Extrinsic 19888-1

{
  "heartbeat": {
    "blockNumber": 19886,
    "sessionIndex": 331,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xa6b1ea57998e5307f1eee46e4d36789b44aff6cd17a5cb9e7fa88ce68ba6a3546002ae19c6f059c12dad10f1d8f0cd48f2082de3eb47900089071737a3fcf688"
}