According to CoinMeta, a blockchain detective known as Zachxbt reported that an American scammer named Tiffany Milanovich stole over 5 million US dollars in cryptocurrency by impersonating the customer service of hardware wallets and centralized exchanges. In one attack, Milanovich pretended to be email support from BitcoinIRA and transferred approximately 1.2 million US dollars in BTC from the victim Trezor's wallet. In another case, they stole around 500,000 US dollars in BTC from the account of Coinbase.