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utils.ts
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import BigNumber from 'bignumber.js'
import { WyvernProtocol } from 'wyvern-js'
import * as ethUtil from 'ethereumjs-util'
import * as _ from 'lodash'
import * as Web3 from 'web3'
import * as WyvernSchemas from 'wyvern-schemas'
import { WyvernAtomicizerContract } from 'wyvern-js/lib/abi_gen/wyvern_atomicizer'
import { AnnotatedFunctionABI, FunctionInputKind, HowToCall } from 'wyvern-js/lib/types'
import { OpenSeaPort } from '../src'
import { ECSignature, Order, OrderSide, SaleKind, Web3Callback, TxnCallback, OrderJSON, UnhashedOrder, OpenSeaAsset, OpenSeaAssetBundle, UnsignedOrder, WyvernAsset } from './types'
export const NULL_ADDRESS = WyvernProtocol.NULL_ADDRESS
export const NULL_BLOCK_HASH = '0x0000000000000000000000000000000000000000000000000000000000000000'
export const OPENSEA_FEE_RECIPIENT = '0x5b3256965e7c3cf26e11fcaf296dfc8807c01073'
export const DEP_INFURA_KEY = 'e8695bce67944848aa95459fac052f8e'
export const MAINNET_PROVIDER_URL = 'https://eth-mainnet.alchemyapi.io/jsonrpc/y5dLONzfAJh-oCY02DCP3UWCT2pSEXMo'
export const RINKEBY_PROVIDER_URL = 'https://eth-rinkeby.alchemyapi.io/jsonrpc/-yDg7wmgGw5LdsP4p4kyxRYuDzCkXtoI'
export const INVERSE_BASIS_POINT = 10000
export const MAX_UINT_256 = WyvernProtocol.MAX_UINT_256
export const WYVERN_EXCHANGE_ADDRESS_MAINNET = "0x7be8076f4ea4a4ad08075c2508e481d6c946d12b"
export const WYVERN_EXCHANGE_ADDRESS_RINKEBY = "0x5206e78b21ce315ce284fb24cf05e0585a93b1d9"
export const DEFAULT_BUYER_FEE_BASIS_POINTS = 0
export const DEFAULT_SELLER_FEE_BASIS_POINTS = 250
export const OPENSEA_SELLER_BOUNTY_BASIS_POINTS = 100
export const DEFAULT_MAX_BOUNTY = DEFAULT_SELLER_FEE_BASIS_POINTS
export const MAX_ERROR_LENGTH = 120
export const MIN_EXPIRATION_SECONDS = 10
export const ORDER_MATCHING_LATENCY_SECONDS = 60 * 60 * 24 * 7
export const SELL_ORDER_BATCH_SIZE = 2
export const DEFAULT_GAS_INCREASE_FACTOR = 1.1
const proxyABI: any = {'constant': false, 'inputs': [{'name': 'dest', 'type': 'address'}, {'name': 'howToCall', 'type': 'uint8'}, {'name': 'calldata', 'type': 'bytes'}], 'name': 'proxy', 'outputs': [{'name': 'success', 'type': 'bool'}], 'payable': false, 'stateMutability': 'nonpayable', 'type': 'function'}
const proxyAssertABI: any = {'constant': false, 'inputs': [{'name': 'dest', 'type': 'address'}, {'name': 'howToCall', 'type': 'uint8'}, {'name': 'calldata', 'type': 'bytes'}], 'name': 'proxyAssert', 'outputs': [], 'payable': false, 'stateMutability': 'nonpayable', 'type': 'function'}
// OTHER
const txCallbacks: {[key: string]: TxnCallback[]} = {}
/**
* Promisify a callback-syntax web3 function
* @param inner callback function that accepts a Web3 callback function and passes
* it to the Web3 function
*/
export async function promisify<T>(
inner: (fn: Web3Callback<T>) => void
) {
return new Promise<T>((resolve, reject) =>
inner((err, res) => {
if (err) { reject(err) }
resolve(res)
})
)
}
const track = (web3: Web3, txHash: string, onFinalized: TxnCallback) => {
if (txCallbacks[txHash]) {
txCallbacks[txHash].push(onFinalized)
} else {
txCallbacks[txHash] = [onFinalized]
const poll = async () => {
const tx = await promisify<Web3.Transaction>(c => web3.eth.getTransaction(txHash, c))
if (tx && tx.blockHash && tx.blockHash !== NULL_BLOCK_HASH) {
const receipt = await promisify<Web3.TransactionReceipt | null>(c => web3.eth.getTransactionReceipt(txHash, c))
if (!receipt) {
// Hack: assume success if no receipt
console.warn('No receipt found for ', txHash)
}
const status = receipt
? parseInt((receipt.status || "0").toString()) == 1
: true
txCallbacks[txHash].map(f => f(status))
delete txCallbacks[txHash]
} else {
setTimeout(poll, 1000)
}
}
poll().catch()
}
}
export const confirmTransaction = async (web3: Web3, txHash: string) => {
return new Promise((resolve, reject) => {
track(web3, txHash, (didSucceed: boolean) => {
if (didSucceed) {
resolve("Transaction complete!")
