In an example implementation according to aspects of the present disclosure, a system comprising a memory, a storage medium, and a processor communicatively coupled to both the memory and the storage medium. The system receives a lifecycle change event, wherein the lifecycle change event corresponds to a component change in a unit. The system updates a first distributed cryptographic ledger with a first entry corresponding to the component indicating the lifecycle change. The system updates a second distributed cryptographic ledger with a second entry corresponding to the unit indicating the lifecycle change. The system transmits the first entry and the second entry to a plurality of nodes, wherein the nodes validate the first entry and the second entry.