Utilities


Utilities

The utilities libraryopen in new window contains essential utilities for building on zkSync Era.

Info

  • This document describes common functions and constants you may need.
  • Functions used internally are not necessarily described.
  • Check the code for the full list.

Use the library

Access the library by importing it into your scripts.

import { utils } from "zksync-ethers";

Constants

Interfaces

zkSync Era main contract

export const ZKSYNC_MAIN_ABI = new utils.Interface(require("../abi/IZkSync.json"));

IERC20

For interacting with native tokens.

export const IERC20 = new utils.Interface(require("../abi/IERC20.json"));

IERC1271

For interacting with contract which implements ERC1271.

export const IERC1271 = new utils.Interface(require("../abi/IERC1271.json"));

Contract deployer

Used for deploying smart contracts.

export const CONTRACT_DEPLOYER = new utils.Interface(require("../abi/ContractDeployer.json"));

L1 messenger

Used for sending messages from zkSync Era to Ethereum.

export const L1_MESSENGER = new utils.Interface(require("../abi/IL1Messenger.json"));

L1 and L2 bridges

Bridge interface ABIs for L1 and L2.

export const L1_BRIDGE_ABI = new utils.Interface(require("../abi/IL1Bridge.json"));
export const L2_BRIDGE_ABI = new utils.Interface(require("../abi/IL2Bridge.json"));

NonceHolder

Used for managing deployment nonce.

export const NONCE_HOLDER_ABI = new ethers.Interface(require("../abi/INonceHolder.json"));

L1 to L2 alias offset

Used for applying and undoing aliases on addresses during bridging from L1 to L2.

export const L1_TO_L2_ALIAS_OFFSET = "0x1111000000000000000000000000000000001111";

Magic value

The value returned from isEIP1271SignatureCorrect to confirm signature correctness.

export const EIP1271_MAGIC_VALUE = "0x1626ba7e";

EIP712 transaction type

Constant representing an EIP712 transaction type.

export const EIP712_TX_TYPE = 0x71;

EIP712 structures

Collection of EIP712 structures with their types.

export const EIP712_TYPES = {
  Transaction: [
    { name: "txType", type: "uint256" },
    { name: "from", type: "uint256" },
    { name: "to", type: "uint256" },
    { name: "gasLimit", type: "uint256" },
    { name: "gasPerPubdataByteLimit", type: "uint256" },
    { name: "maxFeePerGas", type: "uint256" },
    { name: "maxPriorityFeePerGas", type: "uint256" },
    { name: "paymaster", type: "uint256" },
    { name: "nonce", type: "uint256" },
    { name: "value", type: "uint256" },
    { name: "data", type: "bytes" },
    { name: "factoryDeps", type: "bytes32[]" },
    { name: "paymasterInput", type: "bytes" },
  ],
};

Priority op transaction on L2

Constant representing a priority transaction operation on L2.

export const PRIORITY_OPERATION_L2_TX_TYPE = 0xff;

Max bytecode length

Used for ensuring bytecode length is not over the maximum allowed.

export const MAX_BYTECODE_LEN_BYTES = ((1 << 16) - 1) * 32;

Useful addresses

ETH token layer 1

export const ETH_ADDRESS = "0x0000000000000000000000000000000000000000";

ETH token alias on ZkSync Era

export const L2_ETH_TOKEN_ADDRESS = "0x000000000000000000000000000000000000800a";

Bootloader

export const BOOTLOADER_FORMAL_ADDRESS = "0x0000000000000000000000000000000000008001";

Contract deployer

export const CONTRACT_DEPLOYER_ADDRESS = "0x0000000000000000000000000000000000008006";

L1 messenger

export const L1_MESSENGER_ADDRESS = "0x0000000000000000000000000000000000008008";

Nonce holder

export const NONCE_HOLDER_ADDRESS = "0x0000000000000000000000000000000000008003";

Gas

DEFAULT_GAS_PER_PUBDATA_LIMIT

  • Use a large amount of gas per pubdata for signing on layer 2.
  • The amount ensures any reasonable limit is accepted.

Info

  • The operator is NOT required to use the actual value and can use any value up to that signed by the user.
export const DEFAULT_GAS_PER_PUBDATA_LIMIT = 50000;

REQUIRED_L1_TO_L2_GAS_PER_PUBDATA_LIMIT

The current required gas per pubdata for L1->L2 transactions.

export const REQUIRED_L1_TO_L2_GAS_PER_PUBDATA_LIMIT = 800;

Functions

applyL1ToL2Alias

Converts the address that submitted a transaction to the inbox on L1 to the msg.sender viewed on L2.

