Extrinsic 39648-1

{
  "heartbeat": {
    "blockNumber": 39647,
    "sessionIndex": 660,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x886590e6f69665e27d9f80ff38e80733f2db548be556d526860723f2cda9bd40cfb209b0bfa30664199e9f1a060d425eaad7f81ab2ce7052bdd9754b3199be8c"
}