} else {
reject(new Error(`Transaction failed :( You might have already completed this action. See more on the mainnet at etherscan.io/txn/${txHash}`))
}
})
})
}
export const assetFromJSON = (asset: any): OpenSeaAsset => {
const isAnimated = asset.image_url && asset.image_url.endsWith('.gif')
const isSvg = asset.image_url && asset.image_url.endsWith('.svg')
const fromJSON: OpenSeaAsset = {
tokenId: asset.token_id.toString(),
tokenAddress: asset.asset_contract.address,
name: asset.name,
description: asset.description,
owner: asset.owner,
assetContract: {
name: asset.asset_contract.name,
description: asset.asset_contract.description,
address: asset.asset_contract.address,
tokenSymbol: asset.asset_contract.symbol,
buyerFeeBasisPoints: asset.asset_contract.buyer_fee_basis_points,
sellerFeeBasisPoints: asset.asset_contract.seller_fee_basis_points,
openseaBuyerFeeBasisPoints: asset.asset_contract.opensea_buyer_fee_basis_points,
openseaSellerFeeBasisPoints: asset.asset_contract.opensea_seller_fee_basis_points,
devBuyerFeeBasisPoints: asset.asset_contract.dev_buyer_fee_basis_points,
devSellerFeeBasisPoints: asset.asset_contract.dev_seller_fee_basis_points,
imageUrl: asset.asset_contract.image_url,
stats: asset.asset_contract.stats,
traits: asset.asset_contract.traits,
externalLink: asset.asset_contract.external_link,
wikiLink: asset.asset_contract.wiki_link,
},
orders: asset.orders ? asset.orders.map(orderFromJSON) : null,
sellOrders: asset.sell_orders ? asset.sell_orders.map(orderFromJSON) : null,
buyOrders: asset.buy_orders ? asset.buy_orders.map(orderFromJSON) : null,
isPresale: asset.is_presale,
// Don't use previews if it's a special image
imageUrl: isAnimated || isSvg
? asset.image_url
: (asset.image_preview_url || asset.image_url),
imagePreviewUrl: asset.image_preview_url,
imageUrlOriginal: asset.image_original_url,
imageUrlThumbnail: asset.image_thumbnail_url,
externalLink: asset.external_link,
openseaLink: asset.permalink,
traits: asset.traits,
numSales: asset.num_sales,
lastSale: asset.last_sale,
backgroundColor: asset.background_color ? `#${asset.background_color}` : null,
}
// If orders were included, put them in sell/buy order groups
if (fromJSON.orders && !fromJSON.sellOrders) {
fromJSON.sellOrders = fromJSON.orders.filter(o => o.side == OrderSide.Sell)
}
if (fromJSON.orders && !fromJSON.buyOrders) {
fromJSON.buyOrders = fromJSON.orders.filter(o => o.side == OrderSide.Buy)
}
return fromJSON
}
export const assetBundleFromJSON = (asset_bundle: any): OpenSeaAssetBundle => {
const fromJSON: OpenSeaAssetBundle = {
maker: asset_bundle.maker,
assets: asset_bundle.assets.map(assetFromJSON),
name: asset_bundle.name,
slug: asset_bundle.slug,
description: asset_bundle.description,
externalLink: asset_bundle.external_link,
permalink: asset_bundle.permalink,
sellOrders: asset_bundle.sell_orders ? asset_bundle.sell_orders.map(orderFromJSON) : null
}
return fromJSON
}
export const tokenFromJSON = (token: any): WyvernSchemas.FungibleToken => {
const fromJSON: WyvernSchemas.FungibleToken = {
name: token.name,
symbol: token.symbol,
decimals: token.decimals,
address: token.address,
imageUrl: token.image_url,
ethPrice: token.eth_price
}
return fromJSON
}
export const orderFromJSON = (order: any): Order => {
const fromJSON: Order = {
hash: order.order_hash || order.hash,
cancelledOrFinalized: order.cancelled || order.finalized,
markedInvalid: order.marked_invalid,
metadata: order.metadata,
exchange: order.exchange,
makerAccount: order.maker,
takerAccount: order.maker,
// Use string address to conform to Wyvern Order schema
maker: order.maker.address,
taker: order.taker.address,
makerRelayerFee: new BigNumber(order.maker_relayer_fee),
takerRelayerFee: new BigNumber(order.taker_relayer_fee),
makerProtocolFee: new BigNumber(order.maker_protocol_fee),
