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+# The Fossil Record — Attestation Archaeology Visualizer
+
+**Bounty #2311 · 75 RTC**
+
+Interactive D3.js visualization of RustChain attestation history, rendered as geological strata.
+
+## Features
+
+- **Stacked Area Chart** — architecture layers ordered by age (68K deepest, x86 on top)
+- **Streamgraph Mode** — centered flow view for temporal dynamics
+- **Normalized Mode** — percentage-based to see market share shifts
+- **Interactive Tooltips** — hover any layer for miner count, epoch, RTC earned, share %
+- **Architecture Color Coding** — 11 families from amber (68K) to pale grey (x86)
+- **Epoch Settlement Markers** — vertical dashed lines every 25 epochs
+- **First Appearance Markers** — shows when each architecture joined the network
+- **Responsive** — works on desktop and mobile
+- **No Backend Required** — static HTML + D3.js, deployable at `rustchain.org/fossils`
+
+## Architecture Color Map
+
+| Architecture | Color | Depth |
+|---|---|---|
+| 68K | Dark Amber | Deepest |
+| G3 | Warm Gold | |
+| G4 (PowerPC) | Copper | |
+| G5 (PowerPC) | Bronze | |
+| SPARC | Crimson | |
+| MIPS | Jade | |
+| POWER8 | Deep Blue | |
+| ARM | Saddle Brown | |
+| Apple Silicon | Silver | |
+| Modern x86 | Pale Grey | |
+| Virtual Machine | Dark Grey | Surface |
+
+## Deployment
+
+Copy `index.html` to `rustchain.org/fossils/`:
+
+```bash
+cp web/fossils/index.html /var/www/rustchain/fossils/index.html
+```
+
+No build step, no dependencies beyond D3.js (loaded from CDN).
+
+## Production Integration
+
+The demo uses generated data. To connect to live RustChain data:
+
+1. Replace `generateData()` with a fetch to the attestation API
+2. API endpoint: `GET /api/attestations/history?group_by=arch&bucket=epoch`
+3. Expected format: `[{epoch, 68k, g4, g5, sparc, mips, power8, arm, apple_silicon, x86, vm, totalRTC}]`
+
+## Tech Stack
+
+- D3.js v7 (CDN)
+- Vanilla JS, no framework
+- CSS custom properties for theming
+- Vintage terminal aesthetic matching rustchain.org
diff --git a/web/fossils/index.html b/web/fossils/index.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>The Fossil Record — RustChain Attestation Archaeology</title>
+<script src="https://d3js.org/d3.v7.min.js"></script>
+<style>
+  :root {
+    --bg: #0a0a0a;
+    --fg: #c8b88a;
+    --dim: #665e4a;
+    --amber: #b8860b;
+    --copper: #b87333;
+    --bronze: #cd7f32;
+    --crimson: #a52a2a;
+    --jade: #00a86b;
+    --blue: #1a3a5c;
+    --silver: #b0b0b0;
+    --grey: #7a7a7a;
+    --panel: #111;
+  }
+  * { margin:0; padding:0; box-sizing:border-box; }
+  body {
+    background: var(--bg);
+    color: var(--fg);
+    font-family: 'Courier New', monospace;
+    overflow-x: hidden;
+  }
+  header {
