How to Create a Smart Contract on Klaytn?

Currently, existing smart contracts in Klaytn are programs that qualitatively implement games, libraries, business logic, token transfer, or any code that interacts with the Klaytn blockchain. The Klaytn team provides a quality development experience so Ethereum DApp developers can easily port their existing smart contracts to Klaytn and experiment.

In the future, Klaytn will support writing smart contracts using other programming languages. However, Klaytn smart contracts hold great promise. 

Klaytn smart contract

Klaytn is designed to be a fundamental layer of trust for the metaverse, respecting the contributions and participation of all communities and empowering and connecting them in a new world. Moreover, it’s a great way for beginners to organize the special community in a scalable way and make it as easy as possible to build applications.

Klaytn supports one of the most popular programming languages, Solidity, and guarantees compatibility with Ethereum development tools such as Truffle or Remix. Solidity is the standard contract programming language in Ethereum and is supported by various cryptocurrency communities. 

Klaytn provides developers with a clear development environment into which Ethereum DApp developers can easily migrate all their work. In addition, Klaytn includes community types such as investment DAOs, gaming guilds, DAO communities, etc. Klaytn was created to meet such requirements:

High Performance

Klaytn is distinguished by such characteristics as Scalability, Finality, and Throughput (TPS), which makes it very promising.

• Finality and Throughput (TPS). The key chain processes at least 4,000 transactions per second and guarantees users instant transaction completion with one second block generation time.
• Scalability. The provided service chain is an L2 solution for Klaytn 2.0 and can be easily deployed or configured. The service chain can connect to the main chain for asset transfer or pegging and managing it. 

Large networks or Enterprises generally want to have their dedicated runtime environment. Thanks to this service chain, they can maintain a high-performance isolated execution environment that is not affected by other blockchain applications.

Low gas costs

Users should not be burdened with higher transaction fees beyond those required by traditional systems.

The transaction fee should be determined by the transaction’s complexity, not by related factors, and should be as stable as possible. For example, with a gas price of 250 tons, transferring KLAY would entail a fixed cost of 0.00525 KLAY. Therefore, it is a great option for those who do not want to overpay.

Rapid Development

Any development tools that can run on Ethereum will work seamlessly within the Klaytn ecosystem, making the Klaytn tech stack equivalent to the Ethereum stack.

Also, you should pay attention to infrastructure and open-source packages. End-to-end integration and blockchain-building toolkits include: SDKs and wallets and chain explorers, Smart contract libraries, Oracle support and bridges, and distributed storage solutions. 

The secondary infrastructure is an ecosystem for supporting services and products and includes abstraction/integration services, DAO, stablecoin integration, DEX, NFT, DeFi marketplaces, and traditional financial interfaces. ​

In this decentralized network, no malicious node can violate the integrity of the data. 

Creating of Klaytn smart contract

First, a smart contract deployment takes place on the local network. The smart contract is then deployed on the Klaytn testnet.

• Overview: Installation of the tools. First, you need to get some tools. First, install git and check the version using the get –version. Then you should install docker and check if it works well. Then you must install Node v10.21.0 or higher and check the resulting version using node –version. After that, install Jq, etc., and from now on, your laptop will be 100% ready for development.
• Klaytn sandbox. It is a special boilerplate code that helps you start building Dapps. It uses the Truffle platform to deploy, compile, and test smart contracts. You should clone the sandbox repository and install the libraries. Open the klaytn-dev-sandbox folder. Then, examine the folder structure in your editor: the Contracts folder, the network folder, the migration folder, and so on. Download the local network KlaytnFor development, you need an environment where you can deploy smart contracts. You can quickly deploy a Klaytn LAN using the following command. npm run run:klaytnIf you would like to see the execution logs, you should run npm run run:klaytn:logTo terminate the network, you need to run npm run run:klaytn:terminateIf you want to remove log files, you should run npm run run:klaytn:cleanlog
• Download the local network Klaytn. For development, you need an environment where you can deploy smart contracts. You can quickly deploy a Klaytn LAN using the following command. npm run run:klaytnIf you would like to see the execution logs, you should run npm run run:klaytn:logTo terminate the network, you need to run npm run run:klaytn:terminateIf you want to remove log files, you should run npm run run:klaytn:cleanlog

Let’s create the contract

Below are the usual smart contracts for creating non-fungible and fungible tokens. You can easily write smart contracts in the contracts folder.

KlaytnGreeter is a contract that returns a Greeting message. This message is set when the contract will be deployed.

Save this code in a KlaytnGreeter.sol file.

Deploying of smart contract on the local network

The Migrations directory contains all deployment scripts. By default, token contracts have these deployment scenarios.

1. First, add a deployment script for the created smart contract. The above code will compile and deploy the contract on a dedicated LAN and store the abi, and the deployed address in the special src folder for later use. After some necessary actions, save the deployed abi to the greeterABI file in the src folder. Then you should copy the above code and save it as 5_greeter_migration.js. Then you should run the below command to deploy this smart contract. truffle migrate –f 5 –network klaytn.

2. Deploy contracts on the network can be simple if you have some knowledge. You only need to run the command below to deploy and compile the fungible token contract.

npm run deploy:kliten:kip7

Then you would see the deployed abi and address if the deployment went well.

 Conclusion

Smart contracts in Klaytn are special programs that are all the rage. With knowledge about secure smart contract development, this process will be easy. Klaytn is gaining popularity as it holds great promise.

FAQ