Klaytn wormhole starter kit

• Klaytn wormhole starter kit
  • About
  • Folder Structure
  • Installation
  • Quick Start
  • 1. Token Attestation
    • Parameters
    • Returns
    • Example
  • 2.Transfer Tokens
    • Parameters
    • Returns
    • Example
  • Reference Docs:

About

Wormhole is a communication bridge between Klaytn and other top decentralized finance (DeFi) networks. Existing projects, platforms, and communities are able to move tokenized assets seamlessly across blockchains and benefit from Klaytn's high speed and low cost.

Folder Structure

• core: it includes @wormhole-sdk and the contracts ABIs
• use-cases: Ready-to-run code of some use-cases to call the Wormhole Rest APIs.

Installation

npm install @klaytn/kss-bridges-wormhole --save

Quick Start

BridgeSDK contains the implementation of the bridge use-cases. CoreBridgeSDK exposes methods of @certusone/wormhole-sdk to write custom methods.

import BridgeSDK from '@klaytn/kss-bridges-wormhole';
import CoreBridgeSDK from '@klaytn/kss-bridges-wormhole/core';

or

const BridgeSDK = require('@klaytn/kss-bridges-wormhole');
const CoreBridgeSDK = require('@klaytn/kss-bridges-wormhole/core');

You can run following ready-made use-cases to test

1. Token Attestation

Attests a token of one chain (source chain) to another chain (destination chain) for EVM compatible chains.

BridgeSDK.attest(config, source, destination)

NOTE: Make sure the Token to be attested is present in source chain. Native fee coins in source and destination chain in the provided privatekey account is sufficient.

Parameters

1. Object - config
   • restAddress - string wormhole api url. See Wormhole Rpc Nodes for reference.
2. Object - source
   • token - string token contract address to be attested
   • privatekey - string privatekey to perform transactions
   • rpcUrl - string blockchain rpc url
   • coreBridge - string core bridge contract address. see Testnet CoreBridge for reference.
   • tokenBridge - string token bridge contract address. see Testnet TokenBridge for reference.
   • wormholeChainId - string wormhole chainID. see Testnet WormholeChainID for reference.
3. Object - destination
   • privatekey - string privatekey to perform transactions
   • rpcUrl - string blockchain rpc url
   • tokenBridge - string token bridge contract address. see Testnet TokenBridge for reference.
   • wormholeChainId - string wormhole chainID. see Testnet WormholeChainID for reference.

Returns

String - Deployed contract address on Destination chain

Example

const BridgeSDK = require('@klaytn/kss-bridges-wormhole');
const CoreBridgeSDK = require('@klaytn/kss-bridges-wormhole/core');

const config = { restAddress: "https://wormhole-v2-testnet-api.certus.one" };
const source = {
  token: "0x0FD3f122A9B6471928B60eeE73bF35D895C4Ee01", // Token to be attested
  privatekey: "source chain private key",
  rpcUrl: "https://api.baobab.klaytn.net:8651",
  coreBridge: "0x1830CC6eE66c84D2F177B94D544967c774E624cA",
  tokenBridge: "0xC7A13BE098720840dEa132D860fDfa030884b09A",
  wormholeChainId: "13" 
};
const destination = {
  privatekey: "destination chain private key",
  rpcUrl: "https://ethereum-goerli-rpc.allthatnode.com",
  tokenBridge: "0xF890982f9310df57d00f659cf4fd87e65adEd8d7",
  wormholeChainId: "2" 
}

console.log(CoreBridgeSDK.CHAINS); // prints the chains from @certusone/wormhole-sdk

const destinationDeployedContract = await BridgeSDK.attest(config, source, destination);

// Destination chain deployed contract
console.log(destinationDeployedContract); // 0xfdA23F910E5CE6b7C712F624DE20d9cC3A5d2122

2.Transfer Tokens

Transfer tokens from source chain to destination chain for EVM compatible chains.

BridgeSDK.transferBasic(config, source, destination, AMOUNT, IS_NATIVE)

NOTE: Make sure the tokens/coins is present in source chain. Native fee coins in source and destination chain in the provided privatekey account is sufficient.

Parameters

1. Object - config
   • restAddress - string wormhole api url. See Wormhole Rpc Nodes for reference.
2. Object - source
   • token - string token contract address. Provide if IS_NATIVE is false.
   • privatekey - string privatekey to perform transactions
   • rpcUrl - string blockchain rpc url
   • coreBridge - string core bridge contract address. see Testnet CoreBridge for reference.
   • tokenBridge - string token bridge contract address. see Testnet TokenBridge for reference.
   • wormholeChainId - string wormhole chainID. see Testnet WormholeChainID for reference.
3. Object - destination
   • privatekey - string privatekey to perform transactions
   • rpcUrl - string blockchain rpc url
   • tokenBridge - string token bridge contract address. see Testnet TokenBridge for reference.
   • wormholeChainId - string wormhole chainID. see Testnet WormholeChainID for reference.
4. Amount - string - Amount to be transferred.
5. IS_NATIVE - boolean - Provide true if its a native coin transfer from source and false if its a token transfer.

Returns

Object - Transaction Object

Example

const BridgeSDK = require('@klaytn/kss-bridges-wormhole');
const CoreBridgeSDK = require('@klaytn/kss-bridges-wormhole/core');

const config = { restAddress: "https://wormhole-v2-testnet-api.certus.one" };
const source = {
  token: "0x0FD3f122A9B6471928B60eeE73bF35D895C4Ee01", // Token to be attested
  privatekey: "source chain private key",
  rpcUrl: "https://api.baobab.klaytn.net:8651",
  coreBridge: "0x1830CC6eE66c84D2F177B94D544967c774E624cA",
  tokenBridge: "0xC7A13BE098720840dEa132D860fDfa030884b09A",
  wormholeChainId: "13" 
};
const destination = {
  privatekey: "destination chain private key",
  rpcUrl: "https://ethereum-goerli-rpc.allthatnode.com",
  tokenBridge: "0xF890982f9310df57d00f659cf4fd87e65adEd8d7",
  wormholeChainId: "2" 
}
// Transfers 1 token from source chain's provided token address.
const AMOUNT = "1";
const IS_NATIVE = false;

console.log(CoreBridgeSDK.CHAINS); // prints the chains from @certusone/wormhole-sdk

const result = await BridgeSDK.transferBasic(config, source, destination, AMOUNT, IS_NATIVE);

// Transaction hash of the destination chain
console.log(result.hash);

Reference Docs:

• https://www.npmjs.com/package/@certusone/wormhole-sdk
• https://book.wormhole.com/technical/typescript/attestingToken.html
• Testnet Website URL
• Mainnet Website URL