Extrinsic 19549-1

{
  "heartbeat": {
    "blockNumber": 19547,
    "sessionIndex": 325,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x7247f65e929e1f3be3a5fead45d25b66cbbb8baf3c44d5d102b3629cf720f37892aa8b05e4415dc344274b8b970f01f00f5200ac1e96e73b0b8abb1eb7699383"
}