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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Provenance Tracking (W3C PROV-O)\n",
+    "\n",
+    "## Overview\n",
+    "\n",
+    "In high-stakes domains — healthcare, legal, finance, research — a Knowledge Graph is only as trustworthy as its ability to answer **\"where did this fact come from?\"**. Semantica's `provenance` module provides audit-grade, W3C PROV-O-aligned tracking for every entity, relationship and chunk that flows through your pipeline.\n",
+    "\n",
+    "In this cookbook you will learn how to:\n",
+    "\n",
+    "- Track entities and relationships with **source details** (DOI, page, verbatim quote, confidence)\n",
+    "- Walk the full **lineage** of a fact (document → chunk → entity → KG)\n",
+    "- Audit **revision history** and **all sources** behind an entity\n",
+    "- **Invalidate** a fact without deleting it (prov:Invalidation) — corrections stay provable\n",
+    "- Verify **tamper-evidence** with chained SHA-256 checksums\n",
+    "\n",
+    "**The Scenario:** a research team ingests findings from two scientific papers (with DOIs) into a Knowledge Graph. A regulator later asks: *\"Which paper, which figure, and which exact sentence supports the claim that fish biomass increased by 463%? And was that fact ever corrected?\"*"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "!pip install -q semantica"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import json\n",
+    "from semantica.provenance import (\n",
+    "    ProvenanceManager,\n",
+    "    compute_checksum,\n",
+    "    verify_checksum,\n",
+    ")\n",
+    "\n",
+    "# In-memory storage for this demo; pass storage_path=\"provenance.db\"\n",
+    "# (or a config with provenance.storage_path) for a persistent SQLite backend.\n",
+    "prov = ProvenanceManager()\n",
+    "print(\"ProvenanceManager ready (in-memory storage)\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Step 1: Track Entities with Audit-Grade Source Details\n",
+    "\n",
+    "Every fact we ingest carries its evidence with it: the **source identifier** (a DOI here), the **location** inside the source (a figure), the **verbatim quote**, and the extractor's **confidence**."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Finding from paper #1\n",
+    "entry_biomass = prov.track_entity(\n",
+    "    entity_id=\"claim_biomass_increase\",\n",
+    "    source=\"DOI:10.1371/journal.pone.0023601\",\n",
+    "    confidence=0.92,\n",
+    "    source_location=\"Figure 2\",\n",
+    "    source_quote=\"Total fish biomass increased by 463% ...\",\n",
+    ")\n",
+    "\n",
+    "# Supporting entity from paper #2\n",
+    "entry_reserve = prov.track_entity(\n",
+    "    entity_id=\"marine_reserve_1\",\n",
+    "    source=\"DOI:10.1126/science.1088121\",\n",
+    "    confidence=0.88,\n",
+    "    source_location=\"Table 1\",\n",
+    "    source_quote=\"... no-take marine reserve at Cabo Pulmo ...\",\n",
+    ")\n",
+    "\n",
+    "print(\"Tracked:\", entry_biomass.entity_id, \"|\", entry_reserve.entity_id)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Step 2: Track the Relationship Between Facts\n",
+    "\n",
+    "Facts rarely stand alone. The claim about biomass increase is *about* the marine reserve — that relationship is a first-class provenance-tracked object too."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "rel = prov.track_relationship(\n",
+    "    relationship_id=\"rel_biomass_about_reserve\",\n",
+    "    source=\"DOI:10.1371/journal.pone.0023601\",\n",
+    "    metadata={\"type\": \"measured_at\"},\n",
+    ")\n",
+    "\n",
+    "print(\"Relationship tracked:\", rel.entity_id)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Step 3: Walk the Lineage\n",
+    "\n",
+    "`get_lineage` reconstructs everything known about a fact; `trace_lineage` returns the ordered chain of `ProvenanceEntry` records — every version, every activity, every agent that touched it."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "lineage = prov.get_lineage(\"claim_biomass_increase\")\n",
