Evidence row 221936

What was observed

{
  "count": 4,
  "tools": [
    {
      "description": "Compare 2–8 certification exams side by side — price, duration, passing score, question count, and domain count. Call for 'X vs Y', 'which is harder/cheaper', 'easiest cloud cert', 'CCNA vs Network+'. Accepts exam ids, codes, or names; each row links a free practice exam.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "exams": {
            "description": "2–8 exam ids, codes, or names to compare",
            "items": {
              "type": "string"
            },
            "maxItems": 8,
            "minItems": 2,
            "type": "array"
          }
        },
        "required": [
          "exams"
        ],
        "type": "object"
      },
      "name": "compare_exams"
    },
    {
      "description": "Get the full published blueprint for ONE certification exam: domain/objective breakdown with topic weights, passing score, question count & types, duration, price, prerequisites, retake & renewal policy, languages, and the official source URL. Reviewed records also include an exam overview, audience, preparation guidance, aggregate study signals, and source verification. Call this for 'what's on the X exam', 'how is X weighted by domain', 'prerequisites for X', 'passing score for X', 'how long is X'. Accepts an exam_id, exam_code, or certification name. Includes a free practice-exam link.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "exam": {
            "description": "Exam id, exam code, or certification name",
            "type": "string"
          }
        },
        "required": [
          "exam"
        ],
        "type": "object"
      },
      "name": "get_exam_blueprint"
    },
    {
      "description": "List the certifying bodies / vendors in the current Cert Atlas index with exam counts. Call for 'what certification providers/vendors are covered', 'how many AWS/Microsoft/Cisco certs'. Optionally filter by a substring.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "contains": {
            "description": "Optional substring filter on the body name, e.g. 'micro', 'aws'",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "list_certifying_bodies"
    },
    {
      "description": "Search the current Cert Atlas certification and professional exam index by name, code, certifying body, or vendor. Call this whenever a user mentions a certification or exam — e.g. AWS Solutions Architect, CISSP, CompTIA Security+, PMP, CCNA, NCLEX, CFA, Azure AZ-104, CKA — or asks what certs a body offers. Returns matching exams with code, certifying body, question count, domain count, and a free practice-exam link.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "certifying_body": {
            "description": "Filter by certifying body, e.g. 'AWS', 'CompTIA', 'ISC2', 'Microsoft'",
            "type": "string"
          },
          "limit": {
            "description": "Max results (default 20)",
            "maximum": 50,
            "minimum": 1,
            "type": "integer"
          },
          "query": {
            "description": "Keywords: certification name, exam code, vendor, or topic",
            "type": "string"
          },
          "vendor_slug": {
            "description": "Filter by vendor slug, e.g. 'aws', 'microsoft', 'comptia'",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "search_exams"
    }
  ]
}

What the leaf hashes

{"body":"e39d92265e3be7474e2d1a8a7c5bbed84e972765de77ff8f6097ea3083d450f0","id":221936,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793027707960573,"prev":null,"subject":"8c459c58-24bc-4743-ab4c-78ef9f9acd6b","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0xd09f2edc32381d30e9b354efde27407745f5261e8679b31bfdfc2cb2ead45cb1
2. 0x9488b9b2b66ca2e365b70e4e0ebf0a28b3b924fb51b5b03dcaa80447389a8026
3. 0x5ec59bf8cf17649a3a655cbc6cf214edb361ffaee9627e2deff2156e73e8cc5d
4. 0x2d8cf4c459c97597225d3237b33d055a4664b9893bd009313c43835c6d63fc67
5. 0x5a71ace9abf1a5ebb277b948773bbf53ca250b903d562c64a254f29ef03fb855
6. 0xaa58de17c8292ed1258fe45403ea3195f1995719dfb46e95cc4895bc0a17656f
7. 0x478552f140494a8388f92a179cffcc45c7355aec713f4ee7fc947bf254edbdfa
8. 0x821c400cc4fd4406338c8fa6bf5ca213aaa065b553209b9668116eb55b5db853
9. 0xa0d616381ed0c5c291a07abe0af20c8c7fbe3ccaa464a8d253b56a1b36373a26
10. 0x0f53b93a25a2f186fd221bd4e152ef492b0cc841c0b870210a5fd6038ba3602e
11. 0xcbb746ffeda31ff1f1b0d9f74705fed23a3c2abac5d325d65e8e867a7b5e6307
12. 0xa4ec009cd8db00b48fa2e4df84088950b4d34c37254de09f5e3789441c0c5e73
13. 0x889eefefef2d4457fe6114f397df813a5cbb85011a6f40309b54ddcd4aba3bd1
14. 0xefabf1105e09cf52c12c58e60cbb5048b9ac3f02631d1816a926e14bdd86fbdf
15. 0xe94ca5b798e9899ad611e57835af42266e20f53f44977e487d81365e30972beb
16. 0x703f95866af09c5e5d6ead7411e9a10f964a41a2aff64d4a55ff0053c023a023
17. 0xd0651cb9bc8155eb52b5247d506e74b8a935057dc190ba52091702ac25ed3a40
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae