Real-time BTC/USD orderbook visualizer built in Rust. Connects to Kraken WebSocket v2.

• Live orderbook with CRC32 checksum validation
• Time-travel slider (replay history)
• Depth chart
• Heatmap showing liquidity over time

cargo run --release

• Ownership and borrowing
• Structs and enums for data modeling
• Pattern matching with match
• Error handling with Result and ? operator
• Async/await with tokio
• Channels (mpsc) for async to sync communication
• Iterators (.iter(), .enumerate())
• Type conversions and trait bounds (ToPrimitive)

• How orderbooks work (bids/asks, price levels)
• Snapshot + delta updates pattern
• CRC32 checksum for data integrity
• Desync detection and recovery (resubscribe on mismatch)
• Cumulative depth calculation

• im::OrdMap - persistent data structure with structural sharing
• Why cheap clones matter for time-travel/history
• Ring buffer concept for bounded memory

• egui immediate mode UI (rebuilt every frame)
• Custom drawing with Painter
• Coordinate mapping (price to Y-pixel)
• Color intensity from quantity values
• Heatmap concept: X=time, Y=price, Color=liquidity