bitcoin-halving

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BTC://TERMINAL — Bitcoin Halving Countdown is a retro‑styled, browser‑based terminal that displays a live countdown to the next Bitcoin halving. It combines a nostalgic CRT‑green interface with real‑time blockchain data, offering both a visual spectacle and a functional command‑line interface (CLI) for crypto enthusiasts.OverviewThe site simulates an old‑school terminal window, complete with scanlines, phosphor glow, and a blinking cursor. At its core, it calculates the estimated time remaining until the next halving by anchoring to a known block height (block #840,000, the 4th halving) and extrapolating forward at an average of 10 minutes per block. It optionally syncs with the mempool.space API to fetch the real‑time block height and BTC price, ensuring accuracy. The countdown updates every second, showing days, hours, minutes, and seconds. A progress bar visualizes the current epoch’s progress, while metadata displays the target block, block subsidy before/after, and network status.Key FeaturesLive Countdown: Days, hours, minutes, and seconds until the next halving.Dynamic Block Height Estimation: Uses a reference block and average block time; can sync with mempool.space for real‑time accuracy.Interactive Terminal: Over 12 commands (e.g., help, status, next, halvings, price, sync, setblock, reset, date, about, clear), command history (↑/↓), and tab‑completion.Historical & Future Data: Complete halving schedule (epochs 0–33) loaded from a JSON file, with fallback embedded data.Responsive & Accessible: Works on mobile and desktop; respects prefers-reduced-motion; includes ARIA labels.Offline‑First: Functions without network by using local estimation; optional online sync enhances precision.Zero Dependencies: Pure HTML, CSS, and vanilla JavaScript. No frameworks, no build step.Aesthetic: CRT scanlines, phosphor‑green text, Bitcoin‑orange accents, and a subtle flicker animation.Technical StackFrontend: HTML5, CSS3 (custom properties, flexbox, grid, animations), JavaScript (ES6+, async/await, Fetch API).Data: data/halvings.json contains the full halving schedule with metadata.APIs: mempool.space for block height and fiat prices (optional, non‑blocking).Storage: localStorage for manual block height override.Hosting: Can be served statically (GitHub Pages, Netlify, Vercel, or any web server).Target AudienceBitcoin and cryptocurrency enthusiasts.Developers and tech‑savvy users who appreciate CLI interfaces.Educators and content creators looking for a visual aid about Bitcoin’s monetary policy.Anyone curious about the halving mechanism and its timeline.Use CasesQuick reference for the next halving date and block.Educational tool for explaining Bitcoin’s deflationary supply schedule.A fun, retro‑styled widget to embed or share.A starting point for developers to build custom crypto dashboards.Unique Selling PointsCombines a nostalgic terminal aesthetic with live blockchain data.Fully client‑side, privacy‑friendly (no tracking, no cookies).Works offline with graceful degradation.Open‑source under MIT license, encouraging contributions and customization.Highly customizable via CSS variables and a modular command system.