getBlockCommitment 사용 방법

# Replace 250000000 with a valid, recent slot number on Devnet/Mainnet
curl https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY -X POST -H "Content-Type: application/json" -d \
'{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getBlockCommitment",
  "params": [
    250000000 
  ]
}'

const { Connection } = require('@solana/web3.js');

async function getBlockCommitmentDetails() {
  const rpcUrl = 'https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY'; // Replace YOUR_API_KEY
  const connection = new Connection(rpcUrl, 'confirmed');
  
  // Replace with a valid, recent slot number on your target network
  const slotToQuery = 250000000; 

  try {
    // Note: getBlockCommitment is not directly available in @solana/web3.js Connection object.
    // You typically need to make a direct RPC call for this method.
    // The example below shows how to construct and send such a raw request.
    const response = await fetch(rpcUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        jsonrpc: '2.0',
        id: 1,
        method: 'getBlockCommitment',
        params: [slotToQuery],
      }),
    });
    const result = await response.json();

    if (result.error) {
      console.error(`Error fetching block commitment for slot ${slotToQuery}:`, result.error.message);
      return;
    }

    const blockCommitment = result.result;

    if (blockCommitment) {
      console.log(`Block Commitment for Slot ${slotToQuery}:`);
      console.log(`   Total Stake (Lamports): ${blockCommitment.totalStake}`);
      console.log(`   Commitment Array:`, blockCommitment.commitment ? blockCommitment.commitment : 'Not available/Unknown block');
      // The commitment array shows lamports committed at different depths.
      // A null commitment array usually means the block is not found or too old.
      // A non-null array where later entries are higher indicates increasing finality.
    } else {
      console.log(`Block commitment data for slot ${slotToQuery} not found.`);
    }
  } catch (error) {
    console.error(`Error fetching block commitment for slot ${slotToQuery}:`, error);
  }
}

getBlockCommitmentDetails();

import { createSolanaRpc } from "@solana/kit";

const rpc_url = "https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY";
const rpc = createSolanaRpc(rpc_url);

const slot_number = BigInt(5);

let blockCommitment = await rpc.getBlockCommitment(slot_number).send();

console.log("block commitment:", blockCommitment);