Extrinsic 20247-1

{
  "heartbeat": {
    "blockNumber": 20246,
    "sessionIndex": 337,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x9e789eb4121674d36caa23478c125084e1435bb8e7918f8708e2d9e2f60470433228bf3d1e4b6ef0c4e34b40233e51a7c1c07bc6ea19946e629f948fdf04c28c"
}