Extrinsic 3699-1

{
  "heartbeat": {
    "blockNumber": 3697,
    "sessionIndex": 61,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x0c20463d30064b5b9236ac69d397dced26502fcfc991d5903e2945103a58d701c565ca511c2339d55c3c15d585173fd6eda35a81de512c8863fb1d06f5062a88"
}