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Evidence row 120339

Observed , by baseline/1.

Kind
listing
About
source_record x402_bazaar:https://saylorinnovations.com/api/kb/typescript-narrowing-unknown-never-discriminated-unions-errors
Recorded
Previous row
None: the first of its kind about this subject
Body SHA-256
54ecb21032d616c822aee59376e770886372736afe60cd07b205df6c1bea0ced
Leaf
0x14a8ba320b2406fc3f8e3f1d4dd1fdac76597b0cd7847547a04d593bb04e0cbb

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://saylorinnovations.com/api/kb/typescript-narrowing-unknown-never-discriminated-unions-errors"
    ]
  ],
  "name": "Saylor Innovations Guide Library",
  "owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:typescript-narrowing-unkn",
          "name": "USD Coin",
          "note": "Base settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:8453",
        "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:typescript-narrowing-unkn",
          "name": "USD Coin",
          "note": "Polygon settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:137",
        "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:typescript-narrowing-unkn",
          "name": "USD Coin",
          "note": "Arbitrum settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:42161",
        "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb",
          "memo": "saylor:typescript-narrowing-unkn",
          "reference": "CZvN2RDStZETv4zrc5otrJ2cpBp6DCQhjtbmCc4H4FXV",
          "session": "eyJhcnRpY2xlSWQiOiJ0eXBlc2NyaXB0LW5hcnJvd2luZy11bmtub3duLW5ldmVyLWRpc2NyaW1pbmF0ZWQtdW5pb25zLWVycm9ycyIsInJlZmVyZW5jZSI6IkNadk4yUkRTdFpFVHY0enJjNW90ckoyY3BCcDZEQ1FoanRibUNjNEg0RlhWIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRVBqRldkZDVBdWZxU1NxZU0ycU4xeHp5YmFwQzhHNHdFR0drWnd5VER0MXYiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI5Njg5MzU2MTd9.1TwDz-4o1KwkOfnuIEg7sGcuErL5SKaVMGprbUzIggk"
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
        "extra": {
          "feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb",
          "memo": "saylor:typescript-narrowing-unkn",
          "reference": "7DYTSqrYJMGqJwohHrYGKGAxu4iwtF3HmQ5YKUib7svt",
          "session": "eyJhcnRpY2xlSWQiOiJ0eXBlc2NyaXB0LW5hcnJvd2luZy11bmtub3duLW5ldmVyLWRpc2NyaW1pbmF0ZWQtdW5pb25zLWVycm9ycyIsInJlZmVyZW5jZSI6IjdEWVRTcXJZSk1HcUp3b2hIcllHS0dBeHU0aXd0RjNIbVE1WUtVaWI3c3Z0IiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRXM5dk1GcnphQ0VSbUpmckY0SDJGWUQ0S0NvTmtZMTFNY0NlOEJlbndOWUIiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI5Njg5MzU2MTd9.wHyv6BI36RuLXJmUTERgA8PmblM97JfCtoBsYAtrLs4"
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      },
      {
        "amount": "95518",
        "asset": "So11111111111111111111111111111111111111112",
        "extra": {
          "memo": "saylor:typescript-narrowing-unkn",
          "native": true,
          "note": "Native SOL: send lamports with a system transfer, not an SPL transfer. Price is quoted live and this quote expires in 120s.",
          "quotedLamports": "98473",
          "reference": "9FH7d8Gur5KxEKEQGLEjUE9UeaCcyzEcbTYm79LsMzqM",
          "session": "eyJhcnRpY2xlSWQiOiJ0eXBlc2NyaXB0LW5hcnJvd2luZy11bmtub3duLW5ldmVyLWRpc2NyaW1pbmF0ZWQtdW5pb25zLWVycm9ycyIsInJlZmVyZW5jZSI6IjlGSDdkOEd1cjVLeEVLRVFHTEVqVUU5VWVhQ2N5ekVjYlRZbTc5THNNenFNIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjpudWxsLCJtaW5BbW91bnQiOjk1NTE4LCJleHAiOjE3OTI5Njg5MzU2MTd9.PTfaiq6hkYbSv-IHyxbhQfjHlKJ7LvDp5bLvZeB5SC8",
          "solUsdPrice": 101.55
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      }
    ],
    "description": "Fix strict TypeScript errors - TS18046 unknown, TS2339 unions, TS2540 as const, TS2353 excess props, TS18048 index access, never exhaustiveness",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "type": "http"
          },
          "output": {
            "example": {
              "body": "Compiled with TypeScript in strict mode and noUncheckedIndexedAccess: real error codes and messages for each pattern, plus the corrected code using discriminated unions, typeof guards, optional chaining and a never exhaustiveness helper.",
              "c": "Self-Hosting & Infra",
              "id": "typescript-narrowing-unknown-never-discriminated-unions-errors",
              "t": "TypeScript Narrowing Errors: unknown, Unions, Readonly, Excess Properties, Index Access and never Exhaustiveness"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "body": {
                      "description": "Main body text",
                      "type": "string"
                    },
                    "c": {
                      "description": "Category of the guide",
                      "type": "string"
                    },
                    "id": {
                      "description": "Identifier of the record",
                      "type": "string"
                    },
                    "license": {
                      "description": "License identifier",
                      "type": "string"
                    },
                    "price": {
                      "description": "Price",
                      "type": [
                        "number",
                        "null"
                      ]
                    },
                    "t": {
                      "description": "Title of the guide",
                      "type": "string"
                    }
                  },
                  "required": [
                    "id",
                    "t",
                    "c",
                    "body"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "json",
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1791811517/bazaar-icons/bc5e2b3d111ebbef.jpg",
    "lastUpdated": "2026-10-25T22:53:35.663Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-25T22:53:35.333Z"
    },
    "resource": "https://saylorinnovations.com/api/kb/typescript-narrowing-unknown-never-discriminated-unions-errors",
    "serviceName": "Saylor Innovations Guide Library",
    "tags": [
      "typescript",
      "types",
      "narrowing",
      "strict",
      "errors"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Fix strict TypeScript errors - TS18046 unknown, TS2339 unions, TS2540 as const, TS2353 excess props, TS18048 index access, never exhaustiveness"
}

