In this guide, we'll explore how to build secure backend APIs using Next.js for the frontend and Golang for the backend. We'll focus on implementing security best practices to protect your APIs from common vulnerabilities.

How I built Crossbook, a hybrid exchange where traders sign EIP-712 orders off-chain, a pure Rust engine crosses them, and a Solidity contract re-verifies every signature and limit before swapping tokens atomically. A walkthrough of the trust boundary, the 512-bit price math, the cross-language EIP-712 parity gate, and the adversarial test suite that is the whole point.

In this article, I share my journey mining the JER Cryptocurrency genesis block with production-grade difficulty, the challenges I faced, and the technical solutions I developed using C++, OpenSSL, and Bitcoin Core.