Returns the msg.sender of the L1->L2 transaction as the address of the contract that initiated the transaction.

More info

  1. During a normal transaction, if contract A calls contract B, the msg.sender is A.
  2. During L1->L2 communication, if an EOA X calls contract B, the msg.sender is X.
  3. During L1->L2 communication, if a contract A calls contract B, the msg.sender is applyL1ToL2Alias(A).

Inputs

ParameterTypeDescription
addressstringContract address.
export function applyL1ToL2Alias(address: string): string;

Example

const l1ContractAddress = "0x702942B8205E5dEdCD3374E5f4419843adA76Eeb";
const l2ContractAddress = utils.applyL1ToL2Alias(l1ContractAddress);
// l2ContractAddress = "0x813A42B8205E5DedCd3374e5f4419843ADa77FFC"

See also undol1tol2alias.

checkBaseCost

Checks if the transaction's base cost is greater than the provided value, which covers the transaction's cost. Throws an error if it is not.

Inputs

ParameterTypeDescription
baseCostBigNumberishtransaction's base cost.
valueBigNumberishvalue which covers the transaction's cost.
async function checkBaseCost(baseCost: ethers.BigNumberish, value: ethers.BigNumberish | Promise<ethers.BigNumberish>): Promise<void>;

Example

const baseCost = 100;
const value = 99;
try {
  await utils.checkBaseCost(baseCost, value);
} catch (e) {
  // e.message = `The base cost of performing the priority operation is higher than the provided value parameter for the transaction: baseCost: ${baseCost}, provided value: ${value}`,
}

create2Address

Generates a future-proof contract address using salt plus bytecode which allows determination of an address before deployment.

Note

  • The zkSync Era implementation is slightly different from Ethereum.

Inputs

ParameterTypeDescription
senderAddressSender address.
bytecodeHashBytesLikeOutput from zkSolc.
saltBytesLikeRandomization element.
inputBytesLikeABI encoded constructor arguments.
export function create2Address(sender: Address, bytecodeHash: BytesLike, salt: BytesLike, input: BytesLike): string;

Example

const address = utils.create2Address("0x36615Cf349d7F6344891B1e7CA7C72883F5dc049", "0x010001cb6a6e8d5f6829522f19fa9568660e0a9cd53b2e8be4deb0a679452e41", "0x01", "0x01");
// address = "0x29bac3E5E8FFE7415F97C956BFA106D70316ad50"

Tips

The prefix is equal to keccak256("zksyncCreate").

createAddress

Generates a contract address from deployer's account and nonce.

Inputs

ParameterTypeDescription
senderAddressSender address.
senderNonceBigNumberishSender nonce.
export function createAddress(sender: Address, senderNonce: BigNumberish): string;

Example

const address = utils.createAddress("0x36615Cf349d7F6344891B1e7CA7C72883F5dc049", 1);
// address = "0x4B5DF730c2e6b28E17013A1485E5d9BC41Efe021"

eip712TxHash

Returns the hash of an EIP712 transaction.

Inputs

ParameterTypeDescription
transactionanyEIP-712 transaction.
ethSignature?EthereumSignatureECDSA signature of the transaction (optional).
function eip712TxHash(transaction: any, ethSignature?: EthereumSignature): string;

estimateDefaultBridgeDepositL2Gas

Returns an estimation of L2 gas required for token bridging via the default ERC20 bridge.

Inputs

ParameterTypeDescription
providerL1ProviderEthers provider.
providerL2ProviderzkSync provider.
tokenAddressToken address.
amountBigNumberishDeposit amount.
toAddressRecipient address.
from?AddressSender address (optional).
gasPerPubdataByte?BigNumberishCurrent gas per byte of pubdata (optional).
export async function estimateDefaultBridgeDepositL2Gas(
  providerL1: ethers.providers.Provider,
  providerL2: Provider,
  token: Address,
  amount: BigNumberish,
  to: Address,
  from?: Address,
  gasPerPubdataByte?: BigNumberish
): Promise<bigint>;

getDeployedContracts

Returns a log containing details of all deployed contracts related to a transaction receipt parameter.

Inputs

ParameterTypeDescription
receiptTransactionReceiptTransaction receipt.
export function getDeployedContracts(receipt: ethers.providers.TransactionReceipt): DeploymentInfo[];

getERC20BridgeCalldata

Returns the calldata sent by an L1 ERC20 bridge to its L2 counterpart during token-bridging.

