  The integration of blockchain technology with the Internet of Things (IoT)
presents a promising solution to enhance data security, integrity, and trust
within IoT ecosystems. However, the immutable nature of blockchain technology
conflicts with data redaction requirements mandated by data protection laws.
This paper provides a comprehensive review of the current state of redactable
blockchains and redaction mechanisms, particularly focusing on their
application within IoT contexts. Through an extensive review of existing
literature, this paper identifies key challenges and opportunities in
implementing redactable blockchains for IoT data management. Various redaction
mechanisms are explored, and the paper examines IoT implementations and use
cases where redactable blockchains are employed to address data protection
concerns.
