Hacked by Trenggalek6etar

Ethereum’s transaction costs have become a practical problem for millions of users. During periods of network congestion, a single token swap or NFT purchase can cost $50, $100, or more in gas fees alone. Layer 2 scaling solutions—including Arbitrum, Optimism, and zkSync—reduce those costs to cents or fractions of a cent by processing transactions off the main Ethereum chain while maintaining security guarantees. The technical foundation is sound, but the operational challenge remains: moving assets between networks, choosing the right Layer 2 for a given task, and understanding which wallet software actually supports all the chains you need.

Rabby Wallet, developed by the DeBank team, addresses this problem by offering native support for Ethereum and over 90 EVM-compatible chains, including the most widely used Layer 2 networks. As a free, open-source, self-custody wallet available on desktop browsers and mobile platforms, Rabby combines essential features such as transaction simulation with risk alerts, gas optimization, hardware wallet integration, and token approval management. For users operating across multiple chains and seeking to minimize transaction costs without sacrificing security, understanding how Rabby’s chain support works in practice is essential to making informed decisions about which network to use and how to route transactions efficiently.

Layer 2 networks: why they exist and how they reduce gas fees

Ethereum’s base layer processes approximately 12 to 14 transactions per second at maximum capacity. During high demand periods, this limitation causes a backlog, which in turn drives up gas prices as users bid against one another for block space. Layer 2 solutions operate differently: they bundle multiple transactions into batches, process them off-chain using either optimistic rollups or zero-knowledge proofs, and then post a cryptographic proof or claim back to Ethereum. This approach increases throughput dramatically—often to hundreds or thousands of transactions per second—while maintaining the security guarantees of Ethereum’s consensus layer.

Arbitrum and Optimism are optimistic rollups, meaning they assume transactions are valid by default and only require cryptographic proof if someone challenges the result. This design minimizes the computational overhead during normal operation, allowing lower fees and faster finality for practical purposes. zkSync, StarkNet, and Polygon zkEVM use zero-knowledge proofs, which provide cryptographic certainty of validity without requiring a challenge period, but the proof generation itself can be computationally expensive. The trade-off is technical: zero-knowledge rollups offer stronger security properties at the cost of higher infrastructure complexity, while optimistic rollups prioritize simplicity and lower costs during normal operation.

For an end user, the practical difference is often simpler than the underlying mechanics. Arbitrum and Optimism offer gas fees that are typically 10 to 100 times lower than Ethereum’s base layer, depending on network congestion and transaction complexity. zkSync fees are similarly low. The speed of finality—how long before a transaction is irreversible—varies: optimistic rollups have a challenge period that can last a week for full security, though most transactions are considered practically final within minutes. Zero-knowledge rollups settle faster because the proof itself is the finality event.

Moving assets between Ethereum and Layer 2s requires a bridge transaction, which involves sending funds to a contract on one chain and receiving them on another. rabby wallet integrates bridge support and multi-chain asset visibility, so users can see their token balances across different networks and execute swaps or transfers without leaving the application. However, bridges themselves introduce operational steps: they require waiting for confirmations, confirming the destination chain, and understanding which bridge service or protocol is being used. The wallet simplifies this, but it does not eliminate the need to choose correctly and verify the destination before signing.

How Rabby supports Ethereum and 90+ EVM chains

Rabby’s chain support is organized around a simple principle: if a network is Ethereum-compatible—meaning it uses the Ethereum Virtual Machine (EVM) standard and supports Ethereum-compatible wallets—Rabby can operate on it. This includes not only Layer 2 rollups but also alternative Layer 1 blockchains such as Polygon, Avalanche, Fantom, and dozens of others. The wallet can be configured to show balances and execute transactions on any of these networks without requiring separate application installations.

From a technical standpoint, EVM compatibility means the network accepts the same account addresses and cryptographic signatures as Ethereum. The Ethereum Foundation’s technical documentation describes the account model, which uses the same key derivation and signing scheme across all compatible chains. This uniformity is what makes Rabby’s multi-chain architecture practical: one recovery phrase, one set of private keys, one Ethereum-format address can hold assets on Ethereum mainnet, Arbitrum, Optimism, zkSync, Polygon, and other networks simultaneously. The wallet’s role is to let the user switch between networks and display which assets exist on each.

The practical implication is that Rabby’s support for 90+ chains does not require 90+ different wallet implementations. Instead, the wallet maintains a list of compatible networks, their RPC endpoints (servers that provide blockchain data), and their chain identifiers. When a user selects a network, the wallet connects to that network’s infrastructure, signs transactions according to the EVM standard, and submits them to that network’s validators. The user’s seed phrase and private keys remain under their control; Rabby never manages them on behalf of the user.

Hardware wallet integration amplifies this flexibility. Ledger, Trezor, Keystone, OneKey, GridPlus, and BitBox02 devices can all sign transactions through Rabby across any supported chain. This means a user can operate on Arbitrum, Optimism, or zkSync while keeping their private keys on a hardware device that never connects directly to the internet. The hardware wallet remains the source of truth; Rabby is simply the interface for proposing transactions.

