PranaNet
AQI 311
← bkc-01.prananet.eth
← #439#441 →

Reading #440

192Moderate

bkc-01.prananet.eth · cell te7u6n · 7/11/2026, 02:39:00 IST

PM2.5
87.6 µg/m³
PM10
87.6 µg/m³
Temperature
21.6 °C
Humidity
67.6 %

Arkiv entity

Open in Arkiv explorer ↗
Entity key
0xc37bf8860be0dc71abb027eed4f05388482cca558d256971f1a440668d0e1611
Written by (relayer wallet)
0x3a1f21f1c6f05efa35bb7178274b41c8873cca67
Expires
10/11/2026, 02:40:15 IST (3 days after the reading)
Queryable attributes
device = 0x4379c30ae56431f0485731f6e730ee0084e955c0ens = bkc-01.prananet.ethgeohash = te7u6nepoch = 1793999340nonce = 440pm25_x10 = 876pm10_x10 = 876simulated = false
Query that finds this record
from("prananet.reading").where(device = 0x4379c30ae56431f0485731f6e730ee0084e955c0 && nonce = 440).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
    1deviceaddress200x4379c30ae56431f0485731f6e730ee0084e955c00x4379c30ae56431f0485731f6e730ee0084e955c0
    2epochuint2563217939993400x000000000000000000000000000000000000000000000000000000006aee41ec
    3pm25_x10uint256328760x000000000000000000000000000000000000000000000000000000000000036c
    4pm10_x10uint256328760x000000000000000000000000000000000000000000000000000000000000036c
    5temp_x10int256322160x00000000000000000000000000000000000000000000000000000000000000d8
    6hum_x10uint256326760x00000000000000000000000000000000000000000000000000000000000002a4
    7nonceuint256324400x00000000000000000000000000000000000000000000000000000000000001b8
    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 0xafa07418e9a7f24f1d34050dc18b1e0353f485eb5f152ee59399e7514503ee59
    s 0x6395b6a43625c62104e805eaab20f0927f1c17344d904c43e0c7218646422e85
    v 27
    recovered …
  4. …
    Step 4

    Compare with the registered device key

    registered 0x4379c30ae56431f0485731f6e730ee0084e955c0
  5. ✓
    Step 5

    Nonce strictly increases

    Nonce 440 follows #439, 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": "0x4379c30ae56431f0485731f6e730ee0084e955c0",
  "ens": "bkc-01.prananet.eth",
  "geohash": "te7u6n",
  "epoch": 1793999340,
  "pm25_x10": 876,
  "pm10_x10": 876,
  "temp_x10": 216,
  "hum_x10": 676,
  "nonce": 440,
  "signature": "0xafa07418e9a7f24f1d34050dc18b1e0353f485eb5f152ee59399e7514503ee596395b6a43625c62104e805eaab20f0927f1c17344d904c43e0c7218646422e851b",
  "simulated": false
}