Extrinsic 7573-1

{
  "heartbeat": {
    "blockNumber": 7572,
    "sessionIndex": 126,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x408e7ae1d1da31241804f26e924a069ab1ae4a6872c007cca594bc0fab71d629de096b36292e0bb3e273793eb3dee6669e0561f0275f06c1d4f663349e45ee8f"
}