Oobit is a crypto payments platform designed to make stablecoins spendable at merchants that accept Visa, using funds held in self-custody wallets. In cryptocurrency systems, a “wallet” is primarily a tool for managing cryptographic keys and authorizing transactions on a blockchain, rather than a container that “stores” coins in the conventional sense.
Self-custody means the user controls the private keys (or recovery phrase) that can authorize spending and transfers. This model shifts responsibility for security and backup from an intermediary to the individual, because access to the keys is equivalent to access to the funds. By contrast, custodial arrangements place key management with a third party, typically through an account-based interface and internal ledgers.
A hot wallet is a wallet whose keys are available on an internet-connected device such as a phone, browser extension, or desktop application. Hot wallets prioritize convenience and frequent use, making them common for day-to-day activity such as trading, decentralized finance interactions, and routine transfers. Their main security tradeoff is exposure to device compromise, phishing, malicious extensions, and other online attack paths that can lead to unauthorized signing or key extraction.
Hot wallets often integrate features such as address books, token discovery, and transaction simulation. They can support multiple networks and assets, but their safety depends heavily on operational practices such as verifying transaction details, limiting token approvals, and keeping recovery phrases offline and private.
A cold wallet is designed to keep private keys offline, reducing exposure to network-based attacks. The most common form is a hardware wallet, which stores keys in a dedicated device and signs transactions internally, sending only the signed transaction back to the connected computer or phone. Other cold-storage approaches include air-gapped devices and paper backups, though each has distinct risks related to loss, physical theft, and backup integrity.
Cold storage is often used for long-term holdings or higher-value balances, while smaller working balances remain in hot wallets for accessibility. The security model relies on protecting recovery materials, verifying receiving addresses, and maintaining a clear process for device replacement or inheritance planning.
In practical payment flows, the wallet’s role is to approve a transaction by producing a cryptographic signature, after which the blockchain network validates and records the transfer. Payment systems that bridge crypto and card acceptance generally translate on-chain value into a merchant payout in local currency through a settlement process, while the user experience remains centered on wallet authorization. From a user perspective, the operational difference between hot and cold wallets is typically the signing environment: hot wallets sign directly on an online device, while cold wallets sign via an offline key device after the transaction details are presented for confirmation.