Evidence row 28951

What was observed

{
  "endpoints": [
    [
      "web",
      "https://www.archelps.com/"
    ]
  ],
  "name": "Arc Skills",
  "owner_address": null,
  "raw": {
    "_meta": {
      "io.modelcontextprotocol.registry/official": {
        "isLatest": true,
        "publishedAt": "2026-10-17T06:28:20.435384Z",
        "status": "active",
        "statusChangedAt": "2026-10-17T06:28:20.435384Z",
        "updatedAt": "2026-10-17T06:28:20.435384Z"
      }
    },
    "server": {
      "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
      "description": "100 systems and hardware engineering skills for requirements, interfaces, budgets and verification.",
      "name": "io.github.JoshElgar/arc-skills",
      "packages": [
        {
          "environmentVariables": [
            {
              "description": "Absolute path to an existing dedicated folder for inputs and new outputs; do not use your home directory.",
              "format": "filepath",
              "isRequired": true,
              "name": "ARC_ENGINEERING_WORKSPACE"
            }
          ],
          "identifier": "arc-engineering-mcp",
          "packageArguments": [
            {
              "type": "positional",
              "value": "arc-engineering"
            },
            {
              "type": "positional",
              "value": "serve"
            }
          ],
          "registryBaseUrl": "https://pypi.org",
          "registryType": "pypi",
          "runtimeArguments": [
            {
              "type": "positional",
              "value": "--no-config"
            },
            {
              "name": "--from",
              "type": "named",
              "value": "arc-engineering-mcp==0.2.0"
            }
          ],
          "runtimeHint": "uvx",
          "transport": {
            "type": "stdio"
          },
          "version": "0.2.0"
        }
      ],
      "repository": {
        "source": "github",
        "url": "https://github.com/ArcHelps/systems-engineering-skills"
      },
      "title": "Arc Skills",
      "version": "0.2.0",
      "websiteUrl": "https://www.archelps.com/"
    }
  },
  "source": "mcp_registry",
  "summary": "100 systems and hardware engineering skills for requirements, interfaces, budgets and verification."
}

What the leaf hashes

{"body":"8e1a9385bc1eed4c9a090b29fcb925f2c9c90dde8bd759265a5659b576901079","id":28951,"kind":"listing","method":"baseline/1","observed_us":1793025360389909,"prev":null,"subject":"mcp_registry:io.github.JoshElgar/arc-skills","subject_kind":"source_record"}

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. 0x732a6011af146243030b25310c9e8119e90409e1bc28f3b682cba316872b92ce
2. 0x3f70e98c2af0508a6cd4333358872de8f119c962c0bd191c19bd18bf22ffbdb8
3. 0x0bec10578fa7b1636c2f144893396b94a73567d95d88206932ef4d9d508c29ca
4. 0xa3a6a295e66df6081f65b8493028405b7d29fbe9ce5ff4ef26ea79d6c3925eb8
5. 0x818c8c44442b2d163840d447ad981e5864c9a188463119bd424414baacbd8680
6. 0x7ddb1d26ccac67f93e7e544d4c838c77836618a077f0ee5c6c9a321897c20f19
7. 0x5a83724c07bcc33e302fb23acaf38f154d199203a1ac5a03cecc2267571ed000
8. 0xe560fa2464c3376570e5208af326ce5335887554aa9532442545cdfd7c784080
9. 0x6423b6b4c84704ed195c7ae71a3365d748f95993ce7ce76b600f785d88b9eddd
10. 0xc2fcd11ef5af6a59df481070e310192a7ac0d719b88489223003ed02d68e2c79
11. 0x4ad1cba264cd30b4cce9fb7c52897b51c3d91649c3d00e37d10c56aed923e338
12. 0x3f193b47c78cf4e7b9e4988cd716854b0e1011e5fcbca161f5a885f1aa02857d
13. 0x06064dc1eb2363bec8c2a752e0a28aafc4bf0cb21d1b1b755821c1575bb77a96
14. 0xc4fe2177880ea1b0e82b6fe4c270090fd0fbe5af3a42a8cbf6a6ba2fa35625f6
15. 0x15039087bf60ae9b06b756ec3cbc299760e59923a438bbd91e34d105186db0ed
16. 0x2b6e23e3624a1b66e1d2298cfbce99a93ce6b13d24a58112a71802d79c5f7a76
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae