Prove it yourself. Every four hours.

import { verifyMessage, getBytes } from "ethers";

const j = await (await
  fetch("https://kerne.fi/api/por/signed")
).json();

const recovered = verifyMessage(
  getBytes(j.attestation_hash),
  j.signature,
);
console.assert(
  recovered.toLowerCase()
    === j.signer.toLowerCase(),
);

import requests
from eth_account import Account
from eth_account.messages import encode_defunct

j = requests.get(
  "https://kerne.fi/api/por/signed"
).json()

msg = encode_defunct(hexstr=j["attestation_hash"])
recovered = Account.recover_message(
  msg, signature=j["signature"],
)
assert recovered.lower() == j["signer"].lower()

curl -s https://kerne.fi/api/por/signed > por.json

HASH=$(jq -r .attestation_hash por.json)
SIG=$(jq -r .signature  por.json)
SIGNER=$(jq -r .signer  por.json)

cast wallet verify-message \
  --address $SIGNER $HASH $SIG