Extrinsic 39875-1

{
  "heartbeat": {
    "blockNumber": 39873,
    "sessionIndex": 664,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xe0e94d97d044a072d0fbb9ec6610fdc541b870d3afc16b39d310e6a60eaf201ec918b90658f404b5ac273e6a22a30d036dafc6a2b4a3e56c65c13649fbccb984"
}