A system, method, and computer program product are provided for verifying virtual network function (VNF) package and/or network service definition integrity. In use, a system identifies a virtual network function package or a network service definition for performing integrity verification. The system computes a unique identifier of the VNF package or the network service definition that allows verification of an integrity of the VNF package or the network service definition. The system stores the unique identifier in a blockchain or a shared database. The system provides the VNF package or the network service definition to an entity such that the entity is capable of verifying the integrity of the VNF package or the network service definition by using the unique identifier of the VNF package or the network service definition from the blockchain or the shared database.