← The evidence ledger
Evidence row 2201523
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://network-calc.x402tookit.com/propagation-delay
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 0b1a15558bf9719fb4ea27749c8769f0f627ef30d47c27becacdc8d6559698d1
- Leaf
- 0xde4e29f7082141caccdb99b7bb7fda3fd44903488aa78213dbb1f186183dfb67
What was observed
{
"endpoints": [
[
"x402",
"https://network-calc.x402tookit.com/propagation-delay"
]
],
"name": "Network Calc",
"owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
"raw": {
"accepts": [
{
"amount": "20000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
"transactionVersions": [
0
]
},
"maxTimeoutSeconds": 300,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:137",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:42161",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
}
],
"description": "Propagation delay (one way and round trip) over fibre, copper or radio for a distance or two coordinates, plus serialization.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"lat1": 40.7128,
"lat2": 51.5074,
"lon1": -74.006,
"lon2": -0.1278,
"medium": "fiber",
"routeFactor": 1
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-11T14:45:32.093Z",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"distanceKm": 5570.2299,
"distanceSource": "great circle",
"linkMbps": null,
"medium": "fiber",
"microsecondsPerKm": 4.89672,
"notChecked": [
"real cable routes, which are longer than the great circle (submarine and terrestrial paths add 30% to 100% or more)",
"equipment, queueing, routing and processing delay, which usually exceed propagation delay on short paths",
"…3 more"
],
"oneWayMs": 27.275861,
"packetBytes": 1500,
"pathKm": 5570.2299,
"percentOfLightSpeed": 68.1199,
"reasons": [
"Speed in optical fibre (group index about 1.468): c / 1.468 = 204218.3 km/s, or 4.897 microseconds per km.",
"This is the physical lower bound: real round-trip times are higher because of detours, queueing and equipment."
],
"refractiveIndex": 1.468,
"roundTripMs": 54.551722,
"routeFactor": 1,
"serializationMs": null,
"source": "Propagation speed c / n with c = 299,792.458 km/s; great-circle distance on a 6371.0088 km sphere, computed locally",
"speedKmPerSecond": 204218.296,
"summary": "5570.2 km of fiber: 27.276 ms one way, 54.552 ms round trip at 204218 km/s (68.1% of c).",
"totalOneWayMs": 27.275861,
"vacuumOneWayMs": 18.580287,
"verdict": "COMPUTED"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"distanceKm": {
"description": "Cable or path length in km (use this, or the four coordinates)",
"type": "number"
},
"lat1": {
"description": "Start latitude (great-circle distance with lat2, lon1, lon2)",
"type": "number"
},
"lat2": {
"description": "End latitude",
"type": "number"
},
"linkMbps": {
"description": "Link speed in Mbps for serialization delay",
"type": "number"
},
"lon1": {
"description": "Start longitude",
"type": "number"
},
"lon2": {
"description": "End longitude",
"type": "number"
},
"medium": {
"description": "fiber (default), copper, vacuum or air",
"enum": [
"fiber",
"copper",
"vacuum",
"air"
],
"type": "string"
},
"packetBytes": {
"description": "Packet size in bytes for serialization delay (default 1500)",
"type": "number"
},
"routeFactor": {
"description": "Real cable length divided by great-circle distance, 1 to 3 (default 1; real routes are often 1.3 to 2)",
"type": "number"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"distanceKm": {
"type": [
"null",
"number"
]
},
"distanceSource": {
"type": [
"null",
"string"
]
},
"linkMbps": {},
"medium": {
"type": [
"null",
"string"
]
},
"microsecondsPerKm": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"oneWayMs": {
"type": [
"null",
"number"
]
},
"packetBytes": {
"type": [
"null",
"number"
]
},
"pathKm": {
"type": [
"null",
"number"
]
},
"percentOfLightSpeed": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"refractiveIndex": {
"type": [
"null",
"number"
]
},
"roundTripMs": {
"type": [
"null",
"number"
]
},
"routeFactor": {
"type": [
"null",
"number"
]
},
"serializationMs": {},
"source": {
"type": [
"null",
"string"
]
},
"speedKmPerSecond": {
"type": [
"null",
"number"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"totalOneWayMs": {
"type": [
"null",
"number"
]
},
"vacuumOneWayMs": {
"type": [
"null",
"number"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T23:40:44.973Z",
"quality": {
"l30DaysTotalCalls": 3,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T23:40:44.807Z"
},
"resource": "https://network-calc.x402tookit.com/propagation-delay",
"serviceName": "Network Calc",
"tags": [
"latency",
"propagation-delay",
"fiber",
"network"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Propagation delay (one way and round trip) over fibre, copper or radio for a distance or two coordinates, plus serialization."
}What the leaf hashes
{"body":"0b1a15558bf9719fb4ea27749c8769f0f627ef30d47c27becacdc8d6559698d1","id":2201523,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646805826671,"prev":null,"subject":"x402_bazaar:https://network-calc.x402tookit.com/propagation-delay","subject_kind":"source_record"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (444186 rows).
- 0xde4e28f42dbb426252c267183e4a0c145baa95aa5032b404560c109ed36f9828
- 0x8a33ef47978ac166d182a97490ffb8a22d07a5e095f815e72aab0180bd3e8d66
- 0xe90b447a8cb31f1cf24713e0ed18c33d787a4a62ac7cdde36e4abc4b5db763d3
- 0x2345aebf2fb44e036443cecfa048239fe71a8612a7212a82d296f457db6ec15b
- 0x50e7cc86da0685440a2c8ab3e98fd58be9850d4827f75fd9a08e0afe82e9efbf
- 0x56f40e2ac3ba659629bc6a397934962f912831b20a1574be75586641b8e711d5
- 0x9639794b5ca507f64b068d3799c83f1b0d63222ce39a185c8dcc5035e4c1d3e2
- 0x82999bc2bdeeaf03af81a784e6a39a72c75515f0b2ac744b3383299fdbcb683e
- 0x1df9e78edd14d759d114bff309b823a3cd9cbd8109ac22684be8c0cc0efb00ed
- 0xca9e3d9587d951c7ae441637009ef7e22abc8d8895ada4d4dcf891f7beaa2f3c
- 0x1d4f7107983a6cb8f818f859badeffbb9964454c836d1abb96f96320854655a0
- 0x933c861a9715acc355546ac1de965c0ed1155480f615b2e5e8679f2112c69496
- 0x1cd421f1e0b0be98fab8392181e25435047bd7c44fcbda07fa5cd27615d6b674
- 0x5dd75981e1af83dc5ec1e2b8a2959012484cc3ea2e0defded2187a5a93ba7236
- 0xa370e8e015a32408a8112e54e5f40a8a65e871bd52bbc6f25fbd1139f2ba5b11
- 0x7ddefa7d79e7640c3fed21ee4472689415182c41a0258ab04a81d60495f4c40a
- 0xdb8bd933619a267f9790faac9839143d202be46af284371cc369cdf683f897ba
- 0x98cbbf2c68ab4c0b4db782aeb88bea1f30b02178cf8b5d3d24a931d19492ea6d
- 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af