Understanding gas fees on Layer 2s and optimizing with Rabby

Gas fees on Layer 2 networks are not zero, but they are structured differently from Ethereum’s base layer. On Ethereum, gas cost reflects the computational resources required to execute a transaction: storage writes, cryptographic operations, and contract state changes. On optimistic rollups like Arbitrum and Optimism, the fee includes a small base cost for the transaction plus a cost for the data that must be posted to Ethereum for proof purposes. This second component, sometimes called “calldata cost,” is what makes Layer 2 fees so much lower: most transactions require only a few bytes of data on Ethereum, even though they represent complex state changes on Layer 2.

Rabby’s gas estimation tools account for these differences. When a user initiates a transaction on Layer 2, the wallet queries the network’s gas price and calculates the expected fee. For token transfers, simple swaps, or contract interactions, Layer 2 fees are typically between $0.01 and $1.00, compared to $10 to $100+ on Ethereum during congestion. However, the fee is not fixed: it depends on Layer 2 network congestion, the complexity of the transaction (storing data costs more than reading), and the gas price set by the Layer 2’s sequencer, which batches transactions for posting to Ethereum.

Rabby also offers a Gas Account feature, which allows users to pay transaction fees using stablecoin balances (USDC or USDT) rather than native network tokens (ETH for Ethereum). This is particularly useful on Layer 2s where native token acquisition can involve an extra bridging step. If a user has stablecoins but no ETH on Arbitrum, Rabby’s Gas Account can convert a small amount of stablecoin to cover the transaction fee, simplifying the user experience. The swap fee for this conversion is incorporated into the transaction cost calculation.

For users comparing costs across networks, the calculation should always be complete. A Layer 2 transaction might cost $0.05 in gas, but if it requires bridging assets onto the Layer 2 first, the bridge cost (which occurs on Ethereum and is therefore expensive) must be included in the total. Rabby displays transaction costs before signing, which helps users make informed decisions, but the wallet cannot eliminate the reality that moving onto a Layer 2 has an initial cost. That cost is usually justified only if the user intends to execute multiple transactions on that Layer 2, amortizing the bridge fee across several operations.

Transaction simulation and risk alerts: before you sign

One of Rabby’s distinctive features is transaction simulation, which executes a transaction in a test environment and predicts the outcome before asking the user to sign. This is valuable across any chain, but it becomes especially important when operating on multiple networks, where mistakes can be costly. A user might accidentally send funds to a wrong contract address, approve an excessive token allowance, or interact with a malicious smart contract. Simulation surfaces these risks by showing what will happen if the transaction is approved.

Simulation works by taking the pending transaction—including recipient address, amount, function call parameters, and contract code—and running it against the current network state without actually modifying anything. The simulation returns the expected result: will the transaction succeed or fail? Will tokens be transferred as expected, or will the contract do something different? Will the user receive the asset they think they are buying, or will the swap route produce a different result? This is particularly important for decentralized exchange transactions, which can be vulnerable to front-running or slippage that simulation can partially reveal.

Risk alerts complement simulation by flagging common attack patterns. If a transaction is trying to interact with a contract that is not verified on the network’s blockchain explorer, or if the transaction is attempting to approve a token to an address that is not a recognized DEX or protocol, Rabby highlights the risk. These alerts are not foolproof—a sophisticated attacker can still create convincing-looking transactions—but they catch many common phishing and scam patterns. A user should treat alerts as warnings to pause and verify, not as absolute security guarantees.

The simulation process requires connecting to the network and retrieving current state, which is why Rabby uses RPC endpoints—servers that provide blockchain data to the wallet. The wallet can be configured to use public RPC endpoints, private services, or the user’s own Ethereum node. Using a trusted RPC provider matters because that endpoint has visibility into transaction details. A privacy-conscious user might run a personal node or use a privacy-focused RPC service; most users will accept the convenience of a public or semi-public RPC with the understanding that connection metadata could be observed.

Token approvals, revocation, and the approval decoder

When a user interacts with a decentralized exchange, lending protocol, or other smart contract application, they often grant the contract permission to spend tokens on their behalf. This approval is necessary because the user cannot sign every individual transaction that the protocol needs to execute. However, approvals can be dangerous: if a contract is exploited or malicious, it might drain the user’s entire approved balance. Over time, a user who has interacted with many protocols can accumulate dozens of active approvals, each one representing a potential attack vector.

Rabby’s approvals manager displays all active token approvals across all connected networks and allows the user to revoke any of them. This is not a unique feature—other wallets offer similar tools—but the ability to revoke approvals across 90+ chains from a single interface reduces friction. A user can audit their exposure without manually checking each network or using multiple wallet applications. Revoking an approval is a simple transaction that costs a small amount of gas but returns the contract’s permission to zero, blocking any further spending.

The approval decoder is a complementary tool that displays the function calls within a transaction in human-readable language. Instead of seeing hexadecimal contract code, a user sees “Approve USDC spending” or “Swap 10 USDC for ETH.” This clarity helps prevent accidents where a user misunderstands what they are signing. A common scam involves tricking a user into approving an unlimited token allowance to a malicious address; the approval decoder makes the transaction’s intent visible, though a user must still read and understand it.

