Extrinsic 408-1

{
  "heartbeat": {
    "blockNumber": 407,
    "sessionIndex": 6,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xc2c1b372abca4ecdfae7060c45bf8d0bec12dde057c30976312dfe0c1e9c5a2d91dcecf7120bb94673fd14961fa4c7719d053fdd4302053f7725a506d282328c"
}