Our take
Tangem
Tangem offers a distinctive approach to cold storage by packaging a secure element into a durable bank card form factor. Founded in Switzerland in 2017, the company designed its hardware without internal batteries, charging ports, or connecting cables. Users interact with their digital assets by tapping the smart card against an NFC-enabled mobile phone running the companion application. The architecture stands out for offering a seedless recovery model alongside traditional BIP39 mnemonic passphrases. When configured without a seed phrase, the private key is generated directly inside the secure element and cloned securely across companion backup cards. This setup removes the risk of exposing paper backups to theft, though transaction validation relies on the paired smartphone screen. Tangem delivers practical and highly portable self custody for everyday cryptocurrency holders.
Unchained Capital
Unchained Capital delivers an institutional grade architecture tailored around Bitcoin native sovereignty. By employing an on chain 2 of 3 collaborative custody vault structure, the platform removes single points of failure without leaving users isolated. The customer holds two hardware keys directly, giving them mathematical sovereignty over their funds at all times, while Unchained holds a single key to assist with co signing transactions, technical recovery, and estate planning workflows. This arrangement effectively bridges sovereign cold storage with managed enterprise infrastructure.
While Unchained eliminates third party commingling risks common to centralized exchanges, it requires disciplined operational hygiene. Setting up hardware devices and coordinating quorum signatures demands deliberate effort, and fees on the entry level trading tier are noticeably higher than spot market exchanges. For long term Bitcoin holders, family offices, and self directed retirement accounts, Unchained provides a balanced, resilient custody model.