Extrinsic 2974-1

{
  "heartbeat": {
    "blockNumber": 2973,
    "sessionIndex": 49,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xa89eedf52f785f033c35edab27e4fce20c6b3e4f71ec8c2a4783e30e0e17b044728291c634d37e7d093dae3a2d070adb5fc30dbb3df586fdf1391659ecb6a084"
}