Extrinsic 19541-1

{
  "heartbeat": {
    "blockNumber": 19540,
    "sessionIndex": 325,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xee6e6e3c9a38a7b19cfeada5db7dfe86d4bd6e8e6307c0e02e66580473752a6430fa11747153e0bb1491d88560e4bbfe3511df85cb9b29877c9471f64d89e584"
}