takerProtocolFee: new BigNumber(order.taker_protocol_fee),
makerReferrerFee: new BigNumber(order.maker_referrer_fee || 0),
waitingForBestCounterOrder: order.fee_recipient.address == NULL_ADDRESS,
feeMethod: order.fee_method,
feeRecipientAccount: order.fee_recipient,
feeRecipient: order.fee_recipient.address,
side: order.side,
saleKind: order.sale_kind,
target: order.target,
howToCall: order.how_to_call,
calldata: order.calldata,
replacementPattern: order.replacement_pattern,
staticTarget: order.static_target,
staticExtradata: order.static_extradata,
paymentToken: order.payment_token,
basePrice: new BigNumber(order.base_price),
extra: new BigNumber(order.extra),
currentBounty: new BigNumber(order.current_bounty || 0),
currentPrice: new BigNumber(order.current_price || 0),
listingTime: new BigNumber(order.listing_time),
expirationTime: new BigNumber(order.expiration_time),
salt: new BigNumber(order.salt),
v: parseInt(order.v),
r: order.r,
s: order.s,
paymentTokenContract: order.payment_token_contract ? tokenFromJSON(order.payment_token_contract) : undefined,
asset: order.asset ? assetFromJSON(order.asset) : undefined,
assetBundle: order.asset_bundle ? assetBundleFromJSON(order.asset_bundle) : undefined
}
// Use most recent price calc, to account for latency
// TODO is this necessary?
fromJSON.currentPrice = estimateCurrentPrice(fromJSON)
return fromJSON
}
/**
* Convert an order to JSON, hashing it as well if necessary
* @param order order (hashed or unhashed)
*/
export const orderToJSON = (order: Order | UnhashedOrder): OrderJSON => {
const asJSON: any = {
exchange: order.exchange.toLowerCase(),
maker: order.maker.toLowerCase(),
taker: order.taker.toLowerCase(),
makerRelayerFee: order.makerRelayerFee.toString(),
takerRelayerFee: order.takerRelayerFee.toString(),
makerProtocolFee: order.makerProtocolFee.toString(),
takerProtocolFee: order.takerProtocolFee.toString(),
makerReferrerFee: order.makerReferrerFee.toString(),
feeMethod: order.feeMethod.toString(),
feeRecipient: order.feeRecipient.toLowerCase(),
side: order.side.toString(),
saleKind: order.saleKind.toString(),
target: order.target.toLowerCase(),
howToCall: order.howToCall.toString(),
calldata: order.calldata,
replacementPattern: order.replacementPattern,
staticTarget: order.staticTarget.toLowerCase(),
staticExtradata: order.staticExtradata,
paymentToken: order.paymentToken.toLowerCase(),
basePrice: order.basePrice.toString(),
extra: order.extra.toString(),
listingTime: order.listingTime.toString(),
expirationTime: order.expirationTime.toString(),
salt: order.salt.toString()
}
const hash = 'hash' in order ? order.hash : getOrderHash(asJSON)
if ('v' in order) {
asJSON.v = order.v
asJSON.r = order.r
asJSON.s = order.s
}
asJSON.hash = hash
asJSON.metadata = order.metadata
return asJSON
}
// Taken from Wyvern demo exchange
export const findAsset = async (
web3: Web3,
{account, proxy, wyAsset, schema}:
{account: string; proxy: string; wyAsset: any; schema: any}
) => {
let owner
const ownerOf = schema.functions.ownerOf
if (ownerOf) {
const abi = ownerOf(wyAsset)
const contract = web3.eth.contract([abi]).at(abi.target)
if (abi.inputs.filter((x: any) => x.value === undefined).length === 0) {
owner = await promisify<string>(c => contract[abi.name].call(...abi.inputs.map((i: any) => i.value.toString()), c))
owner = owner.toLowerCase()
}
}
/* This is a bit Ethercraft-specific. */
let proxyCount
let myCount
const countOf = schema.functions.countOf
if (countOf) {
const abi = countOf(wyAsset)
const contract = web3.eth.contract([abi]).at(abi.target)
if (proxy) {
proxyCount = await promisify<BigNumber>(c => contract[abi.name].call([proxy], c))
proxyCount = proxyCount.toNumber()
} else {
proxyCount = 0
}
myCount = await promisify<BigNumber>(c => contract[abi.name].call([account], c))
