curl --fail-with-body "$THORNODE_RPC_URL" \
  --header 'content-type: application/json' \
  --data '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getBlock",
    "params": [
      439749081,
      {
        "encoding": "json",
        "transactionDetails": "signatures",
        "rewards": false,
        "maxSupportedTransactionVersion": 0
      }
    ]
  }'

const body = {
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getBlock",
  "params": [
    439749081,
    {
      "encoding": "json",
      "transactionDetails": "signatures",
      "rewards": false,
      "maxSupportedTransactionVersion": 0
    }
  ]
};

const response = await fetch(process.env.THORNODE_RPC_URL, {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify(body),
});
const { result, error } = await response.json();
console.log(result ?? error);

{
  "jsonrpc": "2.0",
  "result": {
    "blockHeight": 417799642,
    "blockTime": 1786928022,
    "blockhash": "3Q5KezdAVJreiW7AMHUokyA9s1Uy81vRf6eZfdNgTVbx",
    "parentSlot": 439749080,
    "previousBlockhash": "WcbhwGe26avXk91j6VpM9LgQxJ2YAsqksKqdVd7yLQc",
    "signatures": [
      "4yEd4nELJeDu5LEJVqnTDMN33jYLEwhdV3DrzW2ujozTkg7Vob3iWg9GxDutG7AtweTS4R3e3KpcMfWPEYKfbktz",
      "4nerjFi6tTQ3WA5uQWj23JjTTxRWDvL6Q9tY2mKwVXwh7RXLU8Cra7zV3iaDYpA5zVXXJhPrCohwuaxxqrdafrV7",
      "3GHaLUbYSo6KKhQQzcLnoTyfMwujz4yjuJkT4hmC1MvHnz35Eerrx6ZWPLaVb2yxkYyBDhi5DS8Cwc6iqrPJ4kio",
      "..."
    ]
  },
  "id": 1
}