A related question - is there an official job registry in the USA? That is would the gap be known about from public record, or is it up to you whether to speci

A related question - is there an official job registry in the USA? That is would the gap be known about from public record, or is it up to you whether to specify it in your CV or not? Also, how would you put the "tried a startup, failed" unemployment period into the CV?