← The evidence ledger
Evidence row 2201944
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://electronics-calc.x402tookit.com/led-resistor
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- bb799fed531e4c87407d7e7da7eb696058930d75599a6604b6c3ff2a3e9f53e8
- Leaf
- 0x3829ce3575c09c46805a3e4fb515ea7818fba53bf149468ffca5d88960a4e152
What was observed
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"owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
"raw": {
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{
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],
"description": "Series resistor for an LED from supply voltage, forward voltage and current, with nearest E12 and E24 values and real current.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"currentMa": 20,
"forwardV": 2,
"supplyV": 5
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-11T08:33:11.465Z",
"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.",
"e12": {
"above": 150,
"below": 150,
"closest": 150
},
"e24": {
"above": 150,
"below": 150,
"closest": 150
},
"exactPowerMw": 60,
"ledsInSeries": 1,
"notChecked": [
"the LED's absolute maximum current and the supply's tolerance",
"forward voltage varies by part and temperature (read the datasheet)",
"…2 more"
],
"reasons": [
"Round UP to the next standard value so the current stays at or below the target.",
"Use a resistor rated at least 2x its dissipation (a 1/4 W part is plenty for 60 mW)."
],
"recommended": {
"actualCurrentMa": 20,
"ohms": 150,
"resistorPowerMw": 60,
"series": "E24 next value up"
},
"resistanceOhm": 150,
"source": "computed locally",
"summary": "R = 150 ohm for 20 mA (3 V across the resistor); use 150 ohm (next standard E24 value up) for 20 mA, dissipating 60 mW.",
"verdict": "COMPUTED",
"voltageAcrossResistorV": 3
},
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},
"forwardV": {
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},
"supplyV": {
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}
},
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"e12": {
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"e24": {
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"lastUpdated": "2026-11-01T22:51:39.025Z",
"quality": {
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"lastCalledAt": "2026-11-01T22:51:38.74Z"
},
"resource": "https://electronics-calc.x402tookit.com/led-resistor",
"serviceName": "Electronics Calculators",
"tags": [
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"led",
"resistor",
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],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Series resistor for an LED from supply voltage, forward voltage and current, with nearest E12 and E24 values and real current."
}What the leaf hashes
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Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (444186 rows).
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- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af