Admin Security

// hardhat.config.ts
import { HardhatUserConfig } from 'hardhat/config';

const config: HardhatUserConfig = {
<HardhatNetworkConfig />
};

export default config;

Team Member A proposes transaction
    ↓
Team Member B reviews and signs
    ↓
Threshold reached → Transaction executes

import { KMSClient, SignCommand } from '@aws-sdk/client-kms';
import { createWalletClient, http, type Account } from 'viem';
import { immutableZkEvm } from 'viem/chains';

// Create a KMS-backed account for viem
async function createKMSAccount(keyId: string): Promise<Account> {
  const kms = new KMSClient({ region: 'us-east-1' });

  return {
    address: '0x...', // Derive from KMS public key
    type: 'local',
    signMessage: async ({ message }) => {
      const command = new SignCommand({
        KeyId: keyId,
        Message: Buffer.from(message as string),
        SigningAlgorithm: 'ECDSA_SHA_256',
        MessageType: 'DIGEST',
      });
      const response = await kms.send(command);
      // Process and return signature
      return '0x...' as `0x${string}`;
    },
    signTransaction: async (tx) => {
      // Sign transaction with KMS
      return '0x...' as `0x${string}`;
    },
    signTypedData: async (data) => {
      // Sign typed data with KMS
      return '0x...' as `0x${string}`;
    },
  };
}

// Use with viem
const account = await createKMSAccount(process.env.KMS_KEY_ID!);
const walletClient = createWalletClient({
  account,
  chain: immutableZkEvm,
  transport: http(),
});

import rateLimit from 'express-rate-limit';

const mintLimiter = rateLimit({
  windowMs: 60 * 1000, // 1 minute
  max: 100, // 100 requests per minute
  message: 'Too many mint requests',
});

app.post('/api/mint', mintLimiter, async (req, res) => {
  // Log all mint operations
  logger.info('Mint request', {
    recipient: req.body.address,
    tokenId: req.body.tokenId,
    timestamp: new Date(),
  });
  
  // Process mint...
});

import { createPublicClient, http, formatEther } from 'viem';
import { immutableZkEvm } from 'viem/chains';

const publicClient = createPublicClient({
  chain: immutableZkEvm,
  transport: http(),
});

async function estimateGas(to: `0x${string}`, data: `0x${string}`) {
  const gasEstimate = await publicClient.estimateGas({ to, data });
  const gasPrice = await publicClient.getGasPrice();
  
  const maxCost = gasEstimate * gasPrice;
  console.log(`Max cost: ${formatEther(maxCost)} IMX`);
}

import { createPublicClient, http, formatEther, parseEther } from 'viem';
import { immutableZkEvm } from 'viem/chains';

const publicClient = createPublicClient({
  chain: immutableZkEvm,
  transport: http(),
});

async function checkBalance(address: `0x${string}`, threshold: bigint) {
  const balance = await publicClient.getBalance({ address });
  
  if (balance < threshold) {
    await sendAlert(`Wallet ${address} balance low: ${formatEther(balance)} IMX`);
  }
}

// Run periodically
setInterval(() => checkBalance(MINTER_WALLET, parseEther('10')), 60000);