Extrinsic 8299-1

{
  "heartbeat": {
    "blockNumber": 8298,
    "sessionIndex": 138,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x60af543eaf98026a805ef8e9bad8e4af930b26420e7c03bec126922718844e7425cbf2f1181dd1ad75beec671b032086bdbb10df021d16830f6bb81383c3ee85"
}