A user opens their cryptocurrency portfolio and finds dozens of unknown tokens or NFTs they did not purchase. These are often the result of a dust attack or spam campaign—a common but misunderstood threat that can degrade portfolio visibility, increase cognitive load during transaction approvals, and in some cases expose users to social engineering. The tokens themselves are typically worthless and created by attackers to either scam users into visiting phishing websites or to track wallet activity across the blockchain. Understanding how these assets arrive, why they matter, and how to remove them is essential for anyone managing a portfolio across multiple chains.

Rabby Wallet, as a cryptocurrency wallet extension, has become a practical tool for managing digital assets across Ethereum, BSC, Polygon, Arbitrum, Optimism, and other networks. Its ability to connect to hardware wallets, mobile applications, and institutional signers means that users often consolidate portfolio monitoring in one interface. That consolidation also concentrates the problem: a single wallet address can receive spam across multiple networks, and Rabby’s interface may display all of them unless the user takes deliberate action to filter or remove them. This article explains how dust attacks and spam tokens work, describes Rabby’s built-in filtering mechanisms, and outlines manual strategies to reclaim a clean portfolio view.

How dust attacks and spam tokens arrive in a Rabby wallet

A dust attack begins with an attacker identifying a publicly visible wallet address—often derived from on-chain activity, published repositories, or social media. The attacker then deploys a token contract and sends one or more instances to thousands of addresses in rapid succession. The cost is minimal because a token contract can be created for a few dollars, and bulk transfers to multiple addresses can be batched into a single transaction. The resulting spam reaches addresses that never interacted with the attacker.

The attacker’s goal is typically one of three outcomes. First, creating confusion or clutter that makes it harder for the wallet owner to identify legitimate assets and approve transactions accurately. Second, using the spam token’s name, description, or linked website to redirect users toward phishing sites that harvest seed phrases or private keys. Third, establishing a record of the wallet address on the blockchain as the recipient of the spam token, which can aid in transaction tracking, correlation with other wallets, or targeted future attacks. Some spam campaigns are merely noisy but harmless; others are intentionally designed to manipulate or deceive.

NFT spam follows a similar playbook. An attacker creates a low-cost NFT collection and transfers instances to addresses en masse. Because NFTs are individually tracked on the blockchain, each transfer creates an on-chain record. The NFT itself may link to a Discord server, Twitter account, or website that claims the recipient has won a reward or is eligible for an airdrop—a social engineering tactic designed to draw users into an environment where attackers can compromise accounts or request approval to access funds.

The reason spam reaches addresses that did nothing to earn it is that Ethereum and other blockchains allow anyone to send tokens to any address without the recipient’s consent. There is no “recipient approval” step when a token is transferred. The wallet owner discovers the spam only when they open their portfolio interface, at which point the spam tokens are already present on the blockchain. Removing them from the interface is possible; removing them from the blockchain is not—once a token transfer is recorded, it is immutable.

Why spam in a cryptocurrency wallet extension creates decision risk

The immediate inconvenience is visual clutter. A portfolio with dozens of unknown tokens and NFTs makes it harder to locate legitimate assets, track actual value, and understand the current balance at a glance. That inconvenience is not purely aesthetic. When a user is signing a transaction that requires token approval, they may need to select which token to spend from a long dropdown list. A cluttered interface with spam tokens mixed in increases the cognitive load and the likelihood of selecting the wrong asset. A user intending to approve 100 USDC but accidentally approving a spam token is a minor mistake; a user accidentally approving a spam token with an unlimited spend allowance instead of their intended asset is a material loss of security.

The second risk is phishing. If a spam token’s name, symbol, or description closely mimics a legitimate asset—such as USDT, USDC, or a popular DeFi protocol token—a user might be tricked into interacting with it. The token itself may link to a website when clicked, and that website can be designed to harvest wallet credentials or request permission to drain funds. A user who receives spam with a name like “UUUSDT” or “USD-T” may briefly mistake it for USDT, especially if they are reviewing approvals quickly or on a small mobile screen.

