Deep-dive guides on AI agents, agent orchestration, MCP, and developer tooling.
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IBANs aren't just a longer account number — the last two digits are a mod-97 checksum that catches typos and transposed digits before a wire transfer goes to the wrong bank. Here's the actual arithmetic, worked through on a real-looking IBAN.
The Luhn checksum baked into every credit card number catches keystroke errors, not fraud — here is the math behind it, why card network prefixes matter, and where naive validators break.