Extrinsic 20537-1

{
  "heartbeat": {
    "blockNumber": 20535,
    "sessionIndex": 342,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xb67aa957069fe6c4800e6bdcd46e53207b77a5d5f6c64a7f65111cbe63e80338ff220cd8f9622a15b21f3eecf11a7a4d881babd296d944c7e5cbba42385dfc80"
}