Extrinsic 7789-1

{
  "heartbeat": {
    "blockNumber": 7787,
    "sessionIndex": 129,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x2269644990fd060dca3c85c1aa392562e4002d312bc9c6e839a8d3099d0211624d83ce2fe9bf8dfa066d8699d2534e28d11fa6b735f3c0dcf7600c9409cbd382"
}