curl --request POST \
  --url 'https://rpc-mainnet.solanatracker.io/?api_key=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "id": "45",
  "method": "isBlockhashValid",
  "params": [
    "AEJu9DSSSLggXFxpUYximTRt2iPh7snY74aEZDLydF7D",
    {
      "commitment": "processed"
    }
  ]
}
'

{
  "jsonrpc": "2.0",
  "id": "45",
  "result": {
    "context": {
      "slot": 2483
    },
    "value": false
  }
}