PranaNet
AQI 283
← bkc-01.prananet.eth
← #298#300 →

Reading #299

192Moderate

bkc-01.prananet.eth · cell te7u6n · 7/11/2026, 00:19:00 IST

PM2.5
87.6 µg/m³
PM10
87.6 µg/m³
Temperature
22.1 °C
Humidity
54.3 %

Arkiv entity

Open in Arkiv explorer ↗
Entity key
0x223a1b255194032df284535ee80e7582fb292ce746292e7765968df6ae9f5237
Written by (relayer wallet)
0x3a1f21f1c6f05efa35bb7178274b41c8873cca67
Expires
10/11/2026, 00:20:19 IST (3 days after the reading)
Queryable attributes
device = 0x4379c30ae56431f0485731f6e730ee0084e955c0ens = bkc-01.prananet.ethgeohash = te7u6nepoch = 1793990940nonce = 299pm25_x10 = 876pm10_x10 = 876simulated = false
Query that finds this record
from("prananet.reading").where(device = 0x4379c30ae56431f0485731f6e730ee0084e955c0 && nonce = 299).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
    2epochuint2563217939909400x000000000000000000000000000000000000000000000000000000006aee211c
    3pm25_x10uint256328760x000000000000000000000000000000000000000000000000000000000000036c
    4pm10_x10uint256328760x000000000000000000000000000000000000000000000000000000000000036c
    5temp_x10int256322210x00000000000000000000000000000000000000000000000000000000000000dd
    6hum_x10uint256325430x000000000000000000000000000000000000000000000000000000000000021f
    7nonceuint256322990x000000000000000000000000000000000000000000000000000000000000012b
    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 0xadc5e43055647a3e823c06164f89153ffcda06cfccc79ddffe08627b7b39dc97
    s 0x5f2c5ba963564fcebfcaf06ee47ce436c5522d5cc59176d2584885d4327d10a4
    v 27
    recovered …
  4. …
    Step 4

    Compare with the registered device key

    registered 0x4379c30ae56431f0485731f6e730ee0084e955c0
  5. ✓
    Step 5

    Nonce strictly increases

    Nonce 299 follows #298, 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": 1793990940,
  "pm25_x10": 876,
  "pm10_x10": 876,
  "temp_x10": 221,
  "hum_x10": 543,
  "nonce": 299,
  "signature": "0xadc5e43055647a3e823c06164f89153ffcda06cfccc79ddffe08627b7b39dc975f2c5ba963564fcebfcaf06ee47ce436c5522d5cc59176d2584885d4327d10a41b",
  "simulated": false
}