Extrinsic 8717-1

{
  "heartbeat": {
    "blockNumber": 8716,
    "sessionIndex": 145,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x9056cfd020e169d9b22ad55374729ac5a0520d987a17a33346843b7bff7e972abe87ea52f6eddb06080c2a254be97d1303b6472abeac5f6e7504a570eb640883"
}