Extrinsic 4412-1

{
  "heartbeat": {
    "blockNumber": 4411,
    "sessionIndex": 73,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x9453b4b765221bd2b524648c78531511302a6ab0536577375f635a933068a635e75a44a844a95d94a0c3ce5f142d34bab6d25ca7d05522d54d08555eb7a26d88"
}