Extrinsic 20324-1

{
  "heartbeat": {
    "blockNumber": 20323,
    "sessionIndex": 338,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xb0f7d66d0ce018721b117d35d08a2a54b94045fb22b87e38e5d44551f32b146004c96cb650bf26d5befbe85a18c4c97824d2ede39c79fb2fe43163978cb81383"
}