Extrinsic 19176-1

{
  "heartbeat": {
    "blockNumber": 19175,
    "sessionIndex": 319,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x7696ac8106f35a7a72b027182df69fc04580b1cc2f67d396e287ad774da94b4b39ec1786601ba389e27dcca3ca9b9264c6808f19d5f836ddfa07ae34ea463e86"
}