The IRS is intensifying its scrutiny of cryptocurrency users by requiring them to disclose their history with over 100 exchanges and wallets in certain tax audits. The list includes major platforms such as Coinbase, Binance, Kraken, FTX, and Mt. Gox, as well as self-custody wallets like MetaMask, Ledger, and Trezor. Taxpayers must indicate their usage of these platforms and sign the document to confirm their disclosures.