Extrinsic 18099-1

{
  "heartbeat": {
    "blockNumber": 18097,
    "sessionIndex": 301,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x62a43eac55b14431f3c41c983dd5e28ee3d5b3eb180f08599a30e741a96e365843e1d58d137da3f247aa18500c2222d00d5a3b605a08dff7c8c13cf69c877d86"
}