Extrinsic 3464-1

{
  "heartbeat": {
    "blockNumber": 3463,
    "sessionIndex": 57,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x42062e4f8810637301bc7fa45645d8440a7a37a0893d11d1873c89f905abc4492bc14581d86128dcca74f649291d7ff2b5ef0c7dbd0cab04f5f8e36232ff7380"
}