Rabby Wallet Extension: Setting Up Watch-Only Accounts for Portfolio Tracking Without Signing Rights

A portfolio manager, institutional custodian, or individual investor often needs to monitor cryptocurrency holdings across multiple wallets—some held in cold storage, others managed by team members, still others representing external positions—without holding the private keys themselves. This monitoring requirement creates a specific challenge: how to track balances, transaction history, and on-chain activity across EVM-compatible networks without exposing seed phrases or compromising the security model of those wallets. Traditional approaches either demand key exposure through secret sharing or rely on centralized tracking services that aggregate all holdings on their own infrastructure.

A self-custodial wallet like Rabby offers a structural solution through watch-only account functionality. The Rabby wallet extension allows users to add addresses without importing private keys, monitor their positions, and simulate transactions before approval—all while maintaining the separation between observation and signing authority. This capability becomes particularly valuable when managing portfolios across Ethereum, Polygon, Arbitrum, Optimism, Base, and other EVM networks, where the Rabby features include automatic network recognition and unified balance reporting. The practical result is that a user can maintain a comprehensive view of on-chain assets while delegating actual fund control to designated key holders.

Understanding watch-only accounts and their security model

Watch-only account functionality inverts the traditional wallet relationship. Rather than storing private keys and using them to sign transactions, a watch-only account holds only an address—the public-facing identifier on the blockchain. This address can receive funds, be queried for balance information, and have its transaction history examined on any blockchain explorer. The wallet software can retrieve this data through public-chain queries without ever needing the private key or being able to approve any transfer.

The security implication is straightforward: a compromised watch-only wallet cannot drain funds from the associated addresses because the wallet software has no ability to sign transactions. An attacker gaining access to a device running a watch-only setup cannot extract private keys, because none exist in that context. The associated addresses continue to be controlled by whoever holds the actual private keys, which remain stored in a separate location or device. This separation creates what cryptographers call a capability boundary—the watch-only software has the capability to observe but not the capability to act.

The Rabby wallet extension implements this model by allowing users to add addresses directly without importing keys. Each added address is treated as a separate entity for viewing purposes. The wallet queries the blockchain through its own or user-selected remote procedure call (RPC) endpoints to retrieve balance, token holdings, and transaction history. Because Rabby is an open-source project, users can verify that the watch-only implementation does not attempt to transmit addresses to external servers or construct hidden signing channels. That transparency is a practical advantage over proprietary tracking solutions.

However, a watch-only account is still only as useful as its backup procedure and the browser or device on which it runs. If the list of watched addresses is not backed up separately, or if it is stored only in the wallet’s local database, then device replacement or a reset could require re-entering all addresses manually. Additionally, while the watch-only account cannot sign transactions, the device itself remains subject to malware, phishing, and credential theft. Protecting a watch-only setup means the same security hygiene as any other software: operating-system updates, browser extension verification, and awareness of what sites are interacting with the wallet.

Adding and organizing addresses across multiple blockchain networks

The Rabby wallet extension can automatically detect and switch between EVM-compatible networks as users navigate different decentralized applications. This network-agnostic approach is valuable for watch-only setups because it means a single address can be queried across Ethereum mainnet, Polygon, Arbitrum, Optimism, Base, and other chains without requiring manual network switching. Many users maintain the same address derivation across multiple chains—a consequence of how wallet generation works—so observing one address on multiple networks is often meaningful.

Adding a watch-only address to the Rabby wallet extension is a three-step process. First, the user creates or switches to the wallet interface and selects “Add Address” or “Watch Account.” Second, they enter the address in hexadecimal format (the standard 0x… notation on Ethereum and EVM networks). Third, they confirm and label the entry—typically with a descriptor such as “Cold Storage Vault” or “Team Multisig” to maintain organizational clarity. Unlike private-key imports, which require extended validation and sometimes passphrase entry, adding a watch-only address completes immediately because there is no cryptographic material to process.

The wallet then queries the address across the user’s selected networks, retrieving current balance, token holdings, and recent transaction history. For users managing multiple addresses, the rabby wallet extension consolidates all watched addresses into a single portfolio view, showing aggregate balances in a single currency or by individual asset. This consolidation is particularly useful for institutional setups where one team member may be responsible for monitoring dozens of addresses spread across operational, reserve, and emergency-access wallets.

Organization systems matter more than they initially appear. If addresses are not labeled clearly or tracked in a separate list, a user monitoring five cold-storage addresses and eight institutional multisigs may accidentally send funds to the wrong destination during a transaction. A practical workflow is to maintain a small external document—stored securely—that cross-references each address with its purpose, the chain on which it holds primary assets, and the time interval at which it is typically reviewed. The blockchain wallet monitoring then becomes a runtime view into that reference system rather than the source of truth.

