Extrinsic 26503-1

{
  "heartbeat": {
    "blockNumber": 26502,
    "sessionIndex": 441,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xe66e135535a8a87891b4ff8c258734224385e6a1d8a955f73d4da50a6b6291030e68150fc97bf6063c0830baeffe6a24fe7866f2ec11788596052c3b48692784"
}