myCount = myCount.toNumber()
}
if (owner !== undefined) {
if (proxy && owner.toLowerCase() === proxy.toLowerCase()) {
return 'proxy'
} else if (owner.toLowerCase() === account.toLowerCase()) {
return 'account'
} else if (owner === '0x') {
return 'unknown'
} else {
return 'other'
}
} else if (myCount !== undefined && proxyCount !== undefined) {
if (proxyCount >= 1000000000000000000) {
return 'proxy'
} else if (myCount >= 1000000000000000000) {
return 'account'
} else {
return 'other'
}
}
return 'unknown'
}
/**
* Sign messages using web3 personal signatures
* @param web3 Web3 instance
* @param message message to sign
* @param signerAddress web3 address signing the message
*/
export async function personalSignAsync(web3: Web3, message: string, signerAddress: string
): Promise<ECSignature> {
const signature = await promisify<Web3.JSONRPCResponsePayload>(c => web3.currentProvider.sendAsync({
method: 'personal_sign', // 'eth_signTypedData',
params: [message, signerAddress],
from: signerAddress,
} as any, c)
)
return parseSignatureHex(signature.result)
}
/**
* Special fixes for making BigNumbers using web3 results
* @param arg An arg or the result of a web3 call to turn into a BigNumber
*/
export function makeBigNumber(arg: number | string | BigNumber): BigNumber {
// Zero sometimes returned as 0x from contracts
if (arg === '0x') {
arg = 0
}
// fix "new BigNumber() number type has more than 15 significant digits"
arg = arg.toString()
return new BigNumber(arg)
}
/**
* Send a transaction to the blockchain and optionally confirm it
* @param web3 Web3 instance
* @param param0 __namedParameters
* @param from address sending transaction
* @param to destination contract address
* @param data data to send to contract
* @param gasPrice gas price to use. If unspecified, uses web3 default (mean gas price)
* @param value value in ETH to send with data. Defaults to 0
* @param onError callback when user denies transaction
*/
export async function sendRawTransaction(
web3: Web3,
{from, to, data, gasPrice, value = 0, gas}: Web3.TxData,
onError: (error: Error) => void
): Promise<string> {
if (gas == null) {
// This gas cannot be increased due to an ethjs error
gas = await estimateGas(web3, { from, to, data, value })
}
try {
const txHashRes = await promisify(c => web3.eth.sendTransaction({
from,
to,
value,
data,
gas,
gasPrice
}, c))
const txHash = txHashRes.toString()
return txHash
} catch (error) {
onError(error)
throw error
}
}
/**
* Estimate Gas usage for a transaction
* @param web3 Web3 instance
* @param fromAddress address sending transaction
* @param toAddress destination contract address
* @param data data to send to contract
* @param value value in ETH to send with data
*/
export async function estimateGas(
web3: Web3,
{from, to, data, value = 0 }: Web3.TxData
): Promise<number> {
const amount = await promisify<number>(c => web3.eth.estimateGas({
from,
to,
value,
data,
}, c))
return amount
}
/**
* Get mean gas price for sending a txn, in wei
* @param web3 Web3 instance
*/
export async function getCurrentGasPrice(web3: Web3): Promise<BigNumber> {
const meanGas = await promisify<BigNumber>(c => web3.eth.getGasPrice(c))
return meanGas
}
// sourced from 0x.js:
// https://github.com/ProjectWyvern/wyvern-js/blob/39999cb93ce5d80ea90b4382182d1bd4339a9c6c/src/utils/signature_utils.ts
function parseSignatureHex(signature: string): ECSignature {
// HACK: There is no consensus on whether the signatureHex string should be formatted as
// v + r + s OR r + s + v, and different clients (even different versions of the same client)
// return the signature params in different orders. In order to support all client implementations,
// we parse the signature in both ways, and evaluate if either one is a valid signature.
