Blockchain Web3 Expert

Blockchain & Web3 Expert (2026 Edition)

English | Bahasa Indonesia

English

Orchestration & Integration

• senior-frontend: React and Next.js frontend state for Web3 wallets.
• authentication-identity-expert: Sign-In with Ethereum (SIWE / ERC-4361).
• error-resilience-expert: Handling RPC node timeouts, network switches, and user transaction rejections.
• post-quantum-crypto-migrator: Future-proofing cryptographic signatures and hash functions.

Description

Production-ready guide for building decentralized applications (dApps) on EVM-compatible blockchains. Covers typed smart contract interactions with viem and wagmi v2, wallet connectivity with RainbowKit / AppKit, gas estimation, transaction lifecycle management, ERC-20 / ERC-721 / ERC-1155 standards, and decentralized storage (IPFS/Arweave).

Trigger Conditions

• Integrating crypto wallet connections (MetaMask, Coinbase Wallet, WalletConnect).
• Reading from and writing to Ethereum / Polygon / Arbitrum / Base smart contracts.
• Implementing Sign-In With Ethereum (SIWE) authentication.
• Minting, transferring, or querying ERC-20 tokens or NFTs.

Core Architecture & Modern Patterns

1. Wallet Connection & Config (wagmi.config.ts)

import { http, createConfig } from 'wagmi';
import { mainnet, base, arbitrum } from 'wagmi/chains';
import { injected, walletConnect } from 'wagmi/connectors';

export const config = createConfig({
  chains: [mainnet, base, arbitrum],
  connectors: [
    injected(),
    walletConnect({ projectId: process.env.NEXT_PUBLIC_WALLETCONNECT_PROJECT_ID! }),
  ],
  transports: {
    [mainnet.id]: http(),
    [base.id]: http(),
    [arbitrum.id]: http(),
  },
});

2. Contract Interaction Hook (Wagmi v2 + Viem)

import { useAccount, useReadContract, useWriteContract, useWaitForTransactionReceipt } from 'wagmi';
import { parseAbi } from 'viem';

const ERC20_ABI = parseAbi([
  'function balanceOf(address owner) view returns (uint256)',
  'function transfer(address to, uint256 amount) returns (bool)',
]);

export function TokenTransferCard({ tokenAddress }: { tokenAddress: `0x${string}` }) {
  const { address, isConnected } = useAccount();
  const { data: balance, refetch } = useReadContract({
    address: tokenAddress,
    abi: ERC20_ABI,
    functionName: 'balanceOf',
    args: address ? [address] : undefined,
  });

  const { data: hash, writeContract, isPending } = useWriteContract();
  const { isLoading: isConfirming, isSuccess } = useWaitForTransactionReceipt({ hash });

  const handleSend = (recipient: `0x${string}`, amount: bigint) => {
    writeContract({
      address: tokenAddress,
      abi: ERC20_ABI,
      functionName: 'transfer',
      args: [recipient, amount],
    });
  };

  if (!isConnected) return <p>Please connect your wallet.</p>;

  return (
    <div>
      <p>Balance: {balance?.toString()}</p>
      {isPending && <p>Waiting for signature...</p>}
      {isConfirming && <p>Confirming transaction on-chain...</p>}
      {isSuccess && <p>Transfer completed successfully!</p>}
    </div>
  );
}

Bahasa Indonesia

Integrasi Orkestrasi

• senior-frontend: Integrasi komponen React dan Next.js untuk antarmuka dApp.
• authentication-identity-expert: Autentikasi Sign-In with Ethereum (SIWE).
• error-resilience-expert: Penanganan kegagalan RPC dan penolakan transaksi oleh pengguna.

Deskripsi

Panduan produksi untuk membangun aplikasi terdesentralisasi (dApp) di jaringan EVM. Mencakup koneksi dompet Web3 via viem, wagmi v2, RainbowKit, interaksi smart contract type-safe, estimasi gas, dan standar token ERC-20/721.

Kondisi Pemicu

• Mengintegrasikan koneksi dompet Web3 ke aplikasi web.
• Berinteraksi dengan smart contract di jaringan Ethereum, Base, Arbitrum, atau Polygon.
• Menerapkan login dengan dompet kripto (SIWE).