Extrinsic 3391-1

{
  "heartbeat": {
    "blockNumber": 3390,
    "sessionIndex": 56,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x1c584497a8d5a6cbb41efaf8511a1e8140cde0913d1f6ee0ff8567b60a377e1a576ca600e77ef5d303dd0708dbc0c527e1d0cb3d45f2b7062f82b7985f2fbd8d"
}