Extrinsic 4470-1

{
  "heartbeat": {
    "blockNumber": 4468,
    "sessionIndex": 74,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x5c15fa808a0e659ea755d954c696ece1de00582320d7401ad587cabf3aa8dd63f4a5d8bcc8ae465fd206395322cf7fe8b73d9b10c14d3d83839af6acb2777984"
}