Extrinsic 19268-1

{
  "heartbeat": {
    "blockNumber": 19266,
    "sessionIndex": 321,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xb2915fe0a1660427a9779a95ddad1983c854effe647ebd675f2fdaacab34fe3c8289df439ce147a49b45686560906c710757b814d9f7acfb260f869711779187"
}