Security

Introduction Bitcoin apps have evolved far beyond simple send-and-receive wallets. Today’s ecosystem includes secure self-custody wallets, Lightning Network payment apps, merchant point-of-sale systems, full nodes and infrastructure tools, privacy and multisig coordinators, tax and portfolio software, and developer SDKs. This guide provides a comprehensive, practical overview to help you choose, set up, and safely use Bitcoin apps depending on your goals—whether you’re a newcomer, a merchant, a power user, or a developer. ...

Introduction Webhooks are the backbone of modern, event-driven integrations. Instead of continuously polling an API to ask “has anything changed yet?”, webhooks let services push events to your application as soon as they happen: a payment succeeds, a repository receives a push, a customer updates their profile, or a ticket is assigned. This in-depth tutorial will take you from zero to hero. You’ll learn: What webhooks are and how they compare to polling and WebSockets How to build robust webhook receivers in multiple languages Signature verification, replay protection, and other security best practices Idempotency and reliable processing with retries and dead-letter queues How to test locally using tunnels and inspector tools How to design and operate your own webhook provider at scale Links to the best official docs and tools in the ecosystem If you’re implementing webhooks for the first time or trying to harden your production setup, this guide will meet you where you are and help you ship with confidence. ...

What is SSH in Simple Terms? Think of SSH keys like a secure key and lock system for your computer to talk to GitHub: Private Key = Your actual house key (keep it secret!) Public Key = A copy of your lock that you give to GitHub When you connect, GitHub tests your key in their lock - if it fits, you’re in! Step-by-Step Setup (5 minutes) 1. Create Your SSH Key ssh-keygen -t ed25519 -C "your_email@example.com" # Press Enter 3 times (uses default locations, no password) # Creates two files: id_ed25519 (private) and id_ed25519.pub (public) 2. Add Key to SSH Agent # Start the SSH agent eval "$(ssh-agent -s)" # Add your private key ssh-add ~/.ssh/id_ed25519 3. Add Public Key to GitHub # Copy your public key to clipboard cat ~/.ssh/id_ed25519.pub | pbcopy # macOS # OR cat ~/.ssh/id_ed25519.pub | xclip -selection clipboard # Linux Then: ...