Seems like it might be evidence to support a habeas corpus petition. You should speak to an experienced criminal appellate lawyer.
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Retain a criminal lawyer who can handle the appellate process, more details are needed, but it would seem that you have a challenge to the conviction, good luck.
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So there was a bench trial?
I certainly sympathize with your concern.
Without reading the dueling declarations, it is hard to really say if the judge made a mistake. However, it seems like the judge certainly did exercise his discretion in deeming the witness was reliable and credible. I trust the two declarations were available to you or your counsel and there are good arguments that the judge abused his discretion.