Extrinsic 3576-1

{
  "heartbeat": {
    "blockNumber": 3575,
    "sessionIndex": 59,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x88f4ca21d0a62c06603ae371bac3afd46758eac5632c433c6398d658c5ef654108b8f0aa5ddd2f4321a4355998f5a6deee37bdf4cdc65faaed432bf08d712e85"
}