Extrinsic 20781-1

{
  "heartbeat": {
    "blockNumber": 20780,
    "sessionIndex": 346,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xfed0b17f87403130bb99754cc0492173a632926e0c3d1c2fb092ca55edd97a07d84709561bd40c956598fc00f6f1afaa9b0ebbca81c89ebd9b940a6a6166af8e"
}