Extrinsic 18528-1

{
  "heartbeat": {
    "blockNumber": 18527,
    "sessionIndex": 308,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x66092ca13898963dc2cd1bbaedd404a229f662a80d04f000c291ccac619fb272334d84875b2b5ab6070e63db17bee89cdd3b25c175be87835a2c68b5bc0c618f"
}