Extrinsic 18584-1

{
  "heartbeat": {
    "blockNumber": 18583,
    "sessionIndex": 309,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x9eb502a8fbb34809812b79eb0780a9992a896fa10938253b3563c1cb0cb502670db6edb4373a0c2e24373c6dd31ebb8d7a4a8585bfac23508c472caee6a6d48d"
}