Smart Contract Security: Lessons Learned from Building Fintech Payment Systems

<h1> 5 Solidity Mistakes I Made While Learning Smart Contract Development </h1> <p>When I started learning Solidity, I thought smart contract development was mainly about learning

<blockquote> <p>Cross-post. Original: <strong><a href="https://www.stellarbytecapital.com/blog/cross-border-payment-system-design/" rel="noopener

<p>When people think about fintech engineering, they often focus on the backend.</p> <p>Payments.<br /> Bank integrations.<br /> Ledgers.<br /> Settlement systems.</p> <p>And

<p>Most backend tutorials stop at "hash the password, you're secure now." That's good advice for authentication. It's not much use for the rest of a payment system, where you're

<p>In our last post, we built a mathematical proving ground using <a href="https://www.getfoundry.sh" rel="noopener noreferrer">Foundry</a>. We used stateful fuzzing to prove that

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<p>Opening a 600-line Solidity contract you have never seen is intimidating. Where do you even start? Over time I developed a reading order that turns the wall of code into

<p>The OWASP Smart Contract Top 10 reshuffled in 2026 — reentrancy dropped from #2 to #8, proxy vulnerabilities entered the chart, and business logic flaws climbed. But the real