Extrinsic 39375-1

{
  "heartbeat": {
    "blockNumber": 39373,
    "sessionIndex": 656,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xa693467a4835498c9f0f9832132d68f6e231c43ba98bb8ab0b5d24eff7a336104de8d81e8151286d532817b7a791ba01f0ed0456574154a0e2b187c0d07eeb8e"
}