chain_getBlockHash - Enjin RPC Method

Returns the block hash for a given block number on Enjin. This is the primary method for converting block numbers into block hashes, which are required by most other chain RPC methods.

Why Enjin? Build on the purpose-built NFT blockchain with protocol-level minting and $100M Metaverse Fund with NFT functions at protocol level, Fuel Tanks for subsidized fees, 700-1000 TPS, 6-second finality, and ERC-1155 standard pioneer.

When to Use This Method

chain_getBlockHash is fundamental for game developers, NFT creators, and enterprises building cross-chain digital assets:

• Historical Queries — Convert block numbers to hashes for state queries at specific heights on Enjin
• Block Navigation — Navigate the blockchain history for high-volume NFT minting (2,000+ per tx), gaming assets, and cross-chain NFT transfers via Paratoken standard
• Data Indexing — Build block number-to-hash mappings for indexers and explorers
• Cross-Reference — Translate block numbers from events or logs into hashes for detailed lookups

Code Examples

Common Use Cases

1. Block Range Iterator

Iterate over a range of blocks on Enjin for indexing:

async function iterateBlocks(api, startBlock, endBlock) {
  for (let num = startBlock; num <= endBlock; num++) {
    const hash = await api.rpc.chain.getBlockHash(num);
    const block = await api.rpc.chain.getBlock(hash);

    console.log(`Block #${num}: ${block.block.extrinsics.length} extrinsics`);
  }
}

2. Historical State Query

Query Enjin state at a specific block height:

async function getBalanceAtBlock(api, address, blockNumber) {
  const blockHash = await api.rpc.chain.getBlockHash(blockNumber);
  const apiAt = await api.at(blockHash);
  const account = await apiAt.query.system.account(address);

  return {
    blockNumber,
    free: account.data.free.toString(),
    reserved: account.data.reserved.toString()
  };
}

3. Genesis Hash Verification

Verify you are connected to the correct Enjin network:

async function verifyNetwork(api, expectedGenesisHash) {
  const genesisHash = await api.rpc.chain.getBlockHash(0);

  if (genesisHash.toHex() !== expectedGenesisHash) {
    throw new Error(`Wrong network! Expected ${expectedGenesisHash}, got ${genesisHash.toHex()}`);
  }

  console.log('Connected to correct network');
}

Error Handling

Related Methods

• chain_getBlock — Get full block data by hash
• chain_getHeader — Get block header by hash
• chain_getFinalizedHead — Get the latest finalized block hash