Evidence row 123509

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://underground.substratesymposium.com/buy/proving_ground_experience"
    ]
  ],
  "name": "underground.substratesymposium.com/buy/proving_ground_experience",
  "owner_address": "0xa3babb36564b0383a82c617050306ee30fd18e08",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xA3bAbB36564b0383a82c617050306EE30fd18E08",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww"
        },
        "maxTimeoutSeconds": 300,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "5HK2dGaaquDWFnYWaWhMzMYtbcDsqeq5biJ2PMtX1tkN",
        "scheme": "exact"
      }
    ],
    "description": "The Proving Ground Experience — Testing environment for validation, stress-testing, and capability demonstration.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {},
            "type": "http"
          },
          "output": {
            "example": {
              "content": "Testing environment for validation, stress-testing, and capability demonstration.",
              "delivered_at": "2026-04-24T10:00:00Z",
              "product": "proving_ground_experience",
              "title": "The Proving Ground Experience"
            },
            "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": "2026-10-10T22:51:27.397Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-10T22:51:27.253Z"
    },
    "resource": "https://underground.substratesymposium.com/buy/proving_ground_experience",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "The Proving Ground Experience — Testing environment for validation, stress-testing, and capability demonstration."
}

What the leaf hashes

{"body":"cae3ca5255f9941dcf32020995cf216fda3b598e9a5f0ce533d2894881ff2968","id":123509,"kind":"listing","method":"baseline/1","observed_us":1793025623263774,"prev":null,"subject":"x402_bazaar:https://underground.substratesymposium.com/buy/proving_ground_experience","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. 0x2bad4bf07ebaeb76d5428450fecae615ed3a35fcb83bdd4cb2910844908a1030
2. 0x093e587e1e9e52c9df4a995da65a85f5c71c202d19fa4a6e6f716c1b5b126dc2
3. 0x969a3a2a257db2ab7cb530a4e44ecbf2c34edf64f7d7121fed68f02eeaee7151
4. 0x2a6264124c8394d86144740a86ac0f73eea9379700e1e631cba2b7af7bd0e31a
5. 0x3ac22e8a9bbccb38a71a8ee3eb0b06c38b44f7006718f1bf4e798f7fedd18e12
6. 0xe5f86230a00f8f8d4034faac73d14dfe28b402431c413f7733db2060ec5d0f15
7. 0xf36dfc419597aeb6e1bdc4e4ca2991e2c9ccbc63c5ec2103de710dbfe7e7a013
8. 0x2a2a2f10e1e0d712fd6848b94168f22112f29a18d50d4e53e5b1461a7f4d774b
9. 0x4b56b343294e474466fb86e0e07b807748a7fd58f1bcc4c4d158844fcd53480b
10. 0x1849abdab9b306191ae2d658697793afbb80090da1dc820f6ee0aacd338f8578
11. 0x9c1d7a3e2abd583b1dff8bd25a4baee5982930fe95a180a1a8b26c3f7e8c93f2
12. 0xe8bf822fd6c66b233e3e13e08596e8fb41c1ed9b85be0e4d50cfc9b740c0e206
13. 0xb87e8b32cda179c9e632e227bbd8a6d1f6f61d9d81bb92dbd4dd835d2b3b5caa
14. 0x683955a5b2250ad50568d022a6580d8739b6aff1356779d72a773b088e7c289c
15. 0x610738e0c43687aded83c613c73de8b5226c73c375858a167436461c522ea213
16. 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae