As much as managing money is a part of our life, we are also more worried about security and safety. Blockchain tech is new but is efficient and able to drive expectations that it could lead to a new generation of applications. Essentially, blockchain is dependent on technology that encrypts digital data transfer. The success of any cryptocurrency lies in ensuring the privacy of the users and their transactions. The underlying data structure of the blockchain which supports scalability and security relies on hash functions. The hash function used by a blockchain to secure its operations can be tested against security criteria to evaluate its security. This text depicts the key elements of blockchain technology. In addition, it offers a short description of hash functions like Whirlpool, MD (Message Digest), RIPEMD, SHA (Secure Hash Algorithm), and BLAKE. The study comes to a conclusion after comparing the results. The simulation result shows that various cryptographic hash algorithms yield good results for different evaluation metrics such as frequency, throughput… etc.