The third risk is tracking and correlation. Receiving a spam token creates a permanent on-chain record that the wallet participated in a particular transaction. This can be used by transaction analysts to strengthen wallet clustering, correlate multiple addresses believed to belong to the same entity, or identify patterns in wallet behavior. The spam token itself does not grant access to the wallet; the record of receiving it is purely informational. But that information can be valuable to adversaries, law enforcement, or analytics firms building a profile of the address.

How Rabby Wallet filters and hides spam tokens by default

The most straightforward defense is for the wallet interface itself to recognize and hide known spam tokens automatically. Rabby Wallet includes built-in filtering that suppresses display of tokens flagged as spam or low-quality assets. When a user opens their portfolio in Rabby, the spam tokens and suspicious NFTs are typically not shown by default, keeping the interface clean and the visible balance accurate. This filtering is powered by community reports, contract analysis, and integration with services that maintain blacklists of known spam and scam tokens.

The filtering mechanism works because the wallet checks each token contract against a database of known spam patterns. A token might be flagged if it has been reported by multiple users, has suspicious contract code, or shares characteristics with known scam patterns. Token approvals are tracked separately, so a user can see which assets they have approved for spending even if those assets are hidden from the main portfolio view. This two-tier approach keeps the portfolio clean while preserving awareness of approval permissions that might pose a lingering security risk.

For NFTs, Rabby similarly identifies and suppresses collections flagged as spam or suspicious. The criteria are looser because legitimate NFTs are harder to distinguish from spam at the contract level alone; instead, Rabby relies on integration with NFT collection data providers and community feedback. Users can toggle the display of hidden NFTs if they want to see what was suppressed, useful for confirming that a particular item was correctly identified as spam.

The limitation of automatic filtering is that it depends on timely identification. A newly deployed spam token or NFT collection may not be in the database for hours or days, and during that window, it will appear in the portfolio. Additionally, filtering criteria evolve; a token flagged as spam may eventually be delisted if it matures into a legitimate project, or conversely, a token that appears legitimate might later be classified as spam. Users should not rely entirely on automatic filtering as a complete defense, particularly for addresses that have high value or hold rare assets that might attract targeted attacks.

Manual strategies for identifying and removing spam from a Rabby portfolio

When automatic filtering is not sufficient or a user wants to verify the legitimacy of assets manually, several techniques can identify spam. First, check the contract address on a blockchain explorer such as Etherscan or the relevant chain-specific explorer. A spam token’s contract often has zero or near-zero liquidity, no recent transactions, or no associated trading pair on major decentralized exchanges. Legitimate tokens typically show active trading volume, holder counts, and a recognizable project website linked in the contract metadata.

Second, examine the token’s holder distribution. Spam tokens often have thousands or millions of holders because they were airdropped in bulk. Legitimate tokens held by end users typically have far fewer holders in proportion to their supply. A token with one million holders and one billion supply distributed evenly across wallets is a classic spam signature. A quick scan of the top holders on Etherscan can reveal whether the token is concentrated among a small set of addresses (often a sign of a real distribution) or uniformly spread (often a sign of an airdrop or spam campaign).

Third, search for the token’s name or contract address on Twitter, Discord, or project websites to assess whether it is associated with a known project. Legitimate tokens have communities, documentation, and a coherent social presence. Spam tokens often have none of these or only a hastily created website with broken links. Be cautious of projects that aggressively promote airdrops or offer rewards for clicking links; these are common spam tactics.

Fourth, avoid interacting with the token’s link or contract until you have verified it is legitimate. Do not click on links embedded in the token’s description or listed on explorer pages without confirming the URL independently. Do not approve the token for any spending until you understand what it is and why you received it. If you cannot find any legitimate reason for the token to exist, it is spam and can be safely ignored from that point forward.

For removal, the reality is that spam tokens cannot be deleted from the blockchain itself—the transfer record is permanent. However, Rabby Wallet allows users to manually hide specific tokens from their portfolio view. Users can access the token settings, often within the portfolio or asset list section, and mark individual tokens as “spam” or “hidden.” This action only affects the display in Rabby; the tokens remain on the blockchain and the underlying smart contract records are unchanged. Some users manually hide any unknown or unverified tokens received without their request.

