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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.

Double spending is one of the central problems in digital currency design. Without a central clearing authority, the network must find a way to ensure that the same funds cannot be spent twice, which is achieved through consensus rules, timestamps, and the public broadcast of every valid transaction to all participating nodes.

Open source licences define how code may be used, modified, and redistributed. Permissive licences such as MIT impose relatively few conditions, while copyleft licences such as the GPL require derivative works to be released under the same terms, so teams need to check compatibility before adopting a dependency.

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.