Extrinsic 16717-1

{
  "heartbeat": {
    "blockNumber": 16715,
    "sessionIndex": 278,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x34a8a9a43a60360c92239ff711fc63e9ee6c411876c6718320c55600abcbcb52ee104e07ec42b1ade5651bff0ef31b1d5805d0e5f35b99613e52e46ba7576b81"
}