Simple Payment Verification (SPV) allows lightweight clients to verify transactions without downloading the entire blockchain. Instead of maintaining a full node, which requires significant storage and processing power, SPV clients only download block headers. Each header contains essential information, such as the timestamp, the previous block’s hash, and a Merkle root.When a user wants to confirm a transaction, the SPV client requests proof from full nodes. This proof includes a Merkle proof, which verifies that the transaction is included in a specific block without needing the complete block data.SPV is particularly useful for mobile and lightweight applications, as it enables users to send and receive funds without the overhead of full node operation. While it offers convenience, it does come with some concerns regarding security and trust, as SPV clients rely on full nodes for transaction validation. Overall, SPV strikes a balance between efficiency and usability, making it accessible for everyday users.