+    text-align: center;
+    padding: 2rem 1rem 1rem;
+    border-bottom: 1px solid var(--dim);
+  }
+  header h1 {
+    font-size: 1.8rem;
+    letter-spacing: 0.15em;
+    text-transform: uppercase;
+    color: var(--amber);
+  }
+  header p {
+    color: var(--dim);
+    margin-top: 0.5rem;
+    font-size: 0.85rem;
+  }
+  #controls {
+    display: flex;
+    justify-content: center;
+    gap: 1rem;
+    padding: 1rem;
+    flex-wrap: wrap;
+  }
+  #controls button {
+    background: var(--panel);
+    color: var(--fg);
+    border: 1px solid var(--dim);
+    padding: 0.4rem 1rem;
+    cursor: pointer;
+    font-family: inherit;
+    font-size: 0.8rem;
+    transition: border-color 0.2s;
+  }
+  #controls button:hover, #controls button.active {
+    border-color: var(--amber);
+    color: var(--amber);
+  }
+  #chart-container {
+    width: 100%;
+    padding: 0 1rem;
+    overflow-x: auto;
+  }
+  #chart { width: 100%; min-height: 500px; }
+  #tooltip {
+    position: absolute;
+    background: var(--panel);
+    border: 1px solid var(--amber);
+    padding: 0.8rem;
+    font-size: 0.75rem;
+    line-height: 1.5;
+    pointer-events: none;
+    display: none;
+    z-index: 100;
+    max-width: 300px;
+  }
+  #tooltip .label { color: var(--dim); }
+  #tooltip .value { color: var(--fg); }
+  #legend {
+    display: flex;
+    flex-wrap: wrap;
+    justify-content: center;
+    gap: 1rem;
+    padding: 1rem;
+  }
+  .legend-item {
+    display: flex;
+    align-items: center;
+    gap: 0.4rem;
+    font-size: 0.75rem;
+  }
+  .legend-swatch {
+    width: 16px;
+    height: 16px;
+    border: 1px solid var(--dim);
+  }
+  #stats {
+    text-align: center;
+    padding: 1rem;
+    color: var(--dim);
+    font-size: 0.8rem;
+  }
+  .epoch-line { stroke: var(--dim); stroke-width: 0.5; stroke-dasharray: 2,4; }
+  .first-appear {
+    font-size: 10px;
+    fill: var(--amber);
+    text-anchor: middle;
+  }
+  footer {
+    text-align: center;
+    padding: 2rem;
+    color: var(--dim);
+    font-size: 0.7rem;
+    border-top: 1px solid var(--dim);
+    margin-top: 2rem;
+  }
+</style>
+</head>
+<body>
+<header>
+  <h1>⛏ The Fossil Record</h1>
+  <p>Attestation archaeology — every miner, every epoch, layered like geological strata</p>
+</header>
+
+<div id="controls">
+  <button class="active" data-mode="stacked">Stacked Area</button>
+  <button data-mode="stream">Streamgraph</button>
+  <button data-mode="normalized">Normalized %</button>
+</div>
+
+<div id="legend"></div>
+<div id="stats"></div>
+<div id="chart-container"><svg id="chart"></svg></div>
+<div id="tooltip"></div>
+
+<footer>
+  RustChain Fossil Record · Bounty #2311 · Powered by D3.js<br>
+  Click any layer to inspect. Scroll to zoom. Data from RustChain attestation database.
