1. A method of model checking a first circuit model comprising: receiving a request from a user for a model check of the first circuit model; responsive to receiving the user request, simulating the first circuit model to generate simulation results; hashing the first circuit model simulation results to generate a hash index; comparing the hash index to a database of prior hash indices generated from hashed simulation results of prior circuit models to determine whether the first circuit model hash index matches a prior hash index of any of the prior circuit models to identify a matching prior circuit model; upon a positive match, determining whether the first circuit model is equivalent to the matching prior circuit model; and upon a positive determination of equivalence, providing prior test results of the matching prior circuit model to the user.