Extrinsic 4358-1

{
  "heartbeat": {
    "blockNumber": 4357,
    "sessionIndex": 72,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x0c8718942f1701b417879cec4d68eab8024282620d32781d606d22ef0b50d871416a13d51f45ca950b1c7532a32fb57d73ae2ace671ce918c6b7e78977002781"
}