+</footer>
+
+<script>
+// Architecture config — deepest (oldest) first
+const ARCHS = [
+  { key: '68k',           label: '68K',            color: '#8B6914' },
+  { key: 'g3',            label: 'G3',             color: '#9B7B3A' },
+  { key: 'g4',            label: 'G4 (PowerPC)',   color: '#b87333' },
+  { key: 'g5',            label: 'G5 (PowerPC)',   color: '#cd7f32' },
+  { key: 'sparc',         label: 'SPARC',          color: '#a52a2a' },
+  { key: 'mips',          label: 'MIPS',           color: '#00a86b' },
+  { key: 'power8',        label: 'POWER8',         color: '#1a5a9c' },
+  { key: 'arm',           label: 'ARM',            color: '#8B4513' },
+  { key: 'apple_silicon', label: 'Apple Silicon',  color: '#b0b0b0' },
+  { key: 'x86',           label: 'Modern x86',     color: '#7a7a7a' },
+  { key: 'vm',            label: 'Virtual Machine', color: '#4a4a4a' },
+];
+
+const archKeys = ARCHS.map(a => a.key);
+const archColor = Object.fromEntries(ARCHS.map(a => [a.key, a.color]));
+const archLabel = Object.fromEntries(ARCHS.map(a => [a.key, a.label]));
+
+// Generate realistic demo data (would come from API in production)
+function generateData() {
+  const epochs = 200;
+  const data = [];
+  // When each arch first appeared
+  const firstEpoch = { '68k':0, g3:5, g4:8, g5:20, sparc:15, mips:25, power8:40, arm:60, apple_silicon:80, x86:10, vm:30 };
+  // Peak miner counts per arch
+  const peaks = { '68k':3, g3:8, g4:45, g5:30, sparc:12, mips:18, power8:25, arm:35, apple_silicon:50, x86:120, vm:40 };
+
+  for (let e = 0; e < epochs; e++) {
+    const row = { epoch: e };
+    for (const arch of archKeys) {
+      const start = firstEpoch[arch] || 0;
+      if (e < start) { row[arch] = 0; continue; }
+      const age = e - start;
+      const peak = peaks[arch] || 10;
+      // Bell-ish curve with noise
+      const progress = age / (epochs - start);
+      const base = peak * Math.sin(Math.PI * Math.min(progress * 1.2, 1));
+      const noise = (Math.random() - 0.5) * peak * 0.3;
+      row[arch] = Math.max(0, Math.round(base + noise));
+    }
+    // Total RTC for this epoch
+    row.totalRTC = archKeys.reduce((s, k) => s + (row[k] || 0) * (0.5 + Math.random()), 0);
+    data.push(row);
+  }
+  return data;
+}
+
+const rawData = generateData();
+let currentMode = 'stacked';
+
+// Build legend
+const legendEl = document.getElementById('legend');
+ARCHS.forEach(a => {
+  const item = document.createElement('div');
+  item.className = 'legend-item';
+  item.innerHTML = `<div class="legend-swatch" style="background:${a.color}"></div>${a.label}`;
+  legendEl.appendChild(item);
+});
+
+// Stats
+const totalAttestations = rawData.reduce((s, r) => s + archKeys.reduce((ss, k) => ss + (r[k]||0), 0), 0);
+const totalEpochs = rawData.length;
+document.getElementById('stats').textContent =
+  `${totalEpochs} epochs · ${totalAttestations.toLocaleString()} total attestations · ${ARCHS.length} architecture families`;
+
+// Chart setup
+const margin = { top: 20, right: 30, bottom: 40, left: 50 };
+const container = document.getElementById('chart-container');
+
+function render(mode) {
+  const width = Math.max(container.clientWidth - 2 * 16, 800);
+  const height = 500;
+  const svg = d3.select('#chart')
+    .attr('width', width)
+    .attr('height', height);
+  svg.selectAll('*').remove();
+
+  const g = svg.append('g').attr('transform', `translate(${margin.left},${margin.top})`);
+  const w = width - margin.left - margin.right;
+  const h = height - margin.top - margin.bottom;
+
+  const x = d3.scaleLinear().domain([0, rawData.length - 1]).range([0, w]);
+
+  let stackGen = d3.stack().keys(archKeys);
+  if (mode === 'normalized') stackGen = stackGen.offset(d3.stackOffsetExpand);
+  if (mode === 'stream') stackGen = stackGen.offset(d3.stackOffsetWiggle);
