A demo to transform real gas prices on the Arbitrum blockchain into music + spectrum visualization + NFT metadata.
* **7-Day History:** Fetches the last 168 hours of data from the Arbitrum One network via RPC.
* **Smart Activity Detection:** Automatically switches between "Gas Price" (L1 Fees) and "Gas Used" (L2 Congestion) to ensure dynamic melodies even when L2 fees are flat (0.01 Gwei).
* **Web Audio Synth:** A custom-built synthesizer using the Web Audio API (no external audio libraries).