I. INTRODUCTION  
II. OUR WORK AND EXISTING SURVEYS  
III. SMART ENVIRONMENTS  
IV. BLOCKCHAIN AND ITS APPLICATIONS  
V. BLOCKCHAIN & INTERNET OF THINGS (IOT)  
VI. BLOCKCHAIN & CLOUD, FOG, AND EDGE COMPUTING  
VII. BLOCKCHAIN & SOFTWARE-DEFINED NETWORKING (SDN)  
VIII. BLOCKCHAIN & ARTIFICIAL INTELLIGENCE (AI)  
IX. OPEN RESEARCH PROBLEMS  
X. DISCUSSION AND CONCLUSION