PranaNet
AQI 292
← bkc-sim-04.sim.prananet.eth
← #520#522 →

Reading #521

210Poor

bkc-sim-04.sim.prananet.eth · cell te7u3y · 7/11/2026, 03:22:00 IST · simulated device

PM2.5
92.9 µg/m³
PM10
164.6 µg/m³
Temperature
29.4 °C
Humidity
66.8 %

Arkiv entity

Open in Arkiv explorer ↗
Entity key
0x1bab018779e04623ad8e0492943649e6bc5197c5163f7e5c3d461fef28aa360b
Written by (relayer wallet)
0x3a1f21f1c6f05efa35bb7178274b41c8873cca67
Expires
10/11/2026, 03:24:00 IST (3 days after the reading)
Queryable attributes
device = 0x35025af20ff45df8ac04d45f8b91ff1baa61e5a5ens = bkc-sim-04.sim.prananet.ethgeohash = te7u3yepoch = 1794001920nonce = 521pm25_x10 = 929pm10_x10 = 1646simulated = true
Query that finds this record
from("prananet.reading").where(device = 0x35025af20ff45df8ac04d45f8b91ff1baa61e5a5 && nonce = 521).ownedBy(0x3a1f21f1c6f05efa35bb7178274b41c8873cca67)

Check it yourself

Your browser just repeated the check the Readings contract does on-chain. The relayer only pays gas: changing any value would break the signature.

  1. ✓
    Step 1

    Rebuild the 264-byte message

    #FieldTypeBytesValuePacked hex
    1deviceaddress200x35025af20ff45df8ac04d45f8b91ff1baa61e5a50x35025af20ff45df8ac04d45f8b91ff1baa61e5a5
    2epochuint2563217940019200x000000000000000000000000000000000000000000000000000000006aee4c00
    3pm25_x10uint256329290x00000000000000000000000000000000000000000000000000000000000003a1
    4pm10_x10uint2563216460x000000000000000000000000000000000000000000000000000000000000066e
    5temp_x10int256322940x0000000000000000000000000000000000000000000000000000000000000126
    6hum_x10uint256326680x000000000000000000000000000000000000000000000000000000000000029c
    7nonceuint256325210x0000000000000000000000000000000000000000000000000000000000000209
    8chainIduint25632111551110x0000000000000000000000000000000000000000000000000000000000aa36a7
    9readingsContractaddress200x9192Fc053e1493EB2B7355192aa3F8e57AAE01d80x9192fc053e1493eb2b7355192aa3f8e57aae01d8

    abi.encodePacked, no padding between fields. chainId and contract stop replay on other chains. Total: 264 bytes.

  2. …
    Step 2

    Hash it with keccak256

    …
  3. …
    Step 3

    Recover the signer from the EIP-191 signature

    r 0x
    s 0x
    v NaN
    recovered …
  4. …
    Step 4

    Compare with the registered device key

    registered 0x35025af20ff45df8ac04d45f8b91ff1baa61e5a5
  5. ✓
    Step 5

    Nonce strictly increases

    Nonce 521 follows #520, so this reading can't be replayed.
  6. ✓
    Step 6

    Cross-checked against neighbours

    Not flagged. The value agrees with neighbouring devices within the verifier's threshold.

Raw reading JSON
{
  "device": "0x35025af20ff45df8ac04d45f8b91ff1baa61e5a5",
  "ens": "bkc-sim-04.sim.prananet.eth",
  "geohash": "te7u3y",
  "epoch": 1794001920,
  "pm25_x10": 929,
  "pm10_x10": 1646,
  "temp_x10": 294,
  "hum_x10": 668,
  "nonce": 521,
  "signature": "0x",
  "simulated": true
}