const validVParamValues = [27, 28]
const ecSignatureRSV = _parseSignatureHexAsRSV(signature)
if (_.includes(validVParamValues, ecSignatureRSV.v)) {
return ecSignatureRSV
}
// For older clients
const ecSignatureVRS = _parseSignatureHexAsVRS(signature)
if (_.includes(validVParamValues, ecSignatureVRS.v)) {
return ecSignatureVRS
}
throw new Error('Invalid signature')
function _parseSignatureHexAsVRS(signatureHex: string) {
const signatureBuffer: any = ethUtil.toBuffer(signatureHex)
let v = signatureBuffer[0]
if (v < 27) {
v += 27
}
const r = signatureBuffer.slice(1, 33)
const s = signatureBuffer.slice(33, 65)
const ecSignature = {
v,
r: ethUtil.bufferToHex(r),
s: ethUtil.bufferToHex(s),
}
return ecSignature
}
function _parseSignatureHexAsRSV(signatureHex: string) {
const { v, r, s } = ethUtil.fromRpcSig(signatureHex)
const ecSignature = {
v,
r: ethUtil.bufferToHex(r),
s: ethUtil.bufferToHex(s),
}
return ecSignature
}
}
/**
* Estimates the price of an order
* @param order The order to estimate price on
* @param secondsToBacktrack The number of seconds to subtract on current time,
* to fix race conditions
* @param shouldRoundUp Whether to round up fractional wei
*/
export function estimateCurrentPrice(order: Order, secondsToBacktrack = 30, shouldRoundUp = true) {
let { basePrice, listingTime, expirationTime, extra } = order
const { side } = order
const now = new BigNumber(Date.now() / 1000).minus(secondsToBacktrack)
basePrice = new BigNumber(basePrice)
listingTime = new BigNumber(listingTime)
expirationTime = new BigNumber(expirationTime)
extra = new BigNumber(extra)
let exactPrice = basePrice
if (order.saleKind == SaleKind.FixedPrice) {
// Do nothing, price is correct
} else if (order.saleKind == SaleKind.DutchAuction) {
const diff = extra.times(now.minus(listingTime))
.dividedBy(expirationTime.minus(listingTime))
exactPrice = side == OrderSide.Sell
/* Sell-side - start price: basePrice. End price: basePrice - extra. */
? basePrice.minus(diff)
/* Buy-side - start price: basePrice. End price: basePrice + extra. */
: basePrice.plus(diff)
}
return shouldRoundUp ? exactPrice.ceil() : exactPrice
}
/**
* Get the Wyvern representation of an asset
* @param schema The WyvernSchema needed to access this asset
* @param tokenId The token's id
* @param tokenAddress The address of the token's contract
*/
export function getWyvernAsset(
schema: any, tokenId: string, tokenAddress: string
): WyvernAsset {
return schema.assetFromFields({
'ID': tokenId.toString(),
'Address': tokenAddress,
})
}
/**
* Get the non-prefixed hash for the order
* (Fixes a Wyvern typescript issue and casing issue)
* @param order order to hash
*/
export function getOrderHash(order: UnhashedOrder) {
const orderWithStringTypes = {
...order,
maker: order.maker.toLowerCase(),
taker: order.taker.toLowerCase(),
feeRecipient: order.feeRecipient.toLowerCase(),
side: order.side.toString(),
saleKind: order.saleKind.toString(),
howToCall: order.howToCall.toString(),
feeMethod: order.feeMethod.toString()
}
return WyvernProtocol.getOrderHashHex(orderWithStringTypes as any)
}
/**
* Assign an order and a new matching order to their buy/sell sides
* @param order Original order
* @param matchingOrder The result of _makeMatchingOrder
*/
export function assignOrdersToSides(order: Order, matchingOrder: UnsignedOrder ): { buy: Order; sell: Order } {
const isSellOrder = order.side == OrderSide.Sell
let buy: Order
let sell: Order
if (!isSellOrder) {
buy = order
sell = {
...matchingOrder,
v: buy.v,
r: buy.r,
s: buy.s
}
} else {
sell = order
buy = {
...matchingOrder,
v: sell.v,
r: sell.r,
