1 INTRODUCTION  
2 FEDERATED LEARNING, BLOCKCHAIN, AND BLOCKFL  
2.1 FL  
2.2 Blockchain  
2.3 BlockFL  
3 APPLICATIONS OF BLOCKFL IN IOT  
4 SECURITY AND PRIVACY OF BLOCKFL FOR IOT  
5 TRUST AND RELIABILITY OF BLOCKFL FOR IOT  
6 EFFICIENCY OF BLOCKFL FOR IOT  
7 DATA HETEROGENEITY OF BLOCKFL FOR IOT  
8 LESSONS LEARNED AND OPEN CHALLENGES OF BLOCKFL FOR IOT  
9 CONCLUSION AND FUTURE WORK