Extrinsic 3250-1

{
  "heartbeat": {
    "blockNumber": 3249,
    "sessionIndex": 54,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x1c9a324c5788dc8f405302ff4336d666863e04503cfa0ca832296e590367886d1ca09f8bdefeb48b28ba1d0b43ec276e4e13aac96d71ad06f67fc96092c18e83"
}