Extrinsic 39647-2

{
  "heartbeat": {
    "blockNumber": 39646,
    "sessionIndex": 660,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x9c656a21ebf9cb4d8348905e9f4eeb836fbef1c3f26ef25bb77b29b12ad4a7359abb624b91897913162f0cf067fb8bae8a42f4d96f1bc7a82f17b8cf82383089"
}