Extrinsic 27320-1

{
  "heartbeat": {
    "blockNumber": 27318,
    "sessionIndex": 455,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x96e69a616355c808786efdbb0600de96926137215e314333a7fd7e2c74f60f14122f854b477415823e8b342e46cce2fe78c93b998e7c1b819aefe7a74efd378c"
}