This example shows a force-directed graph of Bitcoin transaction relationships, where nodes represent addresses and links represent transactions. The visualization uses d3.forceSimulation with link, charge, and center forces to position the nodes, while d3.drag enables interactive node movement. Links are rendered as SVG lines, nodes as circles with title tooltips, and the data loads from a remote CSV file containing node pairs. The simulation updates node and link positions on each tick, with the alphaTarget method controlling simulation restarts during dragging.