Extrinsic 6488-1

{
  "heartbeat": {
    "blockNumber": 6486,
    "sessionIndex": 108,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x84c337f77140688c8be6484349115ff73e2c76d8ca67ea10dbf8d63663ca67310266d988887e4b16965735daa33db84cee71ae401d141217d83aa97b31d4e284"
}