An example apparatus may include a processor and a memory device including computer program code. The memory device and the computer program code may, with the processor, cause the apparatus to provide modified serialization codes for a first entity in a serialization flow to replace existing serialization codes for the first entity. In various examples, the modified serialization codes may have a representation of at least two different characters, and a number of instances of one of the characters in the representation of the modified serialization codes may be different from a number of instances of the one of the characters in the representation of the existing serialization codes. The memory device and the computer program code may further cause the apparatus to receive serialization codes from a second entity, the second entity being downstream in the serialization flow from the first entity; compare serialization codes from the second entity with the modified serialization codes; and verify the serialization codes from the second entity by determining if the serialization codes from the second entity are compatible with the modified serialization codes.