In different areas such as the financial field, supply chain management, and healthcare are moving to a new technology to manage their own business in a secured and decentralized way by using the blockchain. Basically, it is a particular type of distributed ledger technology which is a protocol that allows the transactions to be distributed and validated among peers in a synchronized way and to be recorded. Once these transactions are recorded, they cannot be changed or spoofed. Due to these features, blockchain is being used in the validation and proofing of presence of an object. Proof of presence means to know whether a person or an object was in a certain time at a certain position.