Extrinsic 4006-1

{
  "heartbeat": {
    "blockNumber": 4005,
    "sessionIndex": 66,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xbe64fda2325884e21b4d44f90fc3ad104a7fdbedbb30141e748db55b8e675c1ad2ea8dcd2d1ddd2be6e8f9f7a6e6b4238d47d689404ba71d0638d3f7d3821180"
}