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Making Transfers inside Cloak

Introduction

Cloak is an exact copy of Scroll's EVM. As it is a full fledged EVM execution environment, one can do ERC20 token transfers or interact with smart contracts.

The simplest use case is to let users hold tokens in a wallet on Cloak (similar to a shielded account) and to make transfers to other users. In this document we will present this use case.

Making Token Transfers

See the full example at transfer.ts example in the @scroll-tech/cloak-js package.

To make ERC20 transfers (for L3 WETH or any other deposited token), simply call the token contract transfer function, just like you would on other EVM chains.

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import { abis, cloak } from '@scroll-tech/cloak-js';

const c = cloak('local-devnet');

// configure client with access token...

const hash = await l3Wallet.writeContract({
  address: c.contracts().ValidiumWeth,
  abi: abis.ERC20,
  functionName: 'transfer',
  args: [recipient.address, amount],
});

const receipt = await l3Client.waitForTransactionReceipt({ hash });

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import { abis, cloak } from '@scroll-tech/cloak-js';

const c = cloak('local-devnet');

// configure client with access token...

const validiumWeth = new Contract(
  c.contracts().ValidiumWeth,
  abis.ERC20,
  l3Wallet,
);

const tx = await validiumWeth.transfer(recipient.address, amount);

By default, this transaction and transaction receipt can only be queried by the sender and the recipient, as well as the chain admins. Other users cannot access this information.