OneKey Founder Outlines Hardware Standards for iPhone Cold Wallets

Yishi, the founder of the hardware wallet provider OneKey, has released a series of security recommendations for users looking to repurpose Apple smartphones as cold storage devices. The guidance emphasizes that while an iPhone can be technically modified into a cold wallet to manage digital assets like Bitcoin (BTC) or Ethereum (ETH), strict hardware and software requirements are necessary to mitigate potential vulnerabilities. The founder specifically pointed toward future hardware iterations to ensure the highest level of cryptographic security.

Hardware and Software Requirements for Cold Storage

To ensure maximum protection against unauthorized access, Yishi suggests a minimum hardware standard of the iPhone 17 or newer models. From a software perspective, the devices should ideally run iOS 27 or higher to benefit from the latest security patches and kernel protections. These recommendations are rooted in the evolving nature of mobile security architectures, specifically regarding the Secure Enclave—a dedicated hardware-based key manager isolated from the main processor.

• Minimum Hardware: iPhone 17 and above.
• Software Version: iOS 27 or higher.
• Replacement Cycle: Devices should be rotated every 1 to 2 years to prevent hardware degradation and long-term physical exploits.

Addressing Physical Security Risks

A primary concern in the modification of mobile devices for cold storage is the risk of physical compromise. Yishi noted that older devices, even when kept entirely offline (Air-gapped), cannot fully eliminate the threats associated with a malicious actor gaining physical possession of the hardware. Cold wallets are designed to keep private keys offline, but physical access to the device remains a significant attack vector for sophisticated bad actors.

"These are personal security recommendations and not official Apple certifications or security guarantees", Yishi clarified, emphasizing that these guidelines reflect individual expertise rather than a formal endorsement from the manufacturer.

The discussion highlights the ongoing shift in the cryptocurrency industry toward utilizing existing high-end mobile hardware for asset management. However, experts continue to stress that while modified iPhones offer a high degree of utility, they must be managed with a disciplined approach to updates and physical environment controls to effectively safeguard blockchain assets. Users are encouraged to weigh these custom setups against purpose-built hardware wallets that lack the broad attack surface of a multifunctional smartphone.