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Source: Full executable TypeScript in contract/src/examples/06-advanced-patterns/. This page summarizes the flow — read the source for complete per-step code.

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The Story

ArtFund has grown. They now manage dozens of active campaigns, multiple treasury contracts, and a growing catalog of physical products that need to be tracked on-chain. Their engineering team needs to optimize for performance and handle complex operational requirements:
  • Performance — Loading a dashboard that reads data from 10+ contracts should not require 10+ separate RPC calls. They need to batch reads into a single network round-trip.
  • Multi-role operations — Some operations on the same contract require different signers. For example, the protocol admin disburses fees, but the campaign creator withdraws funds.
  • Physical product tracking — Campaigns that ship physical goods need to register item metadata (dimensions, weight, category) in the ItemRegistry so logistics and customs can be automated.
  • Protocol configuration — The platform needs to read global and platform-scoped protocol parameters like buffer times, payment expirations, and campaign duration minimums.

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Steps

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Step 1: Multicall — Batch Reads

Instead of making N separate RPC calls, batch them into one round-trip using oak.multicall(). Each read is wrapped in a lazy function so they execute together. 
const gp = oak.globalParams(process.env.GLOBAL_PARAMS_ADDRESS! as `0x${string}`);
const campaign = oak.campaignInfo(process.env.CAMPAIGN_INFO_ADDRESS! as `0x${string}`);

const [platformCount, protocolFee, goalAmount, totalRaised, deadline] = await oak.multicall([
  () => gp.getNumberOfListedPlatforms(),
  () => gp.getProtocolFeePercent(),
  () => campaign.getGoalAmount(),
  () => campaign.getTotalRaisedAmount(),
  () => campaign.getDeadline(),
]);

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Step 2: Per-Entity Signer

In a browser dApp, the signer is resolved after the user connects their wallet. Pass it when creating the entity — all writes on that entity automatically use it. 
import { createWallet } from "@oaknetwork/contracts-sdk";

// Start with a read-only client
const oak = createOakContractsClient({
  chainId: CHAIN_IDS.CELO_TESTNET_SEPOLIA,
  rpcUrl: process.env.RPC_URL!,
});

// User connects their wallet — resolve the signer
const userSigner = createWallet(userPrivateKey, process.env.RPC_URL!, oak.config.chain);

// Create an entity with the user's signer
const treasury = oak.allOrNothingTreasury(treasuryAddress, { signer: userSigner });

// Writes automatically use userSigner
// await treasury.pledgeForAReward(backerAddr, pledgeToken, 0n, [rewardHash]);

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Step 3: Per-Call Signer

Different operations on the same contract require different signers. Pass the signer as the last argument on each call. 
const adminSigner = createWallet(
  process.env.ADMIN_PRIVATE_KEY! as `0x${string}`,
  process.env.RPC_URL!,
  oak.config.chain,
);
const creatorSigner = createWallet(
  process.env.CREATOR_PRIVATE_KEY! as `0x${string}`,
  process.env.RPC_URL!,
  oak.config.chain,
);

const treasury = oak.allOrNothingTreasury(treasuryAddress);

// Admin disburses fees
const feeTxHash = await treasury.disburseFees({ signer: adminSigner });
await oak.waitForReceipt(feeTxHash);

// Creator withdraws funds
const withdrawTxHash = await treasury.withdraw({ signer: creatorSigner });
await oak.waitForReceipt(withdrawTxHash);

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Step 4: Item Registry

For campaigns that ship physical products, register item metadata (dimensions, weight, category) on-chain. Supports single and batch registration. 
const vaseItemId = keccak256(toHex("handcrafted-vase-001"));

const vaseItem: Item = {
  actualWeight: 2500n,     // 2500 grams
  height: 300n,            // 300 mm
  width: 150n,
  length: 150n,
  category: keccak256(toHex("ceramics")),
  declaredCurrency: toHex("USD", { size: 32 }),
};

await itemRegistry.addItem(vaseItemId, vaseItem);

// Batch registration
const batchTxHash = await itemRegistry.addItemsBatch(
  [item1Id, item2Id],
  [item1, item2],
);

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Step 5: Registry Keys — Protocol Configuration

The protocol stores configuration values (buffer times, payment expirations, minimum campaign duration) in a data registry. Values can be global or scoped to a specific platform. 
import {
  DATA_REGISTRY_KEYS,
  scopedToPlatform,
} from "@oaknetwork/contracts-sdk";

// Global values
const bufferTime = await gp.getFromRegistry(DATA_REGISTRY_KEYS.BUFFER_TIME);
const maxPaymentExpiration = await gp.getFromRegistry(
  DATA_REGISTRY_KEYS.MAX_PAYMENT_EXPIRATION,
);
const minCampaignDuration = await gp.getFromRegistry(
  DATA_REGISTRY_KEYS.MINIMUM_CAMPAIGN_DURATION,
);

// Platform-scoped values
const platformHash = keccak256(toHex("artfund"));
const platformBufferTime = await gp.getFromRegistry(
  scopedToPlatform(DATA_REGISTRY_KEYS.BUFFER_TIME, platformHash),
);

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Step 6: Non-Blocking Receipt Lookup

oak.getReceipt(txHash) fetches the receipt for an already-mined transaction without blocking. Unlike waitForReceipt (which polls until inclusion), getReceipt returns immediately with the receipt or null if not yet mined. Useful for webhooks, indexers, and resuming past sessions. 
const receipt = await oak.getReceipt(txHash);

if (receipt) {
  console.log("Mined at block:", receipt.blockNumber);
  console.log("Gas used:", receipt.gasUsed);
} else {
  console.log("Transaction not yet mined — try again later");
}

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Step 7: Browser Wallet (MetaMask / Injected)

For frontend applications using MetaMask, Coinbase Wallet, or any browser extension that injects window.ethereum, the SDK provides createBrowserProvider and getSigner. Two usage patterns: Pattern A — Full configuration — provider and signer passed to the client up front, so every entity inherits the wallet. 
import {
  createBrowserProvider,
  getSigner,
  getChainFromId,
} from "@oaknetwork/contracts-sdk";

const chain = getChainFromId(CHAIN_IDS.CELO_TESTNET_SEPOLIA);
const provider = createBrowserProvider(window.ethereum, chain);
const signer = await getSigner(window.ethereum, chain);

const oak = createOakContractsClient({ chain, provider, signer });
Pattern B — Per-entity override — read-only client, signer attached to a specific entity. 
const oak = createOakContractsClient({
  chainId: CHAIN_IDS.CELO_TESTNET_SEPOLIA,
  rpcUrl: "https://forno.celo-sepolia.celo-testnet.org",
});

const signer = await getSigner(window.ethereum, chain);
const treasury = oak.allOrNothingTreasury(treasuryAddress, { signer });

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Step 8: Privy Wallet

Privy embedded wallets expose an EIP-1193 provider. Pass it to viem’s custom transport for both createPublicClient and createWalletClient, then pass chain, provider, and signer into createOakContractsClient — the same full-config pattern as the browser wallet example. 
import {
  createPublicClient,
  createWalletClient,
  custom,
  getChainFromId,
} from "@oaknetwork/contracts-sdk";

const chain = getChainFromId(CHAIN_IDS.CELO_TESTNET_SEPOLIA);
await wallet.switchChain(chain.id);

const ethereumProvider = await wallet.getEthereumProvider();

const provider = createPublicClient({
  chain,
  transport: custom(ethereumProvider),
});

const signer = createWalletClient({
  chain,
  transport: custom(ethereumProvider),
  account: wallet.address as `0x${string}`,
});

const oak = createOakContractsClient({ chain, provider, signer });