Chapter 1: scryptlib

Congratulations! You've built your very first Bitcoin SV smart contract using sCrypt. Now, you will learn how to implement your contract into your Web3/dAPP application using Javascript. We are assuming that you have some basic knowledge of the front-end development.

The webapp branch of the React App project tic-tac-toe contains a tic-tac-toe game with only front-end code. We will start from this branch and implement a contract version of tic-tac-toe game step by step.


scryptlib is sCrypt's official Javascript SDK for integrating Bitcoin SV Smart Contract in your application. It is designed to help you quickly build a high-quality Smart Contract applications. You will be able to compile, test, deploy and call contracts through this SDK.


scryptlib can be installed via npm.

// use NPM npm install scryptlib // use Yarn yarn add scryptlib


Here's how to instantiate Tic-Tac-Toe Smart Contract and call its public methods. Just like regular Javascript objects, you can simply compile new contract class Tictactoe, instantiate new object named game using the class, and call the function called move.

const Demo = buildContractClass(compileContract('demo.scrypt')); const demo = new Demo(7, 4); const result = demo.add(11).verify() assert(result.success);

Put it to the test

Clone the React App project tic-tac-toe. and switch to the webapp branch.