Extrinsic 19899-1

{
  "heartbeat": {
    "blockNumber": 19898,
    "sessionIndex": 331,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xbe40484f761cf9a33724e5cb5bf16b38523fad399ca0fe6db9d8104858fd326708a3c1b85b0336525e2d9563d33f7964ba13f72fea671569d43924866a309b86"
}