Abstract: A Network Function Virtualization Infrastructure (NFVI) executes Virtual Network Functions (VNFs) to transfer the VNF boot data to a distributed ledger. The distributed ledger performs a distributed ledger transaction with the VNF boot data to commit the VNF boot data to distributed ledger memory in a blockchain format. The NFVI executes the network VNF to deliver a network communication service. The NFVI loses VNF boot functionality and transfers a VNF boot request to the distributed ledger. The distributed ledger performs a distributed ledger transaction with the VNF boot request and the VNF boot data to transfer VNF recovery data to the NFVI and to commit the VNF boot request and the VNF recovery data to the distributed ledger memory in the blockchain format. The NFVI processes the VNF recovery data to recover the VNF boot functionality. The NFVI executes the recovered VNF to deliver the network communication service.