Extrinsic 1606-1

{
  "heartbeat": {
    "blockNumber": 1604,
    "sessionIndex": 26,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x4ac67a98cb602c1b0423c2bf4a1b0fecb339cb56abb2917cfe2fb6d26905a0670aca4677e3c292fb75f4f84fe4ed4fcb51e6d2d43f571310454c439a91a8e08c"
}