{
  "schema": "com.catellix.mvps.pcap_receipt_v1",
  "generated_at_utc": "2026-05-25T16:56:20.918457+00:00",
  "wire_format": {
    "linktype": "LINKTYPE_ETHERNET (1)",
    "transport": "UDP",
    "udp_dst_port": 3784,
    "udp_src_port": 49152,
    "ip_src": "203.0.113.10",
    "ip_dst": "203.0.113.20",
    "coherence_magic_hex": "0x434F4845",
    "coherence_magic_ascii": "COHE",
    "payload_layout_bytes": [
      {
        "offset": 0,
        "len": 32,
        "field": "BFD V3 control header (RFC 5880 layout)"
      },
      {
        "offset": 32,
        "len": 4,
        "field": "Coherence Magic (0x434F4845)"
      },
      {
        "offset": 36,
        "len": 4,
        "field": "Tick ID k"
      },
      {
        "offset": 40,
        "len": 4,
        "field": "Phase residual phi (signed ns)"
      },
      {
        "offset": 44,
        "len": 4,
        "field": "C1 causal (float32)"
      },
      {
        "offset": 48,
        "len": 4,
        "field": "C2 semantic (float32)"
      },
      {
        "offset": 52,
        "len": 4,
        "field": "C3 byzantine (float32)"
      },
      {
        "offset": 56,
        "len": 12,
        "field": "HMAC-SHA256 truncated 96 bits"
      }
    ],
    "total_payload_bytes": 68,
    "hmac_key_ascii": "MVPS-shared-secret-deterministic-2026",
    "note": "HMAC key is deterministic and public ONLY to make these captures reproducible.  Production deployments rotate this key."
  },
  "files": [
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      "coherence_magic_ascii": "COHE",
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      "dst_ip": "203.0.113.20",
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      ]
    },
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          "c2": 0.55871,
          "c3": 0.40468,
          "frame_len": 110,
          "payload_sha256_first12": "60e316aa1dfd"
        },
        {
          "index": 29,
          "ts_unix": 1780001029.45,
          "tick_k": 100029,
          "phi_ns": 124354,
          "c1": 0.45441,
          "c2": 0.48392,
          "c3": 0.33043,
          "frame_len": 110,
          "payload_sha256_first12": "b7fe0ea4acb2"
        }
      ]
    }
  ],
  "validation": {
    "open_in_wireshark": "wireshark mvps_baseline.pcap",
    "tcpdump_hexdump": "tcpdump -X -nn -r mvps_baseline.pcap",
    "extract_payload": "tshark -r mvps_baseline.pcap -T fields -e data | head -1",
    "search_magic": "tshark -r mvps_baseline.pcap -Y 'data contains 43:4f:48:45'",
    "expected_finding": "Each frame is Ether(IPv4 + UDP dst=3784 + 68-byte Coherence-BFD payload).  At payload offset 32 you will see 4 bytes spelling 'COHE' (0x43 0x4f 0x48 0x45) \u2014 that is the magic that marks an MVPS-aware peer."
  },
  "interpretation": "These are real libpcap files containing fully-formed MVPS Coherence-BFD packets on the wire.  Any reviewer can drop them into Wireshark and verify byte-for-byte that the wire format matches Draft D-3.  In the DDoS capture, the per-packet rate is the same as baseline, but the (phi, C1, C2, C3) coherence vector blows up \u2014 which is exactly the broker-side signal MVPS uses to fire D^2 (Theorem D-4)."
}