Evidence row 38572

What was observed

{
  "endpoints": [
    [
      "web",
      "https://mailsnail.dev/"
    ]
  ],
  "name": "io.github.iancollins27/mailsnail",
  "owner_address": null,
  "raw": {
    "_meta": {
      "io.modelcontextprotocol.registry/official": {
        "isLatest": true,
        "publishedAt": "2026-07-15T17:30:08.609852Z",
        "status": "active",
        "statusChangedAt": "2026-07-15T17:30:08.609852Z",
        "updatedAt": "2026-07-15T17:30:08.609852Z"
      }
    },
    "server": {
      "$schema": "https://static.modelcontextprotocol.io/schemas/2025-09-29/server.schema.json",
      "description": "Send USPS letters, postcards & certified mail from any agent. No signup; pay-per-piece via Stripe.",
      "name": "io.github.iancollins27/mailsnail",
      "packages": [
        {
          "environmentVariables": [
            {
              "default": "managed",
              "description": "Where to mail from: 'managed' (default, no signup, pay-per-piece via Stripe), 'click2mail' (BYO account), or 'lob' (BYO key).",
              "isRequired": true,
              "name": "MAIL_PROVIDER"
            },
            {
              "default": "https://api.mailsnail.dev",
              "description": "Hosted Mailsnail backend. Required when MAIL_PROVIDER=managed.",
              "name": "MAIL_API_BASE_URL"
            },
            {
              "description": "Click2Mail account username. Required when MAIL_PROVIDER=click2mail.",
              "name": "CLICK2MAIL_USERNAME"
            },
            {
              "description": "Click2Mail account password. Required when MAIL_PROVIDER=click2mail.",
              "isSecret": true,
              "name": "CLICK2MAIL_PASSWORD"
            },
            {
              "description": "Lob API key. Required when MAIL_PROVIDER=lob. test_* is free; live_* actually mails.",
              "isSecret": true,
              "name": "LOB_API_KEY"
            },
            {
              "default": "0",
              "description": "Set to '1' to actually mail in BYOK modes. Default '0' is dry-run.",
              "name": "MAIL_MCP_ALLOW_LIVE"
            },
            {
              "default": "25",
              "description": "Per-session estimated spend cap. Server refuses sends past this.",
              "name": "MAIL_MCP_SPEND_CAP_USD"
            }
          ],
          "identifier": "mailsnail",
          "registryBaseUrl": "https://registry.npmjs.org",
          "registryType": "npm",
          "transport": {
            "type": "stdio"
          },
          "version": "0.6.0"
        }
      ],
      "repository": {
        "source": "github",
        "url": "https://github.com/iancollins27/mailsnail"
      },
      "version": "0.6.0",
      "websiteUrl": "https://mailsnail.dev"
    }
  },
  "source": "mcp_registry",
  "summary": "Send USPS letters, postcards & certified mail from any agent. No signup; pay-per-piece via Stripe."
}

What the leaf hashes

{"body":"fe6225c08c0a0c7fee020a69d092b75d4c7e7bbea7b071cb7b5020e709977cc6","id":38572,"kind":"listing","method":"baseline/1","observed_us":1793025392919233,"prev":null,"subject":"mcp_registry:io.github.iancollins27/mailsnail","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. 0xc3fc162be8c5ad21fa31ffe2dddb7f822b100d842ad4b2b2cf0976ec6c975af4
2. 0x391d91007445f3057d541db228e6e9c897dce776b969d49a17b458fcabc0331c
3. 0xcbbe8a3fb5c0ce37d75c77e22f6febb45599f1b09fcda331037805cfb14ab927
4. 0xecd39b822aaae01af5a614c4b8b7e95079666bb7b68a1ea928cd0b43fe56e443
5. 0xd257bb6e6735fc0a0c5b6c4a31c73bf43694e82c6c8805445bc6c5ea100a24a6
6. 0xbe20c8ff64a5ee8cef1bfc6f86fc38af8a1bf0f8297b4ff9adc31559279a676d
7. 0x94bd147c76c0ea24ffb4b13ff1f6ad7e5130ae7730c5ab0f9fe45fdbdaf5646b
8. 0xda0ec7cdd945a045d2128a95bae007d3dfe6bdec78f95b708b1a7b6f29060d9b
9. 0xb27d4aa33f64f45fa7d713149f17d13b2ee30393cc7a102b9a52040296e5cde5
10. 0xdc850e305944c852a3843d2749ca3439ee04fdbf864b6a8660cc3fd8b5aced96
11. 0x2cd92a66ffb802d7ebc327d20fe07925be80289ee1c2910e6818dc40c67f2487
12. 0x63002f2569d43725bbf2d04d90ec9e6cf925c96b6dda5e7e220ecfbdd9c2444d
13. 0x641fba1f23ec69d96721e34ace1926954d835b9614cb5eae215a069c056399b8
14. 0xdbe2e8dd65ea1248b2936612538f18268abd5cf27ebdab3737694571ad496004
15. 0x9f68b5e15459cb62b8c0cd4c124fa61c74147b4a5755a200fbecd21a581635d1
16. 0x123ec8bee20ddc55223eeef5a4f4d6c4b6416515adbb911c56759f5cde56e452
17. 0xd0651cb9bc8155eb52b5247d506e74b8a935057dc190ba52091702ac25ed3a40
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae