← The evidence ledger
Evidence row 2201521
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://network-calc.x402tookit.com/tcp-throughput
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 9b469029a95493ec115a7ec44ee0ac15e8b0f8e5671228b0c013da52544ae3ea
- Leaf
- 0x363657217f7dbeccc2817b6f08efaef02a1038e0207a0a9dd6ee30648a87f4fb
What was observed
{
"endpoints": [
[
"x402",
"https://network-calc.x402tookit.com/tcp-throughput"
]
],
"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": "TCP bandwidth-delay product, window size and scale factor needed, throughput limits from window and from packet loss (Mathis).",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"bandwidthMbps": 1000,
"lossPercent": 1,
"mssBytes": 1460,
"rttMs": 50,
"windowBytes": 65535
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-11T14:45:32.620Z",
"bandwidthMbps": 1000,
"bdpBytes": 6250000,
"bdpKiB": 6103.5156,
"bdpMiB": 5.960464,
"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.",
"expectedMbps": 2.861004,
"limitedBy": "loss",
"linkUtilizationPercent": 1.0486,
"mathisLimitMbps": 2.861004,
"mathisLossPercent": 1,
"mssBytes": 1460,
"notChecked": [
"congestion-control algorithm: the Mathis figure is an upper bound for Reno-style TCP; CUBIC and BBR reach different rates",
"slow start and short flows",
"…3 more"
],
"reasons": [
"Window-limited: window / RTT = 65535 bytes x 8 / 50 ms = 10.4856 Mbps.",
"Bandwidth-delay product = 1000 Mbps x 50 ms = 6250000 bytes in flight to keep the link full; that needs window scaling with shift 7 (x128).",
"…1 more"
],
"rttMs": 50,
"segmentsInFlight": 4280.82,
"source": "Bandwidth-delay product, RFC 7323 window scaling (max shift 14) and Mathis et al. 1997 (throughput <= (MSS/RTT) x sqrt(3/2) / sqrt(p)), computed locally",
"summary": "Expected throughput about 2.861004 Mbps, limited by loss; BDP 5.96 MiB.",
"verdict": "LOSS_LIMITED",
"windowBytes": 65535,
"windowLimitedMBps": 1.3107,
"windowLimitedMbps": 10.4856,
"windowScaleMultiplier": 128,
"windowScaleShift": 7,
"windowToFillLink": 6250000
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"bandwidthMbps": {
"description": "Link bandwidth in Mbps (to size the window)",
"type": "number"
},
"lossPercent": {
"description": "Packet loss in percent (for the Mathis limit)",
"type": "number"
},
"mssBytes": {
"description": "Maximum segment size in bytes (default 1460)",
"type": "number"
},
"rttMs": {
"description": "Round-trip time in milliseconds",
"type": "number"
},
"windowBytes": {
"description": "Receive window in bytes (default 65535 without scaling)",
"type": "number"
}
},
"required": [
"rttMs"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"bandwidthMbps": {
"type": [
"null",
"number"
]
},
"bdpBytes": {
"type": [
"null",
"number"
]
},
"bdpKiB": {
"type": [
"null",
"number"
]
},
"bdpMiB": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"expectedMbps": {
"type": [
"null",
"number"
]
},
"limitedBy": {
"type": [
"null",
"string"
]
},
"linkUtilizationPercent": {
"type": [
"null",
"number"
]
},
"mathisLimitMbps": {
"type": [
"null",
"number"
]
},
"mathisLossPercent": {
"type": [
"null",
"number"
]
},
"mssBytes": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"rttMs": {
"type": [
"null",
"number"
]
},
"segmentsInFlight": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"windowBytes": {
"type": [
"null",
"number"
]
},
"windowLimitedMBps": {
"type": [
"null",
"number"
]
},
"windowLimitedMbps": {
"type": [
"null",
"number"
]
},
"windowScaleMultiplier": {
"type": [
"null",
"number"
]
},
"windowScaleShift": {
"type": [
"null",
"number"
]
},
"windowToFillLink": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T23:40:50.109Z",
"quality": {
"l30DaysTotalCalls": 3,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T23:40:49.925Z"
},
"resource": "https://network-calc.x402tookit.com/tcp-throughput",
"serviceName": "Network Calc",
"tags": [
"tcp",
"bdp",
"window-size",
"throughput"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "TCP bandwidth-delay product, window size and scale factor needed, throughput limits from window and from packet loss (Mathis)."
}What the leaf hashes
{"body":"9b469029a95493ec115a7ec44ee0ac15e8b0f8e5671228b0c013da52544ae3ea","id":2201521,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646805815920,"prev":null,"subject":"x402_bazaar:https://network-calc.x402tookit.com/tcp-throughput","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).
- 0x363619157e7fd8cb1f1af95ffbf3eb72a99bca29b68a79cd3fb81180688903ff
- 0xe7e6c282a6a2f58553fc277277e197ec15246baa269a65dc40827126370fd369
- 0x8b9f3c2a44ade876c231bcb4c047f14224e9394b58b57ee798e22abfb69341ed
- 0x1766315ca17821c85c99eae7c1ee43a65b82efc250e60b28dcf2383444b2b43a
- 0x2c1b0d21a6d98d4ed0376cd6f998000f66b4425c4fec37dff37d6aa24d60840a
- 0xef72d33bf590294d26705910ee405d629be81fc64228f1d5ce320ffcd7d1c8cb
- 0xe4f4284693470731494e29a79ef9c3f18cd9bf467c78ced1d3f1a647a619db0e
- 0xbd0ebc032f8ac7b2411cc8ab60e432cc62600cf0252e02f09673774cb9d3fa44
- 0xec119f46cd1e0251d0d4bb1405ee9a3c4f13dc059a67fdfd1a0adb8c4006521c
- 0xcdb209c2e76ab1a8722dd4298ab0e03f40b1398ae10b05ff87c1215fb3aeed27
- 0xbbc3ba117939999fb474e22af0bc8e761d629e3ce88e75d37ff20c53fabc3b2e
- 0xf2afd692f9ecc84d8043fb7e2199fc37af44471368455fe6d2ad7651f20ae534
- 0xa0e5887b42201f4bffeb4ff69bd41372cabcdfc84eaf669d71bc4550864cf581
- 0xeda95b8bf6c7d0b27dc5b32d6a6006255f41e0f6bbe80842a49daa792f4de811
- 0x464ce6fe060d0a6c4e810b71501e55084086148f7daf393caa14462b1a777022
- 0xd42916b5c6441e9c8d91ff91715af1489cb83dee26d47e7da107caa4d2a68b65
- 0xa20b9be86af7d690e040c9060a373b2fc5498edf3432f43c26f74fa2febc1e9a
- 0x050f2978b537f7afb21ee1551577cdf146d1c56f4df12d24315ae5e69366b0a4
- 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af