Extrinsic 4657-1

{
  "heartbeat": {
    "blockNumber": 4655,
    "sessionIndex": 77,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x2043b0ae4a2054b7eaac870ee677bced8d48f8ff75972dfd68ddee34f41d6a36ab80abc7acfe2535e4ee0ee28abae833056e8bf4adb6fd4c3d9e391d04ee7088"
}