Extrinsic 18828-1

{
  "heartbeat": {
    "blockNumber": 18826,
    "sessionIndex": 313,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x5eef16a74906ad17d70077a074ff304055653e95da74d61ed8e31d64aca9fc1c11174c1f4c26355da9dc8ddc011ebea21a91744986bcca6bd0b4a7f914de1e82"
}