Extrinsic 38448-1

{
  "heartbeat": {
    "blockNumber": 38447,
    "sessionIndex": 640,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x4a05a69c9a14898d83a1b8a36ace376123b8330166aae67af5b2df2d7f226c61a0f8d691da4da2c32aa7affa7d981f3caccf8fb32c12b5d4fa1779b7070c9080"
}