Bachhav , M., Kale, A. S., Daule , S. S., & Bikkad , P. D. (2025). Payoff: Secure Offline Payment System using Bluetooth and Block-Chain. International Journal of Recent Advances in Engineering and Technology, 14(1s), 226–228. https://doi.org/10.65521/intjournalrecadvengtech.v14i1s.280