Mark Moss lost Bitcoin three different ways: 27 BTC in a Bittrex exchange hack, 40 BTC when his phone wallet got compromised in 2017, and access to his Trezor after losing the backup seed phrase. He shows how losses can happen on exchanges, hot wallets, and cold storage.
I've lost a lot of Bitcoin on exchanges. 27 Bitcoin got hacked off of Bittrex. I had $40,000 worth of Bitcoin USD in 2017, so that was 40 Bitcoin taken out of a hot wallet on my phone. I had a Trezor that updated, and when I plugged it in, I had to download the new firmware, but I couldn't find the backup seed phrase for it. So you can lose on a hot wallet, you can lose on exchange, and you can lose on a cold wallet because I've done all 3. Okay, I've done all 3.
