To increase the level of safety, precision, and openness of narrow-band IoT combined with blockchain. NB- IoT revolutionizes seamless connectivity for IoT devices in 3Gpp released 15, enabling long battery life and widespread coverage, its low-power consumption, enhanced penetration capabilities, promising a scalable and robust infrastructure for the future with integration of Blockchain technology presents a decentralized, immutable ledger system that ensures transparent and secure transactions across various industries, fostering trust without intermediaries and reducing fraud risks significantly. Its cryptographic principles and distributed nature empower industries by enabling traceability, enhancing data integrity, and revolutionizing traditional processes of supply chain management, our approach provides distributed data authentication while simultaneously creating a layer-based blockchain with NB- IoT proposing in this paper 16 QAM OFDM modulation technique optimizing Bit Error rate (BER), Symbol Error rate (SER), and Frame Error rate (FER) signal to noise ratio (SNR) at the maximum power of 25db using MAT Lab simulation graphical results in multi-layer, double-layer, and single-layer. Our mathematical model for optimizing business activities carried out at every stage of the intelligent supply chain facilitates revenue sharing among the entities of producers, distributors, and re-sellers who make up the proposed blockchain system and NB-IoT as it incorporates with additional traceability and review functions, it is the optimal solution for safe transportation of intelligent supply chain management.