Extrinsic 20208-1

{
  "heartbeat": {
    "blockNumber": 20207,
    "sessionIndex": 336,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xa04f9923c159d98786778ff98a64766da03185e217f63a15297f0d24597fe647be8b9fbe401c1a3c41c7d75fccd662400398c90c997bc7767eee78f054c0958a"
}