Extrinsic 16221-1

{
  "heartbeat": {
    "blockNumber": 16219,
    "sessionIndex": 270,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x9e9d0fe92f67839264a21e6b0cab8d9f156079f91937b8eb4ed3b24d5a5e7611944c4365a354220291726d403a55f777bfd55106836d940f878d0260daa06480"
}