Inputs

ParameterTypeDescription
l1TokenAddressAddressToken address on L1.
l1SenderAddressSender address on L1.
l2ReceiverAddressRecipient address on L2.
amountBigNumberishGas fee for the number of tokens to bridge.
bridgeDataBytesLikeData
export async function getERC20BridgeCalldata(l1TokenAddress: string, l1Sender: string, l2Receiver: string, amount: BigNumberish, bridgeData: BytesLike): Promise<string>;

getL2HashFromPriorityOp

Returns the hash of the L2 priority operation from a given transaction receipt and L2 address.

Inputs

ParameterTypeDescription
txReceiptTransactionReceiptReceipt of the L1 transaction.
zkSyncAddressAddressAddress of zkSync Era main contract.
export function getL2HashFromPriorityOp(txReceipt: ethers.providers.TransactionReceipt, zkSyncAddress: Address): string;

getHashedL2ToL1Msg

Returns a keccak encoded message with a given sender address and block number from the L1 messenger contract.

Inputs

ParameterTypeDescription
senderAddressThe sender of the message on L2.
msgBytesLikeEncoded message.
txNumberInBlocknumberIndex of the transaction in the block.
export function getHashedL2ToL1Msg(sender: Address, msg: BytesLike, txNumberInBlock: number): string;

Example

const withdrawETHMessage = "0x6c0960f936615cf349d7f6344891b1e7ca7c72883f5dc04900000000000000000000000000000000000000000000000000000001a13b8600";
const withdrawETHMessageHash = utils.getHashedL2ToL1Msg("0x36615Cf349d7F6344891B1e7CA7C72883F5dc049", withdrawETHMessage, 0);
// withdrawETHMessageHash = "0xd8c80ecb64619e343f57c3b133c6c6d8dd0572dd3488f1ca3276c5b7fd3a938d"

hashBytecode

Returns the hash of given bytecode.

Inputs

ParameterTypeDescription
bytecodeBytesLikeBytecode.
export function hashBytecode(bytecode: ethers.BytesLike): Uint8Array;

Examples

const bytecode =
  "0x000200000000000200010000000103550000006001100270000000130010019d0000008001000039000000400010043f0000000101200190000000290000c13d0000000001000031000000040110008c000000420000413d0000000101000367000000000101043b000000e001100270000000150210009c000000310000613d000000160110009c000000420000c13d0000000001000416000000000110004c000000420000c13d000000040100008a00000000011000310000001702000041000000200310008c000000000300001900000000030240190000001701100197000000000410004c000000000200a019000000170110009c00000000010300190000000001026019000000000110004c000000420000c13d00000004010000390000000101100367000000000101043b000000000010041b0000000001000019000000490001042e0000000001000416000000000110004c000000420000c13d0000002001000039000001000010044300000120000004430000001401000041000000490001042e0000000001000416000000000110004c000000420000c13d000000040100008a00000000011000310000001702000041000000000310004c000000000300001900000000030240190000001701100197000000000410004c000000000200a019000000170110009c00000000010300190000000001026019000000000110004c000000440000613d00000000010000190000004a00010430000000000100041a000000800010043f0000001801000041000000490001042e0000004800000432000000490001042e0000004a00010430000000000000000000000000000000000000000000000000000000000000000000000000ffffffff0000000200000000000000000000000000000040000001000000000000000000000000000000000000000000000000000000000000000000000000006d4ce63c0000000000000000000000000000000000000000000000000000000060fe47b18000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000080000000000000000000000000000000000000000000000000000000000000000000000000000000009c8c8fa789967eb514f3ec9def748480945cc9b10fcbd1a19597d924eb201083";
const hashedBytecode = utils.hashBytecode(bytecode);
/* 
hashedBytecode =  new Uint8Array([
    1, 0, 0, 27, 57, 231, 154, 55, 0, 164, 201, 96, 244, 120, 23, 112, 54, 34, 224, 133,
    160, 122, 88, 164, 112, 80, 0, 134, 48, 138, 74, 16,
  ]),
);
 */

isECDSASignatureCorrect

Validates signatures from non-contract account addresses (EOA). Provides similar functionality in ethers.js but returns true if the validation process succeeds, otherwise returns false.

Called from isSignatureCorrect for non-contract account addresses.

