The field of digital forensic in the Internet of Things (IoT) has seen limited research in recent times. The expanding and unpredictable nature of IoT environments poses challenges for existing forensic tools, methods, and investigative models. This situation creates difficulties for law enforcement and forensic experts. To address these types of issues, this methodology proposes a blockchain dependent digital forensics solution for IoT surroundings. In this suggested framework, all IoT system communications are kept in form of blockchain transactions and this facilitating the formation of a robust and straightforward chain of custody mechanism. The usage of blockchain technique confirms the validity of data for analysis, enhances security, and improves the trustworthiness of integrity preservation through a decentralized approach. Additionally, the availability of public distributed records allows forensic investigation team members, including various device users, service providers, manufacturers, and investigators, to conduct transparent inquiries. To validate the concept, an analysis of the proposed framework was performed.