Extrinsic 7474-1

{
  "heartbeat": {
    "blockNumber": 7473,
    "sessionIndex": 124,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x7e222b3b28d08cc126756dd3913132a9be0ca0abfaaaac19f7b08ce0946c822e7af2d712fc48d0843cdc61b667e331acb5ad5838443755ddee31a710e86b2c84"
}