+    "print(json.dumps(lineage, indent=2, default=str)[:800])\n",
+    "\n",
+    "print(\"\\n--- ordered chain ---\")\n",
+    "for e in prov.trace_lineage(\"claim_biomass_increase\"):\n",
+    "    print(f\"{e.entity_id} | v{getattr(e, 'version', '?')} | {e.activity_id}\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Step 4: Audit Sources and Revision History\n",
+    "\n",
+    "When the regulator asks *\"has this fact ever been corrected?\"*, `revision_history` answers with the full version chain, and `get_all_sources` lists every source document that ever supported the entity."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "revisions = prov.revision_history(\"claim_biomass_increase\")\n",
+    "print(f\"{len(revisions)} revision(s) on record\")\n",
+    "\n",
+    "for s in prov.get_all_sources(\"claim_biomass_increase\"):\n",
+    "    print(\"source:\", s)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Step 5: Invalidate — Correct Without Deleting\n",
+    "\n",
+    "Suppose paper #1 is retracted in part. An audit trail must **not** silently delete the fact: `invalidate` archives the pre-invalidation state and appends a fresh `prov:Invalidation` entry naming **who** retracted it and **why**."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "invalidated = prov.invalidate(\n",
+    "    entity_id=\"claim_biomass_increase\",\n",
+    "    agent_id=\"reviewer_dr_chen\",\n",
+    "    reason=\"Partial retraction: Figure 2 statistics corrected by publisher (see erratum).\",\n",
+    ")\n",
+    "print(\"Invalidated:\", invalidated.entity_id, \"| invalidated flag:\", getattr(invalidated, \"invalidated\", True))\n",
+    "\n",
+    "stats = prov.get_statistics()\n",
+    "print(\"\\nStorage statistics:\", json.dumps(stats, indent=2, default=str))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Step 6: Verify Tamper-Evidence\n",
+    "\n",
+    "Each entry carries a deterministic SHA-256 checksum chained to the previous entry. Recompute and compare to detect any after-the-fact corruption of the provenance record."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# entry_biomass was returned by track_entity in Step 1\n",
+    "ok = verify_checksum(entry_biomass)\n",
+    "print(\"Checksum verified:\", ok)\n",
+    "\n",
+    "print(\"Computed:\", compute_checksum(entry_biomass)[:16], \"...\")\n",
+    "print(\"Stored:  \", entry_biomass.checksum[:16] if getattr(entry_biomass, 'checksum', None) else \"(see entry fields)\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Summary\n",
+    "\n",
+    "| Need | Call |\n",
+    "|---|---|\n",
+    "| Record a fact's evidence | `prov.track_entity(entity_id, source, confidence=..., source_location=..., source_quote=...)` |\n",
+    "| Record a relationship | `prov.track_relationship(relationship_id, source, metadata=...)` |\n",
+    "| Full lineage of a fact | `prov.get_lineage(entity_id)` / `prov.trace_lineage(entity_id)` |\n",
+    "| \"Was it ever corrected?\" | `prov.revision_history(entity_id)` |\n",
+    "| \"Which sources support it?\" | `prov.get_all_sources(entity_id)` |\n",
+    "| Retract without deleting | `prov.invalidate(entity_id, agent_id, reason=...)` |\n",
+    "| Tamper check | `verify_checksum(entry)` |\n",
+    "\n",
+    "### Where to go next\n",
+    "\n",
+    "- **Conflict Detection and Resolution** (notebook 17) — what happens when two sources disagree.\n",
+    "- **Your First Knowledge Graph** (notebook 08) — plug `provenance=True` into extractors so tracking happens automatically during ingestion.\n",
+    "- The module docstring (`help(semantica.provenance)`) documents opt-in integration with `kg`, `split` and `conflicts` trackers."
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "name": "python",
+   "version": "3.11"
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