Extrinsic 3138-1

{
  "heartbeat": {
    "blockNumber": 3137,
    "sessionIndex": 52,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x38853ed95190942a460b83d85b1ca13a8ec1d6c53a50717e90783d49555afe36b4d88c1cfeb78cdc768ce25168f681ece27cdcf2ead96936bd4566d84ff4b284"
}