Extrinsic 3457-1

{
  "heartbeat": {
    "blockNumber": 3456,
    "sessionIndex": 57,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xe294b05d685ae2d9ee8fccc14597c3fac3991259bcb2d11c6fd5c9ad6406513580599df552ebf4036a8796b2a10d1a66700a2285f389621f051015db0bc62f89"
}