Extrinsic 4543-1

{
  "heartbeat": {
    "blockNumber": 4542,
    "sessionIndex": 75,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x54ff4f289ca7407aad4e95dde5be74038742c34d6fb2dbb1999a99213eb0ab348fe2925645fb62f5ffa97044363ebbddbc3f00d464d8a70a833ce60dfef2a083"
}