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The increased deployment of Internet of Things (IoT) devices will make them targets for attacks. IoT devices can also be used as tools for committing crimes. In this regard, we propose FIF-IoT - a forensic investigation framework using a public digital ledger to find facts in criminal incidents in IoT-based systems. FIF-IoT collects interactions that take place among various IoT entities (clouds, users, and IoT devices) as evidence and store them securely as transactions in a public, distributed and decentralized blockchain network which is similar to the Bitcoin network. Hence, FIF-IoT eliminates a single entity's control over the evidence storage, avoids single-point-offailure on the storage media, and ensures high availability of evidence. FIF-IoT presents a framework that ensures integrity, confidentiality, anonymity, and non-repudiation of the evidence stored in the public digital ledger. Furthermore, FIF-IoT provides a …