Extrinsic 55747-1

{
  "heartbeat": {
    "blockNumber": 55746,
    "sessionIndex": 929,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x4cdb43daaecc8a1a6ceab6134e930a94dd9e398e722e79e76c2ea6c3142a0120e0f8d7d02282366cbad757681ba4261e26081172ca139b4f471ee466edd6c680"
}