This chapter introduces the integration of wireless body sensor networks (WBSNs) with cloud computing in healthcare, highlighting the challenges in ensuring patient data privacy and security. Traditional sensor-cloud infrastructure (S-CI) architectures, which rely on a single trusted authority (TA), struggle to address issues such as access control, scalability, privacy, and data confidentiality. Recognizing these challenges, blockchain technology has emerged as a promising solution, offering robust security measures. The study proposes a comprehensive blockchain-based system, including an innovative Blockchain-Based Access Control Model (BBACM), to enhance the privacy and security of patient data. The BBACM effectively manages authorization rights for accessing patient physiological parameters (PPPs) and personal health information (PHI). A real-world use case involving a paralyzed patient demonstrates the effectiveness of the BBACM, showing improvements in fine-grained access control, security, privacy, scalability, and availability of PHI. The decentralized and tamper-resistant nature of blockchain provides a robust framework for addressing the challenges in S-CI, offering a secure and privacy-preserving solution for healthcare data management.This chapter introduces the integration of wireless body sensor networks (WBSNs) with cloud computing in healthcare, highlighting the challenges in ensuring patient data privacy and security. Traditional sensor-cloud infrastructure (S-CI) architectures, which rely on a single trusted authority (TA), struggle to address issues such as access control, scalability, privacy, and data confidentiality. Recognizing these challenges, blockchain technology has emerged as a promising solution, offering robust security measures. The study proposes a comprehensive blockchain-based system, including an innovative Blockchain-Based Access Control Model (BBACM), to enhance the privacy and security of patient data. The BBACM effectively manages authorization rights for accessing patient physiological parameters (PPPs) and personal health information (PHI). A real-world use case involving a paralyzed patient demonstrates the effectiveness of the BBACM, showing improvements in fine-grained access control, security, privacy, scalability, and availability of PHI. The decentralized and tamper-resistant nature of blockchain provides a robust framework for addressing the challenges in S-CI, offering a secure and privacy-preserving solution for healthcare data management.