in an artificial general intelligence system that is safe for humans, distributed ledger technology (DLT, ‘blockchain’) is integral to the methods to reduce the probability of hacking, provide an audit trail to cheaply detect and correct errors or identify components causing vulnerability or failure and replace them or shut them down remotely and/or automatically. Smart contracts based on DLT are necessary to address evolution of AI that will be too fast for human monitoring and intervention. Proposed methods of a safe AGI system: 1) Access to technology by market license. 2) Transparent ethics embodied in DLT. 3) Morality encrypted via DLT. 4) Behavior control structure with values (ethics) at roots. 5) Individual bar-code identification of all critical components. 6) Configuration Item (from business continuity/disaster recovery planning). 7) Identity verification secured via multi-factor authentication and DLT. 8) ‘Smart’ automated contracts based on DLT. 9) Decentralized applications—AI software code modules encrypted via DLT. 10) Audit trail of component usage stored via DLT. 11) Social ostracism (denial of societal resources) augmented by DLT petitions.