Token approvals and why spam tokens are often used in approval scams

A token approval is a separate blockchain transaction that grants a smart contract permission to transfer a specified amount of your token on your behalf. When you interact with a decentralized exchange, lending protocol, or other DeFi application, you typically must first approve the protocol to spend a certain amount of your token. This separation of approval and transaction is fundamental to how Ethereum and similar blockchains work, but it creates an opportunity for confusion.

A spam token might be designed with a malicious approval mechanism, or the attacker might entice a user to approve a spam token by claiming it is a legitimate airdrop reward. Once approved, a malicious smart contract can transfer the token to the attacker’s address without additional user interaction. More dangerously, some approval scams use tokens that mimic legitimate assets and convince users to approve them with unlimited allowances, thinking they are approving the real asset. A user who approves an unlimited allowance for a fake “USDC” token has granted the attacker’s contract the ability to transfer as much of that fake token as exists in their wallet.

Rabby Wallet displays pending approvals and allows users to revoke them through the transaction interface. When you encounter a spam token, you can check whether you have granted it any approvals by examining the approval history. If a spam token has an approval you did not authorize, you can issue a revocation transaction to set the allowance back to zero. This costs a small gas fee but prevents future unauthorized transfers. Do not attempt to revoke approvals by sending the spam token to a burn address or using experimental contract interactions; use the standard approval revocation mechanism built into the wallet interface.

Practical setup for using Rabby Wallet safely against dust attacks

To begin, users can download and install Rabby Wallet through the official browser extension repositories for Chrome, Firefox, or Edge. Before importing any existing wallet or creating a new one, enable security features such as two-factor authentication if offered, use a strong master password, and store your recovery phrase offline. A rabby wallet download from the official source is the first control; an official download ensures that the interface you see matches the intended design and that no malicious code has been inserted during distribution.

Once your wallet is set up and you have added addresses, configure Rabby’s filtering settings to hide spam and low-risk tokens by default. Review your portfolio regularly, particularly if you hold addresses on public blockchains where spam is common. Keep an eye on your approvals; Rabby can display a dashboard of all active token approvals across your added addresses and chains. Quarterly or after receiving unexpected tokens, scan this list and revoke any approvals you do not recognize.

For addresses with significant value or rare NFTs, consider restricting public visibility. Do not advertise your address on social media or share it unnecessarily; narrow exposure reduces the likelihood of being targeted by spam campaigns. If you use the same address for yield farming, token swaps, or other on-chain interactions, you are more likely to receive spam because the address is visible in transaction histories. This is normal and unavoidable; the filtering and manual cleanup steps above are the practical mitigation.

For users who manage multiple wallets or who want to monitor addresses without controlling them, Rabby’s watch-only address functionality is useful. You can add any address to Rabby without importing its private key, allowing you to see balances and transaction history without the ability to spend. Spam received by watched addresses is still visible in the raw list, but it is intellectually easier to ignore because the address is not one you actively use. This separation can reduce decision fatigue when you are reviewing holdings across many addresses.

The broader context: why spam is hard to eliminate

Dust attacks and spam tokens persist because they are fundamentally difficult to prevent at the protocol level. Ethereum and other blockchains are designed to allow anyone to send transactions to any address without permission; this is part of their openness and censorship resistance. Adding a mechanism to reject unwanted transfers would require either permission systems or filtering at the consensus layer, both of which would contradict the core design. Spam is therefore a persistent feature of public blockchains, not a bug that will be “fixed.”

The practical defense is layered: wallet interfaces can filter and hide spam, users can manually identify and verify assets, and community-driven blacklists can keep pace with new spam campaigns. No single mechanism stops spam entirely, but their combination makes spam an annoyance rather than a serious security threat for most users. The key is treating spam as a normal part of on-chain activity and developing habits to manage it—regular portfolio reviews, verification of unknown assets, and periodic approval audits.

For users who have concerns about a particular address being targeted, the only truly reliable mitigation is to use a fresh address for new interactions. If a given address has received significant spam, it is permanently identified on the blockchain as a target. Moving to a new address for future activities can reduce future spam, though past spam will remain in the blockchain record. Alternatively, accepting that some portfolio viewing includes hidden spam and focusing on legitimate assets is often the most practical approach for addresses that have been in use for years.