The practical security model is that approvals are a user responsibility. The wallet can show risks and decode transactions, but the user must ultimately decide whether the transaction is legitimate. Phishing remains effective because attackers can create convincing-looking interfaces that ask for approvals to innocent-sounding contracts. Rabby’s tools improve visibility, but they do not replace judgment or the user’s own verification of the site they are visiting.

Security considerations: open source, audits, and hardware integration

Rabby is open source, which means its code is publicly available for review. GitHub repositories contain the wallet’s source, allowing security researchers, developers, and users to inspect the implementation and identify potential vulnerabilities. Open source does not guarantee security—code can still have bugs or vulnerabilities—but it enables community review and reduces the risk of hidden backdoors. Rabby has undergone professional security audits, and the results have been publicly disclosed, providing additional assurance.

The distinction between open source and proprietary is important for custody wallets. A closed-source wallet might be secure, but users cannot independently verify the claims. With open source, users can compile the wallet from source code themselves, ensuring they are running exactly what they expect. This is most practical for browser extensions, where technical users can verify the source before installation. Mobile apps are somewhat more complex because the app distribution channels (Apple App Store, Google Play) have their own verification processes, though the underlying code is still reviewable.

Hardware wallet support is a critical security feature. When Rabby integrates with Ledger, Trezor, or other hardware devices, it delegates the actual signing of transactions to the hardware device. The user’s private key never leaves the hardware; Rabby only constructs the transaction and sends it to the device for signing. This architecture means that even if a user’s computer is compromised by malware, the attacker cannot forge transactions because they do not have access to the signing key. The hardware device can also display transaction details on its own screen, giving the user a chance to verify what they are signing on a device they control.

Wikipedia’s overview of cryptocurrency wallets distinguishes between custodial and non-custodial designs: Rabby is non-custodial, meaning the user controls their private keys and Rabby has no authority to access or move funds. This is a fundamental security model that users should verify for any wallet they use. Custodial wallets, by contrast, are held by a third party (like an exchange), which simplifies recovery but introduces custody risk.

Avoiding scams: fake Rabby sites and malicious extensions

Fake Rabby wallets and malicious extensions are widespread. Scammers register domains that closely resemble the real Rabby site, create Chrome extensions with names similar to the legitimate wallet, and distribute phishing links through social media. A user who installs a fake Rabby Wallet extension will see a convincing interface that asks them to enter their recovery phrase, at which point the attacker gains full control of their assets. This is not a flaw in Rabby’s design; it is a consequence of the fact that any attacker can create an app that mimics the real one.

The legitimate Rabby Wallet can be downloaded from the official Rabby website, which is hosted at rabby.io. Users should verify the domain carefully before installing any extension or downloading any app. Checking the official website for links to the app store or browser extension marketplace reduces the risk of phishing. Once installed, users should verify that the extension’s icon and name match the official version. Browser extensions request permissions during installation; legitimate Rabby only requests permissions necessary for wallet functionality, not email access, browser history, or other sensitive data.

For mobile apps, downloading from the official Apple App Store or Google Play Store provides some protection because these platforms verify applications, though scams do occasionally slip through. Users should check the publisher name (listed as “DeBank”), read recent reviews, and verify the app version. The official Rabby mobile app has millions of downloads and consistent positive reviews; a recently created app with the same name but different publisher is likely a scam. If in doubt, the safest approach is to use only the browser extension on a desktop computer until comfortable with the platform.

Practical workflow: moving assets between Layer 2s and optimizing costs

A concrete scenario illustrates how Rabby’s multi-chain support reduces friction and costs. A user holds USDC on Ethereum and wants to trade it for an altcoin token available on Arbitrum. Without a multi-chain wallet, the steps would be: (1) bridge USDC from Ethereum to Arbitrum, wait for confirmation; (2) swap USDC for the target token on Arbitrum; (3) potentially bridge back to Ethereum or another chain if the user needs different tokens elsewhere. Each step involves separate transactions, fees, and risk of mistakes.

With Rabby, the workflow is simpler: (1) connect to the Ethereum network, confirm you have USDC; (2) initiate a swap or bridge transaction to move USDC to Arbitrum; (3) switch to the Arbitrum network in Rabby; (4) execute the trade on Arbitrum. The wallet displays all balances across networks, so you can see what you have where at any time. If you later want to move funds to Optimism or another Layer 2, you repeat the process. The Gas Account feature can reduce friction if you lack native network tokens for fees.

The cost optimization depends on your transaction volume and the specific routes you choose. A single bridge transaction to Arbitrum might cost $10 to $30 on Ethereum, followed by a $0.10 to $0.50 swap fee on Arbitrum. For a user executing multiple trades, that initial bridge cost is amortized across all trades, making Layer 2s economical. For a user making just one transaction, the bridge cost might outweigh the gas savings. Rabby’s fee estimation helps surface these trade-offs, but the user must do the arithmetic before committing.