Extrinsic 19426-1

{
  "heartbeat": {
    "blockNumber": 19424,
    "sessionIndex": 323,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x8afb767f226eb1dc7dc65450892b6bc7cc602de994cbab82731ac3560b205a5593b935fbd5c1e66e7b09cae2978681e8b50596ad97d679e8d5605f5fa5f60e84"
}