Evidence row 814628

What was observed

{
  "count": 6,
  "tools": [
    {
      "description": "List past GATE Daily questions whose solutions are public (each question is, from the day after its set), newest first. Filter by GATE CS subject or by topic words to drill one area; open one with get_question.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "limit": {
            "description": "How many to list; 20 if left out.",
            "maximum": 50,
            "minimum": 1,
            "type": "integer"
          },
          "subject": {
            "description": "Subject code: ga = General Aptitude, em = Engineering Mathematics, dm = Discrete Mathematics, dl = Digital Logic, coa = Computer Organization & Architecture, pds = Programming & Data Structures, algo = Algorithms, toc = Theory of Computation, cd = Compiler Design, os = Operating Systems, dbms = Databases, cn = Computer Networks.",
            "enum": [
              "ga",
              "em",
              "dm",
              "dl",
              "coa",
              "pds",
              "algo",
              "toc",
              "cd",
              "os",
              "dbms",
              "cn"
            ],
            "type": "string"
          },
          "topic": {
            "description": "Words to find in the topic name, e.g. \"paging\" or \"normal forms\".",
            "maxLength": 80,
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "browse_questions"
    },
    {
      "description": "Get a GATE Daily practice set: ten original GATE CS & IT questions in the exam's format (MCQ, MSQ, NAT; 1 and 2 marks; GATE negative marking), published every day at 00:00 IST. Returns the questions without answers. Use it when the user wants to practise for GATE CS, solve questions, or keep a daily study habit. Leave out date for today's set.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "date": {
            "description": "A past set's date, YYYY-MM-DD (IST). Leave out for today's set.",
            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "get_daily_set"
    },
    {
      "description": "The signed-in user's GATE Daily record: streak, sets submitted, accuracy, correct answers by subject (weakest first) and recent scores. Use it to see where they stand, what to revise, or whether today's set is done.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {},
        "type": "object"
      },
      "name": "get_my_progress"
    },
    {
      "description": "Get one past GATE Daily question together with its answer, worked solution, note to remember and why each option is right or wrong.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "slug": {
            "description": "The question's slug from browse_questions, e.g. \"2026-10-26-books-on-shelf-two-forbidden-positions\".",
            "maxLength": 160,
            "type": "string"
          }
        },
        "required": [
          "slug"
        ],
        "type": "object"
      },
      "name": "get_question"
    },
    {
      "description": "Get one of the day's two GATE Daily subject sets: five original GATE CS questions on one subject, a deeper rep than the mixed daily set. For signed-in users (free); without a GATE Daily sign-in this asks the user to connect their account. Leave out subject to see the day's choice. Returns the questions without answers; submit with submit_answers and the subject.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "date": {
            "description": "A past day's date, YYYY-MM-DD (IST). Leave out for today's.",
            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
            "type": "string"
          },
          "subject": {
            "description": "Subject code of the set; leave out to list the day's sets.",
            "enum": [
              "ga",
              "em",
              "dm",
              "dl",
              "coa",
              "pds",
              "algo",
              "toc",
              "cd",
              "os",
              "dbms",
              "cn"
            ],
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "get_subject_set"
    },
    {
      "description": "Score the user's answers to a GATE Daily set the way GATE does (a wrong MCQ costs 1/3 or 2/3 of its marks; MSQ and NAT have no negative marking and no partial credit) and get the answer, worked solution and a note to remember for every question. Call it once, after the user has answered; questions left out count as skipped. For a signed-in user the set is saved to their record (the first submission of a set stays).",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "answers": {
            "additionalProperties": {
              "anyOf": [
                {
                  "type": "string"
                },
                {
                  "type": "number"
                },
                {
                  "items": {
                    "type": "string"
                  },
                  "type": "array"
                }
              ]
            },
            "description": "Question number to answer: an option letter for MCQ (\"b\"), every chosen letter for MSQ ([\"a\",\"c\"]), a number for NAT (\"12.5\").",
            "propertyNames": {
              "type": "string"
            },
            "type": "object"
          },
          "date": {
            "description": "The set's date, YYYY-MM-DD, as get_daily_set or get_subject_set returned it.",
            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
            "type": "string"
          },
          "subject": {
            "description": "For a subject set: its subject code, as get_subject_set returned it. Leave out for the daily set.",
            "enum": [
              "ga",
              "em",
              "dm",
              "dl",
              "coa",
              "pds",
              "algo",
              "toc",
              "cd",
              "os",
              "dbms",
              "cn"
            ],
            "type": "string"
          },
          "times": {
            "additionalProperties": {
              "type": "number"
            },
            "description": "Milliseconds spent per question, when known (the quiz card sends it).",
            "propertyNames": {
              "type": "string"
            },
            "type": "object"
          }
        },
        "required": [
          "date",
          "answers"
        ],
        "type": "object"
      },
      "name": "submit_answers"
    }
  ]
}

