Blockchain technology is a decentralized digital ledger that records transactions securely, transparently, and permanently. While it has transformed finance, supply chains, healthcare, and governance, its widespread adoption raises significant ethical concerns that must be addressed through responsible research and innovation. One major ethical implication is privacy. Although blockchain provides transparency, public blockchains make transaction records visible to all participants. Even when personal identities are hidden through cryptographic addresses, advanced data analysis may reveal user identities, creating risks to individual privacy and confidentiality. Another concern is data permanence. Information recorded on most blockchains cannot be easily altered or deleted. While this ensures integrity and trust, it may conflict with ethical and legal principles such as the right to correct or erase personal data. Researchers and developers must carefully decide what information