Family and local community historians have always made use of criminal justice records. Increasingly available as digital files, these documents are accessible to anyone with access to an internet-linked computer or even smartphone. In many cases, the fragmented nature of these records means their richness remains a potential rather than reality. The Prosecution Project1 links these records as a large-scale Australian exercise in unlocking the criminal justice records of all the states. We seek to digitise and eventually make publicly accessible the records of the criminal courts, documenting not only the names of the accused but of magistrates, judges, lawyers, police and victims and other witnesses. The project is a significant collaboration between university researchers and a large and growing community of volunteers. This paper outlines what the project is doing, how we are doing it and illustrates its potential use for family and local historians interested in Australia's past.