Extrinsic 19701-1

{
  "heartbeat": {
    "blockNumber": 19700,
    "sessionIndex": 328,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x18d4912948a099252c59ae6c3f3a73aec5ef4d35ae8a5fdd9d25a3227631fe1d66128ab24653f77111e1663af6ecc0233abd03e711ab6f0cf70134dbe76bc786"
}