Extrinsic 6854-1

{
  "heartbeat": {
    "blockNumber": 6852,
    "sessionIndex": 114,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x52ffbf28ea8409b721904b601e232f24407939223373d97f693c47fa14c28c7dc98f37fd2d0989f58f21196d9b356c8362ab031654a40086a01d5c1bc13fe088"
}