Keplr TX Template

This repository provides a sample project demonstrating how to handle ethsecp256k1 signatures for the Kiichain blockchain. It serves as a reference for developers integrating Keplr wallet functionality with Kiichain.

Features

• Example implementation of ethsecp256k1 signature handling.
• Integration with Keplr wallet for signing transactions.
• Demonstrates interaction with Kiichain blockchain.

Signature can be found at:

• cosmjs

Signing Transactions with ethsecp256k1

This is what is needed to sign a transaction with ethsecp256k1.

1. Create the SigningStargateClient with the correct type

// Start the client connection
// The stargate client must use the custom account parser
// This is necessary to handle the ethsecp256k1 PubKey format in queries
const client = await SigningStargateClient.connectWithSigner(
  RPC_ENDPOINT,
  offlineSigner,
  {
    accountParser: ethsecpAccountParser,
  }
);

The signing client must use a custom account parser to handle the ethsecp256k1 public key format. This is crucial for correctly signing transactions.

2. Sign the transaction with a custom pubkey

// This is the important bit
// This signs the transaction using the ethsecp256k1 signer
// It basically rewrite the Pubkey to the ethsecp256k1 format
const txRaw = await signWithEthsecpSigner(
  client,
  offlineSigner,
  CHAIN_ID,
  address,
  [msgSend],
  "This is a sample transaction memo",
  KEPLR_CHAIN_INFO.feeCurrencies[0].gasPriceStep.high,
  1.5
);

3. Broadcast the signed transaction

const receipt = await client.broadcastTx(txRaw);

Prerequisites

• Node.js (v16 or higher recommended)
• KiiJs library installed

Installation

1. Clone the repository:

git clone https://github.com/yourusername/keplr-tx-template.git
cd keplr-tx-template

2. Install dependencies:

npm install

Usage

1. Start the development server:

npm run dev

2. Open your browser on the displayed localhost and connect your Keplr wallet.

3. Follow the instructions in the app to sign and send transactions using ethsecp256k1.