s: sell.s
}
}
return { buy, sell }
}
// BROKEN
// TODO fix this calldata for buy orders
async function canSettleOrder(client: OpenSeaPort, order: Order, matchingOrder: Order): Promise<boolean> {
// HACK that doesn't always work
// to change null address to 0x1111111... for replacing calldata
const calldata = order.calldata.slice(0, 98) + "1111111111111111111111111111111111111111" + order.calldata.slice(138)
const seller = order.side == OrderSide.Buy ? matchingOrder.maker : order.maker
const proxy = await client._getProxy(seller)
if (!proxy) {
console.warn(`No proxy found for seller ${seller}`)
return false
}
const contract = (client.web3.eth.contract([proxyABI])).at(proxy)
return promisify<boolean>(c =>
contract.proxy.call(
order.target,
order.howToCall,
calldata,
{from: seller},
c)
)
}
/**
* Delay using setTimeout
* @param ms milliseconds to wait
*/
export async function delay(ms: number) {
return new Promise(res => setTimeout(res, ms))
}
/**
* Encode the atomicized transfer of many assets
* @param schema Wyvern Schema for the assets
* @param assets List of assets to transfer
* @param from Current address owning the assets
* @param to Destination address
* @param atomicizer Wyvern Atomicizer instance
*/
export function encodeAtomicizedTransfer(schema: any, assets: WyvernAsset[], from: string, to: string, atomicizer: WyvernAtomicizerContract) {
const transactions = assets.map((asset: any) => {
const transfer = schema.functions.transferFrom(asset)
const calldata = encodeTransferCall(transfer, from, to)
return {
calldata,
address: transfer.target,
value: new BigNumber(0),
}
})
const atomicizedCalldata = atomicizer.atomicize.getABIEncodedTransactionData(
transactions.map((t: any) => t.address),
transactions.map((t: any) => t.value),
transactions.map((t: any) => new BigNumber((t.calldata.length - 2) / 2)), // subtract 2 for '0x', divide by 2 for hex
transactions.map((t: any) => t.calldata).reduce((x: string, current: string) => x + current.slice(2), '0x'), // cut off the '0x'
)
return {
calldata: atomicizedCalldata,
}
}
/**
* Encode a transfer call for a Wyvern schema function
* @param transferAbi Annotated Wyvern ABI
* @param from From address
* @param to To address
*/
export function encodeTransferCall(transferAbi: AnnotatedFunctionABI, from: string, to: string) {
const parameters = transferAbi.inputs.map(input => {
switch (input.kind) {
case FunctionInputKind.Asset:
return input.value
case FunctionInputKind.Replaceable:
return to
case FunctionInputKind.Owner:
return from
}
})
return WyvernSchemas.encodeCall(transferAbi, parameters)
}
/**
* Encode a call to a user's proxy contract
* @param address The address for the proxy to call
* @param howToCall How to call the addres
* @param calldata The data to use in the call
* @param shouldAssert Whether to assert success in the proxy call
*/
export function encodeProxyCall(address: string, howToCall: HowToCall, calldata: string, shouldAssert = true) {
const abi = shouldAssert ? proxyAssertABI : proxyABI
return WyvernSchemas.encodeCall(abi, [address, howToCall, Buffer.from(calldata.slice(2), 'hex')])
}
/**
* Validates that an address exists, isn't null, and is properly
* formatted for Wyvern and OpenSea
* @param address input address
*/
export function validateAndFormatWalletAddress(web3: Web3, address: string): string {
if (!address) {
throw new Error('No wallet address found')
}
if (!web3.isAddress(address)) {
throw new Error('Invalid wallet address')
}
if (address == NULL_ADDRESS) {
throw new Error('Wallet cannot be the null address')
}
return address.toLowerCase()
}