Inputs

ParameterTypeDescription
addressstringAddress which signs msgHash.
msgHashAddressHash of the message.
signatureSignatureLikeEthers signature.
function isECDSASignatureCorrect(address: string, msgHash: string, signature: SignatureLike): boolean;

Examples

import { Wallet, utils } from "zksync-ethers";

const ADDRESS = "<WALLET_ADDRESS>";
const PRIVATE_KEY = "<WALLET_PRIVATE_KEY>";

const message = "Hello, world!";
const signature = await new Wallet(PRIVATE_KEY).signMessage(message);
// ethers.Wallet can be used as well
// const signature =  await new ethers.Wallet(PRIVATE_KEY).signMessage(message);

const isValidSignature = await utils.isECDSASignatureCorrect(ADDRESS, message, signature);
// isValidSignature = true

See also isMessageSignatureCorrect() and isTypedDataSignatureCorrect() to validate signatures.

isEIP1271SignatureCorrect

Called from isSignatureCorrect for contract account addresses, the function returns true if the validation process results in the EIP1271_MAGIC_VALUE.

Inputs

ParameterTypeDescription
providerProviderProvider.
addressstringSender address.
msgHashstringThe hash of the message.
signatureSignatureLikeEthers signature.
async function isEIP1271SignatureCorrect(provider: Provider, address: string, msgHash: string, signature: SignatureLike): Promise<boolean>;

See also isMessageSignatureCorrect() and isTypedDataSignatureCorrect() to validate signatures.

isETH

Returns true if token represents ETH on L1 or L2.

Inputs

ParameterTypeDescription
tokenAddressThe token address.
export function isETH(token: Address);

Example

const isL1ETH = utils.isETH(utils.ETH_ADDRESS); // true
const isL2ETH = utils.isETH(utils.L2_ETH_TOKEN_ADDRESS); // true

isMessageSignatureCorrect

Returns true if account abstraction signature is correct.

Inputs

ParameterTypeDescription
providerProviderProvider.
addressstringSender address.
messagestringThe hash of the message.
signatureSignatureLikeEthers signature.
export async function isMessageSignatureCorrect(provider: Provider, address: string, message: ethers.Bytes | string, signature: SignatureLike): Promise<boolean>;

Example

import { Wallet, utils, Provider } from "zksync-ethers";

const ADDRESS = "<WALLET_ADDRESS>";
const PRIVATE_KEY = "<WALLET_PRIVATE_KEY>";
const provider = Provider.getDefaultProvider(types.Network.Sepolia);

const message = "Hello, world!";
const signature = await new Wallet(PRIVATE_KEY).signMessage(message);
// ethers.Wallet can be used as well
// const signature =  await new ethers.Wallet(PRIVATE_KEY).signMessage(message);

const isValidSignature = await utils.isMessageSignatureCorrect(provider, ADDRESS, message, signature);
// isValidSignature = true

isSignatureCorrect

Called from isMessageSignatureCorrect and isTypedDataSignatureCorrect. Returns true if account abstraction EIP712 signature is correct.

Inputs

ParameterTypeDescription
providerProviderProvider.
addressstringSender address.
msgHashstringThe hash of the message.
signatureSignatureLikeEthers signature.
async function isSignatureCorrect(provider: Provider, address: string, msgHash: string, signature: SignatureLike): Promise<boolean>;

isTypedDataSignatureCorrect

Returns true if account abstraction EIP712 signature is correct.

Inputs

ParameterTypeDescription
providerProviderProvider.
addressstringSender address.
domainTypedDataDomainDomain data.
typesMap<string, TypedDataField>Map of records pointing from field name to field type.
valueRecord<string, any>A single record value.
signatureSignatureLikeEthers signature.
export async function isTypedDataSignatureCorrect(
  provider: Provider,
  address: string,
  domain: TypedDataDomain,
  types: Record<string, Array<TypedDataField>>,
  value: Record<string, any>,
  signature: SignatureLike
): Promise<boolean>;

Example

import { Wallet, utils, Provider, EIP712Signer } from "zksync-ethers";

const ADDRESS = "<WALLET_ADDRESS>";
const PRIVATE_KEY = "<WALLET_PRIVATE_KEY>";
const provider = Provider.getDefaultProvider(types.Network.Sepolia);

const tx: types.TransactionRequest = {
  type: 113,
  chainId: 270,
  from: ADDRESS,
  to: "0xa61464658AfeAf65CccaaFD3a512b69A83B77618",
  value: BigInt(7_000_000),
};

const eip712Signer = new EIP712Signer(
  new Wallet(PRIVATE_KEY), // or new ethers.Wallet(PRIVATE_KEY),
  Number((await provider.getNetwork()).chainId)
);

const signature = await eip712Signer.sign(tx);

const isValidSignature = await utils.isTypedDataSignatureCorrect(provider, ADDRESS, await eip712Signer.getDomain(), utils.EIP712_TYPES, EIP712Signer.getSignInput(tx), signature);
// isValidSignature = true

parseEip712

Parses an EIP712 transaction from a payload.

