Extrinsic 6643-2

{
  "heartbeat": {
    "blockNumber": 6641,
    "sessionIndex": 110,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x22113a2ca19c3538f148a943bf0a35bde005bc1781ce7317955373171187cf4a72beafee867768a8f68bc049c5eeb7b14dab94f3b4aac494e0dfba2d5bed0888"
}