Transaction simulation and pre-sign risk assessment for watch-only monitoring

While watch-only accounts cannot sign transactions, they can still be valuable for transaction review and education. Many Rabby features include transaction simulation, which interprets pending transactions before they are signed and alerts users to unusual patterns or potential risks. This capability applies equally to watching other people’s wallets: if a cold-storage address is preparing to move funds, the portfolio manager or delegated reviewer can simulate that transaction in Rabby to understand what is actually being approved before the authorized signer executes it.

Transaction simulation works by parsing the low-level bytecode and state calls that a transaction would execute on the blockchain, then presenting them in human-readable form. Instead of displaying a cryptic string of function calls, Rabby might show “Send 10 ETH to 0xabcd…, interact with Uniswap router, and deposit into Aave.” For token approvals, a frequently exploited contract interaction, the simulation layer alerts whether an unlimited approval is being granted or a specific amount. This pre-execution visibility is valuable for watch-only setups because it allows a second pair of eyes to confirm intended behavior before signing authority is invoked.

The integration with blockchain wallet standards such as Ethereum’s own standards ensures that Rabby’s transaction interpretation aligns with how the broader ecosystem operates. When a user adds a watch-only address to the wallet and that address is subsequently used in a transaction proposal, Rabby can receive the transaction data through the standard web3 provider interface and analyze it. This means that even if the signer uses a different wallet (such as hardware wallet software or a separate Ledger instance), the watch-only Rabby instance can review the same transaction data and provide feedback to the authorized signer.

For institutional or multi-party setups, this review pattern becomes a lightweight governance layer. A portfolio manager monitoring three cold-storage wallets through watch-only Rabby accounts can receive a transaction proposal from the key holder, simulate it in Rabby, verify the destination and amounts, and then either approve the sequence or flag concerns. The watch-only account does not approve anything on-chain—only the authorized key can sign—but it provides a structured review mechanism that reduces execution errors and improves auditability.

Comparing watch-only accounts to hardware wallets and multisignature setups

Watch-only accounts are not a replacement for hardware wallets or multisig smart contracts, but they serve a complementary role in a complete portfolio architecture. A hardware wallet stores private keys on a specialized device that signs transactions locally and never transmits keys to the internet. A multisignature smart contract requires multiple parties to approve transactions before they execute on-chain. A watch-only account provides observation without any signing capability. Each tool addresses a different operational need.

For a solo investor with a hardware wallet in cold storage, a watch-only setup in Rabby allows daily balance checks without needing to physically access or plug in the hardware device. For an institutional team where ten people need to view balances but only four are authorized to transfer funds, watch-only Rabby instances eliminate the need to circulate private keys or rely on a centralized server that tracks everything. For multisig wallets—where decisions already require multiple signatures—Rabby’s transaction simulation layer can enhance the review process by showing each signer what the proposal will actually do before voting.

The practical difference becomes clear in a scenario where a team maintains a 2-of-3 multisig vault. The three key holders each possess one private key and access to the multisig contract on-chain. If they all need to monitor the vault’s activity, they could each import one copy of their private key into Rabby, but that multiplies the attack surface: each person’s device becomes a potential target. Alternatively, each team member can add the multisig address as watch-only in their Rabby instance. They retain full visibility into the vault’s balance and transaction history, they can simulate proposed transactions before voting, and no private keys leave their secure storage. The cryptocurrency management discipline improves because observation and control are properly separated.

Setting up backup and recovery for watched address lists

A watch-only wallet is only as durable as its address list. Unlike a private-key wallet, where recovery is possible from a single seed phrase, a watch-only list must be backed up independently or reconstructed manually. This creates a specific failure mode: if the device running Rabby fails, is replaced, or the browser is reset, the watched addresses may be lost unless they have been exported or documented elsewhere. For a portfolio manager monitoring thirty addresses, manual re-entry is impractical.

Rabby’s backup approach typically relies on browser storage or manual export functionality. Some wallet extensions offer the ability to export a list of watched addresses in a portable format (such as JSON or CSV). Users should check whether this export feature is available in their version and test the restore process on a secondary device before relying on it in production. A parallel backup system—maintaining a simple text file or spreadsheet listing all watched addresses with their labels and purposes—provides a second recovery path that does not depend on any software feature.

For institutional users, version control systems like GitHub can store encrypted address lists in a repository, allowing distributed backup and rollback capabilities. This approach requires that the file be encrypted before upload (not storing unencrypted address lists in public repositories) and that access permissions are managed strictly. The benefit is that the address list becomes part of the team’s standard infrastructure backup process rather than a peripheral task.