What the leaf hashes

{"body":"54ecb21032d616c822aee59376e770886372736afe60cd07b205df6c1bea0ced","id":120339,"kind":"listing","method":"baseline/1","observed_us":1793025617687693,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/kb/typescript-narrowing-unknown-never-discriminated-unions-errors","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (296695 rows).

  1. 0x14a8ab5aac8df61898cebef20ad7fb8ff036ec41da0db2047e57104767391394
  2. 0xd63b620022eee9779679773bc3cedcdc4fa441481ebe023241bf0ad6b628ee3a
  3. 0x7c405fe4705562958262d3c996c268ae7bf35edfec79c9b88f53c33af492099e
  4. 0xa8953b9a56fcfbff0f35c5972ff40dd339db20e89e617927406369e45dbe9d28
  5. 0x7e65f7f3b4c20d5061b1ba95645cd3410185bf917b31d106d56120757bce1728
  6. 0x8aa3971a69a37b9d7b86e8e22ed2cf493763abb5500d6c2569881e8c3d4268ad
  7. 0x78b86ebb4b045ddffa1ba39366de3ef3504c23e9e934286d18055a0bfa4c05fc
  8. 0x48f40a310695d4651e0cd5effc1d19c591287d15c1b4f1852288e5bbe269f8d7
  9. 0xa1c97fce099b76ae5c7423a9989001840737260494a60f3b3091dbe3a1371215
  10. 0x008cbf3247d4503d443f28c4c20ecbbf230ffd5cf8ab0fd65a43b17b5b4825ba
  11. 0xb5d5212c69fb335bad2409aa4a0da0469cc6cc62939ca82d5235005f3b154a2b
  12. 0x2412cb8bc4d10d94e1eb907d5058dd12133e55416609e1b314e811af76620542
  13. 0xff1c28bdf595a3d1333e9915edc68e9c5fded7bd5923fa85870979af34cbc3b3
  14. 0xb49e8c2564256e5322e375cb619d9ac70fd17c1d1eba9c991bba4cb6428f45cc
  15. 0x60582ab4b41e72eb70eb0bce07fbf0fb4d2b62a8bad5be50f5d16d511adc746c
  16. 0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e
  17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
  18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
  19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
Day root
0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
Chained
0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
Published
On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae

How to check it · This row as JSON