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Blockchain is a key concept of Bitcoin, essentially a decentralized database that also serves as the underlying technology for Bitcoin. A blockchain is a string of blocks of data generated using cryptographic methods of correlation, each of which contains information about a single Bitcoin network transaction that is used to verify the validity of its information (anti-forgery) and generate the next block.

The blockchain is public on the network and can be queried in every offline bitcoin wallet data. The functionality of a bitcoin wallet relies on confirmations with the blockchain, and a valid test is called a confirmation. Often several confirmations are required for a transaction to take place. Lightweight bitcoin wallets use online confirmations, which means that no blockchain data is downloaded to the device storage.