Extrinsic 16574-1

{
  "heartbeat": {
    "blockNumber": 16572,
    "sessionIndex": 276,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x440f325f76dd79eecbe9cc8865949bdf00a4841e99437c1ab63bef97f3eb6d6c6e04cfad0efc2a5cd6ad21af715cde040761e90afc5ab4bb015e3b218897d98f"
}