What the leaf hashes

{"body":"51cf260c46252dddfea5f25e8381ff92609108d09759de5c2f9e40f2ad47c845","id":814628,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793229794629880,"prev":null,"subject":"f8c92c96-73aa-44b4-bfa9-fb6be542dc8b","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-28 (231336 rows).

1. 0x0eefaf1774713100b341ebfaee61c3fe3eaf9e73835ce9f15b4c11538dfdf291
2. 0x765785919a2a48ac38077a6418e8d6fe4742609b3f6905479593fe969eaadc21
3. 0x13a68377ac071c8e01ea3810ca439c94b5c358d38a6b31de72ad7602a575ceb7
4. 0xe50b1c421e605eaffbd2d1bfbd1ae2810d9b6880a33474669f5699bca5f1fe00
5. 0x4bcffcc06239706a27cf219ec3d1fb09c68fd88a974b584e50758a814a8ad786
6. 0x562914868fa5c34b2ef7149314ec2dd40ef9d697d97fe8d44d907baaa6422ac1
7. 0xf76a29a13ce7ac30dcb15b346147e896754a4c522fff8bd55dc8b4db2eb49175
8. 0xfc7e9dc7c6037cd5e6744ebe6c0b80827b204a76073bf37d6a44221ead14f285
9. 0x35e127ee2c9fa4e320d8f5073152f7e464259033c5ff2189d2ff105dda39053c
10. 0x074950f0e8fb7e03187edf4384d2626ffd32ed5f1828d6785209f28f6516b4e8
11. 0x702458b3edf6d506b580474c51822cc9b75829b711968165ca7d822be2793092
12. 0x60467e72ee1c7e1a625989cc84742be5994ca41aa97557ccf246ec0f902a4228
13. 0xfd1df77ed593d89e10dbf20c0bb022fdc7c5fff3d41d686683936ce3d2b0638c
14. 0xd255034c045ff2574d11cb3757ffb240536c7380f2dfbe54e8a41bd8797bd254
15. 0x2d4bed6c1c0f427d29eba935cdedcc76c72935d41919903a3b217a8ffca38438
16. 0x35e8995c30094446ec790423171382fccb377081b921295b0ae3840cc2c4f52c
17. 0xf078ea7d84d98dbeffed23d8e67b36751e60464ffd4cfdc005e0aa6f8cb9b459
18. 0xe027395fafb7fc41921c42ca0542524ea22204cbd5908b70b27f3d5fb26f5d0f

Day root

0x2c19037464cc4c493624565f01775d6446fc78eaa118fc6865bfe2bfca9ff78e

Chained

0xd1d7dee8322ceff8f4c8d83aa1fe4a4466825c2af1c97dbde3d35db61234f7be

Published

On Arc Testnet, block 69584042: 0x8bae2b1d097834c8b458513862d70d29ee807e98dc2e863b27250131c15b35ae