to the root folder and create a .env file:

touch .env

Add the private key of your EVM address to the .env file:

PRIVATE_KEY="your private key"

4. Run the Script to send message to Avalanche

Run the script using the following command:

node index.js

5. Read a message from a CosmWasm contract on Osmosis

Run the script using the following command:

node read.js

Useful Resources

• Osmosis Testnet Faucet
• Osmosis Testnet Explorer

Notes

• Ensure you have Docker installed for building the contract.
• Replace placeholder values (e.g., <codeId>, "your private key") with actual values specific to your setup.
• For any issues during the deployment or execution, refer to the official documentation or community forums for support.