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Software supply chain security has drawn increasing attention in recent years. Once a malicious change is introduced into a widely used dependency, the impact can spread across a large number of downstream projects, which is why version pinning and source verification matter.

A cold wallet is any storage method kept entirely offline, such as a hardware device or a paper backup. The idea is to separate the private keys from any networked machine, so a remote attacker cannot simply steal them over the internet. For long-term holdings, keeping the bulk of funds in cold storage and only a working balance in a hot wallet is a common risk-management pattern.

A blockchain is fundamentally a distributed ledger. Transactions are grouped into blocks, and each block is cryptographically linked to the one before it, which makes historical records extremely difficult to alter after the fact. Instead of a single administrator holding write access, the ledger is replicated across many independent nodes, and every transfer must be agreed upon by the network's consensus rules before it becomes final.

Crypto wallets fall into two broad categories: custodial and non-custodial. A custodial wallet is operated by a service that holds the private keys on the user's behalf, which is convenient but requires trusting that operator. A non-custodial wallet returns control of the keys to the user, which removes counterparty risk but also means that a lost recovery phrase cannot be restored by anyone.