curl --request POST \
  --url 'https://rpc-mainnet.solanatracker.io/?api_key=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "id": "db16f277-1a22-41ff-9f85-f37e2cd77900",
  "method": "getBlockProduction",
  "params": [
    {
      "commitment": "finalized",
      "identity": "85iYT5RuzRTDgjyRa3cP8SYhM2j21fj7NhfJ3peu1DPr",
      "range": {
        "firstSlot": 0,
        "lastSlot": 9887
      }
    }
  ]
}
'

{
  "jsonrpc": "2.0",
  "id": "<string>",
  "result": {
    "context": {
      "slot": 9887
    },
    "value": {
      "byIdentity": {
        "85iYT5RuzRTDgjyRa3cP8SYhM2j21fj7NhfJ3peu1DPr": [
          9888,
          9886
        ]
      },
      "range": {
        "firstSlot": 0,
        "lastSlot": 9887
      }
    }
  }
}