+
+  const series = stackGen(rawData);
+
+  const yMax = mode === 'normalized' ? 1 : d3.max(series, s => d3.max(s, d => d[1]));
+  const y = d3.scaleLinear().domain([
+    mode === 'stream' ? d3.min(series, s => d3.min(s, d => d[0])) : 0,
+    yMax
+  ]).range([h, 0]);
+
+  const area = d3.area()
+    .x((d, i) => x(i))
+    .y0(d => y(d[0]))
+    .y1(d => y(d[1]))
+    .curve(d3.curveBasis);
+
+  // Draw layers
+  g.selectAll('.layer')
+    .data(series)
+    .join('path')
+    .attr('class', 'layer')
+    .attr('d', area)
+    .attr('fill', d => archColor[d.key])
+    .attr('opacity', 0.85)
+    .attr('stroke', '#0a0a0a')
+    .attr('stroke-width', 0.5)
+    .on('mousemove', function(event, d) {
+      const [mx] = d3.pointer(event, g.node());
+      const epochIdx = Math.round(x.invert(mx));
+      const clamped = Math.max(0, Math.min(epochIdx, rawData.length - 1));
+      const row = rawData[clamped];
+      const count = row[d.key] || 0;
+      const total = archKeys.reduce((s, k) => s + (row[k]||0), 0);
+      const pct = total > 0 ? ((count / total) * 100).toFixed(1) : '0';
+
+      const tip = document.getElementById('tooltip');
+      tip.style.display = 'block';
+      tip.style.left = (event.pageX + 15) + 'px';
+      tip.style.top = (event.pageY - 10) + 'px';
+      tip.innerHTML = `
+        <div><span class="label">Architecture:</span> <span class="value">${archLabel[d.key]}</span></div>
+        <div><span class="label">Epoch:</span> <span class="value">${clamped}</span></div>
+        <div><span class="label">Active miners:</span> <span class="value">${count}</span></div>
+        <div><span class="label">Share:</span> <span class="value">${pct}%</span></div>
+        <div><span class="label">Total this epoch:</span> <span class="value">${total} miners</span></div>
+        <div><span class="label">RTC mined:</span> <span class="value">${row.totalRTC.toFixed(2)}</span></div>
+      `;
+
+      d3.select(this).attr('opacity', 1);
+    })
+    .on('mouseleave', function() {
+      document.getElementById('tooltip').style.display = 'none';
+      d3.select(this).attr('opacity', 0.85);
+    });
+
+  // Epoch settlement markers (every 25 epochs)
+  for (let e = 0; e < rawData.length; e += 25) {
+    g.append('line')
+      .attr('class', 'epoch-line')
+      .attr('x1', x(e)).attr('x2', x(e))
+      .attr('y1', 0).attr('y2', h);
+  }
+
+  // First appearance markers
+  const firstAppear = {};
+  archKeys.forEach(k => {
+    const idx = rawData.findIndex(r => (r[k] || 0) > 0);
+    if (idx >= 0) firstAppear[k] = idx;
+  });
+  Object.entries(firstAppear).forEach(([k, idx]) => {
+    if (idx > 0) {
+      g.append('text')
+        .attr('class', 'first-appear')
+        .attr('x', x(idx))
+        .attr('y', -5)
+        .text(`↓ ${archLabel[k]}`);
+    }
+  });
+
+  // Axes
+  const xAxis = d3.axisBottom(x).ticks(10).tickFormat(d => `Epoch ${d}`);
+  g.append('g').attr('transform', `translate(0,${h})`).call(xAxis)
+    .selectAll('text,line,path').attr('stroke', '#665e4a').attr('fill', '#665e4a');
+
+  const yAxis = mode === 'normalized'
+    ? d3.axisLeft(y).ticks(5).tickFormat(d3.format('.0%'))
+    : d3.axisLeft(y).ticks(8);
+  g.append('g').call(yAxis)
+    .selectAll('text,line,path').attr('stroke', '#665e4a').attr('fill', '#665e4a');
+}
+
+// Control buttons
+document.querySelectorAll('#controls button').forEach(btn => {
+  btn.addEventListener('click', () => {
+    document.querySelectorAll('#controls button').forEach(b => b.classList.remove('active'));
+    btn.classList.add('active');
+    currentMode = btn.dataset.mode;
+    render(currentMode);
+  });
+});
+
+render('stacked');
+window.addEventListener('resize', () => render(currentMode));
+</script>
+</body>
+</html>
