Evidence row 123377

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://underground.substratesymposium.com/api/merchant-key"
    ]
  ],
  "name": "underground.substratesymposium.com/api/merchant-key",
  "owner_address": "0xa3babb36564b0383a82c617050306ee30fd18e08",
  "raw": {
    "accepts": [
      {
        "amount": "1000000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xA3bAbB36564b0383a82c617050306EE30fd18E08",
        "scheme": "exact"
      },
      {
        "amount": "1000000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww"
        },
        "maxTimeoutSeconds": 300,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "5HK2dGaaquDWFnYWaWhMzMYtbcDsqeq5biJ2PMtX1tkN",
        "scheme": "exact"
      }
    ],
    "description": "x402 conformance verification for wallet developers. Pay $1.00 USDC on Base or Solana; receive an Ed25519-signed attestation that your client completed a real 402→auth→settle→deliver cycle on production infrastructure. Includes @maraventano/map decoder source (src/read.js) inline for URL parsing in future transactions. Use in CI pipelines, before SDK releases, or as agent-to-agent trust anchor.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {},
            "type": "http"
          },
          "output": {
            "example": {
              "content": "Signed Ed25519 attestation of end-to-end x402 conformance plus @maraventano/map decoder source inline",
              "delivered_at": "2026-07-18T17:00:00Z",
              "product": "certify_your_wallet",
              "title": "Certify Your Wallet + MerchantKey"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {},
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-09T21:59:44.806Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-09T21:59:44.7Z"
    },
    "resource": "https://underground.substratesymposium.com/api/merchant-key",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "x402 conformance verification for wallet developers. Pay $1.00 USDC on Base or Solana; receive an Ed25519-signed attestation that your client completed a real 402→auth→settle→deliver cycle on production infrastructure. Includes @maraventano/map decoder source (src/read.js) inline for URL parsing in future transactions. Use in CI pipelines, before SDK releases, or as agent-to-agent trust anchor."
}

What the leaf hashes

{"body":"022288dd6658821858397007e133cd7678c1c1fa7820217a0fe7caa219e181e3","id":123377,"kind":"listing","method":"baseline/1","observed_us":1793025623110495,"prev":null,"subject":"x402_bazaar:https://underground.substratesymposium.com/api/merchant-key","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. 0x85cf2339455373022f19d9455b3185ecae54a04ad8ce5404785560941fd1521b
2. 0x7a4f2375cd245d941920d3c0d1c1fb35ddfb81b448d35ae2b1e991ec5b0576d5
3. 0xc937178a4f8079335ac56a8e9f90472329d0d1603801191b91482b0488ac74e9
4. 0x81be87a13dac32e61e83c047d76f39016ed8c4744b24b6ed14c83fd798c78a7b
5. 0x379afbede755a252d6261d6baa3435dbcfcb952dd6902c5235fbd1458887de89
6. 0xf4472886a1c4e87445df0a0b844d5051a1ae148ff60c4f101849f2044b0d565b
7. 0x9b80099c64e2f9da3b818d5e4c586e3743c1549048fe64a573162427a7683b8b
8. 0x8c782e62289f919fbb06c62db7726f7c2e1dc53548d539c229afce243b89cdad
9. 0x95e90180070db9bfeda2c16ce968b841b7df81775ec93798bc8cedbe8a9c614d
10. 0x592ee83939c77b8a42b857cd7609a3112c13a109404399477008fab4fc58dc87
11. 0xd6d2fb435c815b0341c19086a636cc9a706a6129405e2030054a243942b686fe
12. 0x146f43471a3bde6d8a04e87b6afd3ee6860c6e38a009f86aee705ce722b67748
13. 0x91c2ae93ec20c7fed5088112fe3941ca622dfb3f8f1022c4844726c361244bd4
14. 0x0eff463856b0992d53ab7d8c0b97c71541413358bdd445710c1e4b6aeb4d8f78
15. 0x7eb603d37f0f22dae1ea013e391889906ffc0139ff26e25b044bee38eec8f9b2
16. 0x2b6e23e3624a1b66e1d2298cfbce99a93ce6b13d24a58112a71802d79c5f7a76
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae