Read storage, at a specific blockhash

In addition to querying the latest storage, you can make storage queries at a specific blockhash. Be aware that the node applies a pruning strategy and typically only keeps the last 256 blocks, unless run in archive mode.

// Import the API
const { ApiPromise } = require('@polkadot/api');
const { typesBundleForPolkadot } = require('@crustio/type-definitions');
// Our address for Alice on the dev chain
const ALICE = '5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY';
const BOB = '5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty';
async function main () {
// Create our API with a default connection to the local node
const api = await ApiPromise.create({
provider: new WsProvider('ws://'),
typesBundle: typesBundleForPolkadot
// Retrieve the last block header, extracting the hash and parentHash
const { hash, parentHash } = await api.rpc.chain.getHeader();
console.log(`last header hash ${hash.toHex()}`);
// Retrieve the balance at the preceding block for Alice. For at queries
// the format is always `.at(<blockhash>, ...params)`
const balance = await, ALICE);
console.log(`Alice's balance at ${parentHash.toHex()} was ${}`);
// Now perform a multi query, returning multiple balances at once
const balances = await api.query.system.account.multi([ALICE, BOB]);
console.log(`Current balances for Alice and Bob are ${balances[0]} and ${balances[1]}`);
main().catch(console.error).finally(() => process.exit());