Extrinsic 39709-1

{
  "heartbeat": {
    "blockNumber": 39707,
    "sessionIndex": 661,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xb0b558fa6053f6837d8ce48662ceab3b1832302493db7facb8044a83ae01ce47d9e0c96f53af249fc34a725d05453620317666e2a542435654fc7a34da6a0283"
}