Was the Mayor of New York City laundering money through Signature Bank with NYCCoin? Signature Bank Faced Criminal Probe Ahead of Firm’s Collapse https://www.bloomberg.com/news/articles/2023-03-15/signature-bank-faced-crim... US prosecutors were investigating Signature Bank (SBNY)’s work with crypto clients before regulators suddenly seized the lender this past weekend, according to people familiar with the matter.