Extrinsic 1606-1

{
  "heartbeat": {
    "blockNumber": 1605,
    "sessionIndex": 26,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x90abe5c98c619f88bff38a279b4d1011ce21a56f58844d5d1845d959f90a3537e9eeac08d0b951339a1e1dfd3ee383413addf63616a6e51b51408d9a61027086"
}