Extrinsic 1422-1

{
  "heartbeat": {
    "blockNumber": 1420,
    "sessionIndex": 23,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x2a6c087394e6252fe878521dda567ecdfcfd00743d2d8c9a935fdccf92e4b01f7fa2cd8b32a4b4d7d1f728949e0bf201c7ea436365c3b28aea2abf406ad66b8a"
}