{
  "bundle_id": "cain42-convergence-fabric-public-evidence",
  "bundle_version": "1.0.0",
  "generated_at": "2026-09-18T05:30:00Z",
  "title": "CAIN 42.0 Convergence Fabric -- Public Evidence Bundle",
  "purpose": "Closes three gaps every prior CAIN 37-41 session explicitly declared NOT ATTEMPTED: a real MCP integration (official SDK, real server, real trust gate), a real A2A integration (self-implemented per the public spec, real trust gate), and a real, independently-recomputable supply-chain provenance manifest. Also includes a real (small-scale, honest) demonstration that agent collusion can defeat plain-majority collective decisions, and that CAIN's existing quorum-threshold mechanism is a genuine, working mitigation.",
  "how_to_verify_independently": "See HOW_TO_VERIFY.md, dogfooded end-to-end in a clean directory before publishing.",
  "honest_scope_note": "MCP and A2A integrations were tested against ONE local, self-hosted server/agent each, not the wild ecosystem. The A2A demo agent is this session's own implementation of the public message shapes (no official Python A2A SDK exists yet). The agent-collusion demonstration uses 20 scripted agents, not the mission's 10,000+-agent campaign. See CAIN_42_LIMITATIONS.md for the full accounting.",
  "artifacts": [
    {"filename": "cain_mcp_demo_server_42.py", "sha256": "50ede5a34248da586421fa98f1f79fec9cf898f36e962e48dc629cc000d6d783", "description": "A real MCP server built on the official `mcp` SDK v2.2.0."},
    {"filename": "cain_a2a_demo_agent_42.py", "sha256": "ea1c6d5a87692db2ff9e57196a9aa0f032c6bf27cfe4e33546966913f89d93fa", "description": "This session's own real implementation of the public A2A message shapes (Agent Card + message/send JSON-RPC)."},
    {"filename": "cain42_mcp_chain.jsonl", "sha256": "43bab2d756bec36988dbabf2d11ca6530555656208b60f6759833f11fab6a468", "description": "1 real MCP_TOOL_INVOCATION evidence object from a live DISCOVER->TRUST->AUTHORIZE->EXECUTE round trip.", "classification": "LIVE-VERIFIED"},
    {"filename": "cain42_mcp_checkpoints.jsonl", "sha256": "7f34a2c57eb438bf90a419261a4d39a6322f1c9661e0805f311c600959e7459c", "description": "Merkle checkpoint over the MCP chain."},
    {"filename": "cain42_a2a_chain.jsonl", "sha256": "74a17e9edaebf790eb72988725eb4d9f977affa085729abb1debe5cffe5ab616", "description": "1 real A2A_TASK_INVOCATION evidence object from a live DISCOVER->TRUST->AUTHORIZE->EXECUTE round trip.", "classification": "LIVE-VERIFIED"},
    {"filename": "cain42_a2a_checkpoints.jsonl", "sha256": "b8869c347beaee07916341805544d0a102531ec6fdde1320554fe1661134e71a", "description": "Merkle checkpoint over the A2A chain."},
    {"filename": "cain42_provenance_manifest.json", "sha256": "b593785ac0a30c3c6531f69ba8cb5cc0ebffe98d8156f5186325d15bbdef2d20", "description": "Signed supply-chain provenance manifest; 3 of 4 links independently recomputable from a repo checkout, 1 honestly marked ATTESTED not VERIFIED."},
    {"filename": "cain_37_independent_verifier.py", "sha256": "0b3e74e6227ca1de8046beccb879362ff06817cfd1fb0e74b16dc3af8c8c9512", "description": "Reused unmodified across CAIN 37-42 -- zero-import."},
    {"filename": "cain_42_provenance_verifier.py", "sha256": "dc14039a748e1ad75ed9d29a011a8cea01a2b6dab92720f247e420761f80f340", "description": "Zero-import provenance verifier -- recomputes hashes from your OWN checkout, never trusts a stored claim."}
  ],
  "related_finding_not_in_this_bundle_as_a_file": "The agent-collusion demonstration (12 colluding vs 8 honest agents, majority rule defeated, quorum-0.70 rule wins) is real, tested code (tests/test_cain42_agent_collusion.py, 4/4 pass) but produces no new evidence chain of its own -- it exercises cain_organization_40.evaluate_collective_decision() directly. See CAIN_42_CLAIM_MATRIX.json for the exact reproduction."
}