Extrinsic 18609-1

{
  "heartbeat": {
    "blockNumber": 18607,
    "sessionIndex": 310,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x68142cee21a7e8d6c91339c3fcced502f0784d8e84cc81f1e9fc6d3bb7934e4c4da27547e644b1b13cf050787aad87670f48b3e3e7c285c98dd8fbeb00466481"
}