Recovery testing is critical. After setting up a watch-only Rabby wallet extension with a set of addresses and creating a backup, users should periodically verify that they can restore from the backup on a fresh installation. This validation prevents the discovery of backup failure modes during an actual emergency. A recommended cadence is quarterly verification for institutional setups and annual verification for personal portfolios.

Network queries, RPC endpoints, and privacy considerations

When a watch-only account queries the blockchain for balance and transaction history, that query must originate from somewhere. The Rabby wallet extension can use a default set of public RPC endpoints (remote procedure call servers provided by infrastructure services), or users can configure custom endpoints to route through their own nodes or privacy-preserving services. This choice has both privacy and reliability implications.

A default public endpoint from a service like Alchemy or Infura means that those services can observe which addresses are being queried from a particular IP address. If the same IP address consistently queries the same set of addresses, an observer could associate them with a single entity or portfolio. For watch-only setups where the goal is to avoid drawing attention to relationships between addresses, this linkage may be undesirable. Conversely, a user running their own Ethereum node and configuring Rabby to use that node’s RPC means all queries stay internal and no external services are involved.

The practical decision depends on threat model and infrastructure. A personal investor monitoring their own addresses probably faces minimal privacy risk from RPC observation. An institutional custodian monitoring client assets might have stronger incentives to use private infrastructure. Ethereum Improvement Proposals define the standard RPC interface, so any compliant endpoint—whether public or private—should provide consistent results. The Rabby wallet extension supports configuration of custom RPC endpoints, allowing users to direct all queries to their preferred source.

Practical workflows for portfolio managers and custody reviewers

A common workflow for institutional custody involves a chain of responsibility. The custodian bank or multisig participants hold private keys. The portfolio manager or compliance officer needs visibility into all holdings. These two roles should not depend on the same key. Setting up Rabby watch-only accounts allows the portfolio manager to maintain that separation.

Day-to-day operation would look like this: the portfolio manager opens Rabby on their work device each morning, sees updated balances across all watched addresses, and notes any significant changes. If an address has made a transfer, Rabby shows the transaction details, the receiving address, and the amount. If a transfer is pending approval, the portfolio manager can request the transaction proposal from the key holder, import it into a simulation session in Rabby, verify the logic, and signal approval or escalate concerns. This pattern keeps the portfolio manager informed without requiring them to hold signing keys.

For individuals managing multiple addresses, the workflow is similarly straightforward but more self-directed. An investor with one hardware wallet, one paper backup cold-storage address, and several smaller operational addresses in different wallets can add all of them as watch-only in Rabby on their personal device. Rabby then shows a unified portfolio view, eliminating the need to switch between multiple wallet applications or manually track balances. The blockchain wallet observation is centralized, while actual transaction signing remains distributed across the appropriate devices for each address.

The transaction simulation feature becomes especially valuable in these workflows. Before any signer approves a transaction, the portfolio manager or investor can preview it in Rabby, confirm that it matches the intended action, and catch obvious errors such as wrong destination addresses or unusual contract interactions. This “check before sign” discipline reduces the incident rate significantly, particularly in setups where signers are busy or less experienced with on-chain interactions.

Security considerations specific to watch-only setups

Because watch-only accounts cannot sign transactions, they inherit a different set of security considerations than private-key wallets. The primary threat is not theft of funds but rather information disclosure. An attacker gaining access to a watch-only setup learns which addresses are being monitored, their balances, and their transaction history. For a custodian managing client assets, this disclosure could be material. For an institutional investor with position information, it could be competitively sensitive.

Protection therefore focuses on access control and data isolation. A watch-only Rabby instance should run on a device with strong operating-system authentication (password or biometric), not on a shared workstation. If the device is lost or stolen, the attacker gains the address list but not the private keys, so funds remain secure. However, the visibility into holdings is compromised. For sensitive setups, consider using a dedicated, air-gapped device for watch-only monitoring—one that never connects to the internet except through a controlled, monitored link.

Browser extension security is a secondary consideration. Malicious browser extensions can inject code into pages, capture data, or modify transaction information before it reaches the wallet. Verify that the Rabby wallet extension is installed from the official source (the Rabby website or official app store) and that the version number matches the latest release. Browser extension permissions should be reviewed: Rabby needs permission to access blockchain data but should not require permission to access unrelated sites or stored passwords.

Browser extension standards now require that extensions from Firefox, Chrome, and Chromium-based browsers undergo security review before distribution. This process reduces (but does not eliminate) the risk of malicious software being included. Users should still verify that they are downloading from official sources and that the version installed matches the publicly documented release.