Designing Secure Crypto Treasury Infrastructure

Overview

Building a secure crypto treasury requires balancing accessibility with security. This guide covers the practical engineering decisions for production-grade treasury infrastructure.

Architecture Principles

1. Multisig Everything — No single point of failure
2. Defense in Depth — Multiple security layers
3. Observability First — Know what's happening in real-time
4. Incident Response — Plan for compromise

Hot vs Cold Wallet Strategy

Hot Wallet (Operational)

• Holds 5-10% of total treasury
• 2-of-3 multisig minimum
• Automated monitoring & alerts
• Rate limiting on withdrawals

interface HotWalletConfig {
  signers: Address[];
  threshold: number;
  dailyLimit: BigNumber;
  cooldownPeriod: number; // seconds
}

const operationalWallet: HotWalletConfig = {
  signers: [DevOps, Finance, CTO],
  threshold: 2,
  dailyLimit: parseEther("50"),
  cooldownPeriod: 3600, // 1 hour
};

Cold Wallet (Long-term Storage)

• 90-95% of treasury
• 3-of-5 or 4-of-7 multisig
• Hardware wallet signers
• Quarterly access reviews

Monitoring & Alerts

Set up real-time monitoring for:

• Unexpected transactions — Any tx not initiated through your system
• Balance changes — Track inflows/outflows
• Gas price anomalies — Detect potential attacks
• Signer changes — Alert on ownership modifications

async function monitorTreasury(address: Address) {
  const balance = await provider.getBalance(address);
  const threshold = parseEther("1000");
  
  if (balance.lt(threshold)) {
    await alert("Treasury balance below threshold", {
      current: formatEther(balance),
      threshold: formatEther(threshold),
    });
  }
}

Incident Response Plan

When compromise is suspected:

1. Freeze operations — Pause all automated systems
2. Secure remaining funds — Emergency transfer to backup wallet
3. Investigate — Analyze transaction history, check signer security
4. Communicate — Internal team + stakeholders
5. Post-mortem — Document and improve

Key Takeaways

• Never compromise on multisig for production treasuries
• Monitoring is not optional — you need real-time visibility
• Test your incident response before you need it
• Separate hot/cold wallets based on operational needs

Next: Building Automated Deposit Detection Systems