Extrinsic 28387-1

{
  "heartbeat": {
    "blockNumber": 28385,
    "sessionIndex": 473,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xe8fc1800c6999229f3a17e5b24cd665c513deff5682650b669277054c5e7f27b59859f213c376d5e354fb1d53b1b58f997e83f508e638d48d7cbf938475f8886"
}