👨‍🔬 Labcoat ⚛

Labcoat is a development toolkit for Bitcoin Alkanes smart contracts. It provides a Hardhat-style experience for compiling, deploying, and testing Alkanes contracts.

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Features

• Compile Alkanes contracts (.rs) to WebAssembly (.wasm)
• Generate ABI from Rust contracts automatically
• Deploy contracts to Bitcoin networks using @oyl/sdk

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Installation

First, create a new directory for your project:

mkdir labcoat-example
cd labcoat-example

Once that's done, initialize your Labcoat project by running:

npx @jonatns/labcoat init

Then install the required dependencies:

npm i

Project structure

labcoat.config.ts

contracts
├── Example.rs
├── Storage.rs

deployments
├── manifest.json

scripts
└── example.ts
└── storage.ts

Writing a smart contract

Writing a smart contract with Labcoat is as easy as writing a Rust file inside the contracts directory. For example, your contracts/Example.rs should look like this:

use alkanes_runtime::{declare_alkane, message::MessageDispatch, runtime::AlkaneResponder};
use alkanes_support::response::CallResponse;
use anyhow::Result;
use metashrew_support::compat::to_arraybuffer_layout;

#[derive(Default)]
pub struct ExampleContract(());

#[derive(MessageDispatch)]
enum ExampleContractMessage {
    #[opcode(0)]
    Initialize,

    #[opcode(1)]
    #[returns(String)]
    Greet { name: String },
}

impl ExampleContract {
    fn initialize(&self) -> Result<CallResponse> {
        let context = self.context()?;
        let response = CallResponse::forward(&context.incoming_alkanes);
        Ok(response)
    }

    fn greet(&self, name: String) -> Result<CallResponse> {
        let context = self.context()?;
        let mut response = CallResponse::forward(&context.incoming_alkanes);

        let message = format!("Hello {}!", name);
        response.data = message.as_bytes().to_vec();

        Ok(response)
    }
}

impl AlkaneResponder for ExampleContract {}

declare_alkane! {
    impl AlkaneResponder for ExampleContract {
        type Message = ExampleContractMessage;
    }
}

Then all you need to do is run:

npx labcoat compile contracts/Example.rs

Deploying contracts

A script in Labcoat is just a TypeScript file with access to your contracts, configuration, and any other functionality that Labcoat provides. You can use them to run deploy scripts or custom logic like simulations and executions.

Writing a Labcoat script (scripts/example.ts):

import { labcoat } from "@jonatns/labcoat";

export default async function main() {
  const { deploy, simulate } = await labcoat.setup();

  await deploy("Example");

  const result = await simulate("Example", "Greet", ["World"]);
  console.log("📦 Result:", result);
}

main()
  .then(() => process.exit(0))
  .catch((err) => {
    console.error("❌", err);
    process.exit(1);
  });

Setting up a wallet:

Before deploying to the Bitcoin network you will need to setup a mnemonic in .env which is used by labcoat.config.ts. By default it uses the oylnet network:

export default {
  network: "oylnet",
  mnemonic: process.env.MNEMONIC,
};

Once that's done run the example script by using our generic run command:

npx labcoat run scripts/example.ts

The example script will deploy and simulate a function call against the Example contract. The Tx ID and Alkane ID will be stored in deployments/manifest.json for future use.