bitcoinj  (†835)"Understanding the bitcoinj security model" (bitcoinj.github, 2017).
- simplified payment verification (SPV) node (para.4): In this mode, only transactions that are relevant to the wallet are stored. Every other transaction is thrown away or simply never downloaded to start with. The block chain is still used and broadcast transactions are still received, but those transactions are not and cannot be checked to ensure they are valid. (†2201)