The recent Coldcard security incident is a reminder that wallet hygiene involves more than choosing a reputable hardware wallet. In late July 2026, researchers identified a flaw in certain Coldcard firmware that reduced the randomness used when generating wallet seeds, potentially allowing attackers to reconstruct vulnerable seeds and access associated bitcoin. Coinkite subsequently released fixed firmware across affected product lines and advised users with seeds generated on vulnerable firmware to create new seeds and migrate their funds. Importantly, updating the firmware alone does not repair a seed that was already generated with insufficient entropy.

The incident highlights an important distinction for digital asset investors: A hardware wallet is a security tool, not a complete security strategy. Strong custody also depends on how private keys and seed phrases are generated, how backups are stored, which devices and applications interact with a wallet, and how capital moves between wallets, exchanges and other platforms.

What Is Wallet Hygiene?

Wallet hygiene is the set of practices investors use to limit unnecessary exposure and maintain control over their digital assets. In plain terms, it means knowing what each wallet is designed to do, where assets are held and what risks each wallet is exposed to.

That process begins with seed security. Seed phrases should be generated using trusted hardware and kept offline in a secure backup. They should not be stored in screenshots, cloud drives, email accounts, messaging applications or other internet-connected environments. Investors using applications and decentralized finance protocols should also periodically review wallet activity and smart contract permissions, removing approvals that are no longer necessary.

Just as important is segregation. A wallet used to interact frequently with decentralized applications should not necessarily hold the same assets as a wallet intended for long-term storage. Separating functions can reduce the potential impact of a compromised device, malicious application, exposed seed or mistaken transaction.

A Three-Tier Approach to Crypto Custody

One practical approach to wallet hygiene is to divide digital asset storage into three broad tiers: cold storage, hot wallets and exchange accounts.

Cold storage is generally suited to long-term holdings that do not need to move frequently. Hardware wallets and institutional-grade cold-storage systems are designed to keep private keys isolated from internet-connected environments. The objective is to reduce the number of opportunities for those keys to be exposed.

Hot wallets are connected to phones, computers or browser-based applications and are commonly used for active on-chain activity, including trading, staking and decentralized finance. That convenience comes with additional exposure. Hot wallets may interact with smart contracts, browser extensions and third-party applications, so investors may want to limit balances to amounts appropriate for their intended activity and risk tolerance.

Exchange accounts provide trading liquidity, asset conversion and access to fiat payment rails. They serve a different purpose from self-custody wallets. Assets held through a centralized exchange are controlled through the exchange’s custody infrastructure, meaning customers depend on that platform’s security, operating policies and ability to process withdrawals.

Under a tiered model, capital moves between these environments deliberately. Long-term holdings can remain in cold storage, funds needed for on-chain activity can move to a designated hot wallet, and exchange balances can be limited to capital needed for trading or conversion. When activity is complete, excess balances can be moved back to an appropriate storage tier.

Custody Is About Managing Different Types of Risk

The case for limiting unnecessary exchange balances is primarily about managing counterparty and access risk. Centralized platforms can provide significant benefits, including liquidity, convenience and professional custody infrastructure. At the same time, users do not directly control the private keys associated with assets held through most exchange accounts.

Security incidents, operational disruptions, regulatory actions, liquidity problems or platform-specific restrictions can affect a customer’s ability to trade or withdraw assets. Self-custody reduces some of those dependencies, but it introduces a different set of responsibilities, including seed management, device security, transaction verification and backup procedures.

The Coldcard incident illustrates that trade-off. Hardware wallets can significantly reduce certain attack surfaces, but hardware alone cannot eliminate software risk or operational mistakes. Block’s security researchers found that affected Coldcard firmware could produce substantially less entropy than intended, while Coinkite has advised affected users to migrate to newly generated seeds after installing fixed firmware.

For investors, the broader lesson is not that hardware wallets have failed or that one custody model is universally superior. It is that custody should be treated as a system of controls rather than a single product decision.

Strong wallet hygiene means reducing single points of failure, separating long-term holdings from higher-risk activity, keeping seed material securely offline and periodically reviewing the security assumptions behind each part of a custody setup. As digital asset infrastructure evolves, those practices can help investors manage the different risks that come with both self-custody and third-party platforms.

Disclosures: This article is for informational purposes only and should not be considered financial, legal, tax, or investment advice. It provides general information on cryptocurrency without accounting for individual circumstances. Sarson Funds, Inc. does not offer legal, tax, or accounting advice. Readers should consult qualified professionals before making any financial decisions. Cryptocurrency investments are volatile and carry significant risk, including potential loss of principal. Past performance is not indicative of future results. The views expressed are those of the author and do not necessarily reflect those of Sarson Funds, Inc. By using this information, you agree that Sarson Funds, Inc. is not liable for any losses or damages resulting from its use.