Extrinsic 20347-1

{
  "heartbeat": {
    "blockNumber": 20345,
    "sessionIndex": 339,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x9ccbb7c1b4435ff4c124c49d13a4d33304eb3832eb42bb4bcdac18ce512dc1192751d9d313a4bcd09a6bcd886a492310ff56dc44f9662710a6d59d7cd3f2478b"
}