Inputs

ParameterTypeDescription
payloadBytesLikePayload.
export function parseEip712(payload: ethers.BytesLike): TransactionLike;

Example

import { types } from "zksync-ethers";

const serializedTx =
  "0x71f87f8080808094a61464658afeaf65cccaafd3a512b69a83b77618830f42408001a073a20167b8d23b610b058c05368174495adf7da3a4ed4a57eb6dbdeb1fafc24aa02f87530d663a0d061f69bb564d2c6fb46ae5ae776bbd4bd2a2a4478b9cd1b42a82010e9436615cf349d7f6344891b1e7ca7c72883f5dc04982c350c080c0";
const tx: types.TransactionLike = utils.parseEip712(serializedTx);
/*
tx: types.TransactionLike = {
  type: 113,
  nonce: 0,
  maxPriorityFeePerGas: BigInt(0),
  maxFeePerGas: BigInt(0),
  gasLimit: BigInt(0),
  to: "0xa61464658AfeAf65CccaaFD3a512b69A83B77618",
  value: BigInt(1000000),
  data: "0x",
  chainId: BigInt(270),
  from: "0x36615Cf349d7F6344891B1e7CA7C72883F5dc049",
  customData: {
    gasPerPubdata: BigInt(50000),
    factoryDeps: [],
    customSignature: "0x",
    paymasterParams: null,
  },
  hash: "0x9ed410ce33179ac1ff6b721060605afc72d64febfe0c08cacab5a246602131ee",
};
 */

serializeEip712

Serializes an EIP712 transaction and include a signature if it is provided. Throws an error if:

  • transaction.customData.customSignature is an empty string. The transaction should be signed and the transaction.customData.customSignature field should be populated with the signature. It should not be specified if the transaction is not signed.
  • transaction.chainId is not provided.
  • transaction.from is not provided.

Inputs

ParameterTypeDescription
transactionTransactionLikeTransaction that needs to be serialized.
signature?SignatureLikeEthers signature that needs to be included in transactions (optional).
export function serializeEip712(transaction: TransactionLike, signature?: ethers.SignatureLike): string;

Examples

Serialize EIP712 transaction without signature.

const serializedTx = utils.serializeEip712({ chainId: 270, from: "0x36615Cf349d7F6344891B1e7CA7C72883F5dc049" }, null);

// serializedTx = "0x71ea8080808080808082010e808082010e9436615cf349d7f6344891b1e7ca7c72883f5dc04982c350c080c0"

Serialize EIP712 transaction with signature.

const signature = ethers.Signature.from("0x73a20167b8d23b610b058c05368174495adf7da3a4ed4a57eb6dbdeb1fafc24aaf87530d663a0d061f69bb564d2c6fb46ae5ae776bbd4bd2a2a4478b9cd1b42a");

const serializedTx = utils.serializeEip712(
  {
    chainId: 270,
    from: "0x36615Cf349d7F6344891B1e7CA7C72883F5dc049",
    to: "0xa61464658AfeAf65CccaaFD3a512b69A83B77618",
    value: 1_000_000,
  },
  signature
);
// serializedTx = "0x71f87f8080808094a61464658afeaf65cccaafd3a512b69a83b77618830f42408001a073a20167b8d23b610b058c05368174495adf7da3a4ed4a57eb6dbdeb1fafc24aa02f87530d663a0d061f69bb564d2c6fb46ae5ae776bbd4bd2a2a4478b9cd1b42a82010e9436615cf349d7f6344891b1e7ca7c72883f5dc04982c350c080c0"

sleep

Common sleep function that pauses execution for a number of milliseconds.

Inputs

ParameterTypeDescription
millisnumberNumber of milliseconds.
export function sleep(millis: number);

undoL1ToL2Alias

Converts and returns the msg.sender viewed on L2 to the address that submitted a transaction to the inbox on L1.

Inputs

ParameterTypeDescription
addressstringSender address.
export function undoL1ToL2Alias(address: string): string;

Example

const l2ContractAddress = "0x813A42B8205E5DedCd3374e5f4419843ADa77FFC";
const l1ContractAddress = utils.undoL1ToL2Alias(l2ContractAddress);
// const l1ContractAddress = "0x702942B8205E5dEdCD3374E5f4419843adA76Eeb"

See also applyl1tol2alias.