A timestamp is a small piece of data stored in each block on a blockchain that indicates the exact moment it was created. It is used to ensure the immutability and authenticity of blockchain data. By 2025, blockchain timestamps have evolved significantly, achieving microsecond-level precision through quantum clock synchronization. The Universal Blockchain Time Protocol (UBTP) has standardized timestamps across 85% of blockchain platforms, enhancing cross-chain interoperability and reducing verification times by 67%. Advanced security measures, including temporal oracles and multi-layered verification, have made time warp attacks computationally unfeasible. These advancements have expanded the application of blockchain timestamps in legal evidence certification, financial settlements, and supply chain transparency, while also achieving unprecedented integration with international time standards.