Extrinsic 39257-2

{
  "heartbeat": {
    "blockNumber": 39256,
    "sessionIndex": 654,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x22925b866799f2a512d74cd2318a0598ed3d6bfdf045a867ea08c1a37a3fde0b2fc0c980a336fb13b30976634a335e671e398c2d72e8d9e2251b6f078c4ab881"
}