Extrinsic 18878-1

{
  "heartbeat": {
    "blockNumber": 18876,
    "sessionIndex": 314,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x029278e08ba0eec1424d95110f89f75abfc95f3e359fba35d2201d5bc3ff704d8a00e7aa64c46434ff349153706e0cc457b889f851081c5bf7f6e55b939bfb8b"
}