there is no confirmed black hole that has been identified as the closest to our solar system. Black holes are notoriously challenging to detect directly unless they are actively accreting matter from a nearby star or are involved in strong gravitational interactions with other objects.
However, it is worth mentioning that astronomers have discovered a few stellar-mass black hole candidates relatively close to us. One notable example is a black hole called MAXI J1820+070, which was discovered in 2018. It is estimated to be located about 10,000 light-years away from Earth. Another candidate, known as V616 Monocerotis (also referred to as A0620-00), is thought to be around 3,000 light-years away.
These distances may still seem quite far in astronomical terms, but they are considered relatively close considering the vastness of our galaxy, the Milky Way. It's important to note that the field of black hole research is dynamic, and new discoveries can emerge that may update our understanding of the closest known black holes to our solar system.