Bachhav M, Kale AS, Daule SS, Bikkad PD. Payoff: Secure Offline Payment System using Bluetooth and Block-Chain. IJRAET [Internet]. 2025 May 2 [cited 2025 Oct. 27];14(1s):226-8. Available from: https://journals.mriindia.com/index.php/ijraet/article/view/280