Extrinsic 20389-1

{
  "heartbeat": {
    "blockNumber": 20387,
    "sessionIndex": 339,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x08bce79e709f4ec4c744bfaf46ada801155dd9c074cfe7ef13f70453dd34da7820dffc334f37f8535cc0432485532638af9a8ab3cad1278f0164b53f40d52287"
}