Extrinsic 19820-1

{
  "heartbeat": {
    "blockNumber": 19818,
    "sessionIndex": 330,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x58bb1b90ed67d80d2d9f66a78b04b2654fd518dc599d761ebb7cafd868eaaa22b744662d38738ba46acb0d6874541fb939f59c819c4b96a40b8699378db3f28c"
}