Extrinsic 18435-1

{
  "heartbeat": {
    "blockNumber": 18434,
    "sessionIndex": 307,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x0ecf47b3ad45a472aa33abed6969427ef6c96a4e7aac25b1853608f5e5cff4070b444c2db3e772e69faab61916100abd665cc9b090531af30a3d2f22eb523084"
}